CN108304894A - The method of RFID tag and processing radiofrequency signal - Google Patents

Abstract

A kind of method of radio frequency identification (RFID) labels and processing radiofrequency signal, can improve the downlink communication distance of RFID system especially passive RFID system.The RFID tag includes：Receiving unit, the first radiofrequency signal for receiving RFID reader transmission；Extraction unit, the first radiofrequency signal for receiving the receiving unit output, and processing is extracted to first radiofrequency signal, obtain first baseband envelope signal；First amplifying unit, the first baseband envelope signal for receiving the extraction unit output, and processing is amplified to first baseband envelope signal, obtain the second baseband envelope signal；Converting unit, second baseband envelope signal for receiving the first amplifying unit output, and conversion process is carried out to second baseband envelope signal, obtain the first baseband digital signal.

Description

Radio frequency identification tag and method of processing radio frequency signals

technical field

The present invention relates to the field of communications, and more particularly, to radio frequency identification tags and methods of processing radio frequency signals.

Background technique

Radio Frequency Identification (RFID) technology automatically identifies target objects and obtains relevant data through radio frequency signals. The identification work does not require manual intervention and can work in various harsh environments. Generally, an RFID system may include RFID readers and RFID tags. According to the energy source of RFID tags, RFID tags can be divided into active RFID tags and passive RFID tags. The working principle of the passive RFID tag is as follows: After the passive RFID tag enters the magnetic field of the RFID reader, it can receive the radio frequency signal sent by the RFID reader, and transmit the energy stored in the RFID tag by virtue of the energy obtained by the induced current. product information. Due to the lower power consumption and cost of passive RFID tags, they are widely used in the field of Internet of Things.

Due to the limited energy of passive RFID tags, the downlink communication distance of passive RFID systems is generally limited by the demodulation capability of RFID tags. At present, the communication distance of passive RFID systems is within 20m without interference from obstructions. Therefore, how to increase the downlink communication distance of RFID systems, especially passive RFID systems, is an urgent problem to be solved in this field.

Contents of the invention

Embodiments of the present invention provide an RFID tag and a method for processing radio frequency signals, which are beneficial to improving the downlink communication distance of an RFID system, especially a passive RFID system.

In the first aspect, an RFID tag is provided, including: a receiving unit, configured to receive a first radio frequency signal sent by an RFID reader; an extraction unit, configured to receive the first radio frequency signal output by the receiving unit, and A radio frequency signal is extracted and processed to obtain the first baseband envelope signal; the first amplifying unit is configured to receive the first baseband envelope signal output by the extraction unit, and perform amplification processing on the first baseband envelope signal to obtain a second baseband envelope signal; a conversion unit, configured to receive the second baseband envelope signal output by the first amplifying unit, and perform conversion processing on the second baseband envelope signal to obtain a first baseband digital signal.

Optionally, the first amplifying unit may be specifically configured to amplify the first baseband envelope signal according to an average voltage value of the first baseband envelope signal.

Optionally, the first amplifying unit may be specifically configured to amplify the voltage difference between the first baseband envelope signal and the ground voltage.

Optionally, the first amplifying unit may be specifically configured to amplify a voltage difference of the first baseband envelope signal relative to its average voltage.

In the RFID tag provided by the embodiment of the present invention, the extraction unit performs envelope extraction processing on the first radio frequency signal to obtain the first baseband envelope signal, and the first amplification unit performs amplification processing on the first baseband envelope signal to obtain the second For the baseband envelope signal, the conversion unit converts the second baseband envelope signal into a baseband digital signal, which can increase the communication distance between the RFID tag and the RFID reader, thereby improving the performance of the RFID system.

In a first possible implementation of the first aspect, the RFID tag further includes: an averaging unit, configured to receive the first baseband envelope signal output by the extraction unit, and determine the average voltage of the first baseband envelope signal value.

Optionally, the conversion unit is specifically configured to receive the average voltage output by the averaging unit, and perform conversion processing on the second baseband envelope signal according to the average voltage.

Optionally, the first amplifying unit may be specifically configured to receive the average voltage output from the averaging unit, and perform amplification processing on the first baseband envelope signal according to the received average voltage to obtain a second baseband envelope signal.

In a second possible implementation of the first aspect, the RFID tag further includes: a second amplification unit, configured to receive the average voltage output by the averaging unit, and perform amplification processing on the average voltage value to obtain the amplification processing the amplified average voltage; the conversion unit is specifically used to receive the amplified average voltage output from the second amplifying unit, and according to the amplified average voltage, the second baseband envelope The signal is converted.

At this time, optionally, the first method unit may be specifically configured to amplify the voltage difference between the first baseband envelope signal and the ground voltage.

With reference to the above possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the RFID tag further includes: a switch unit, wherein the conversion unit is specifically configured to When the switch unit is in the second state, the conversion unit is also used to receive the first baseband envelope signal output by the extraction unit.

Optionally, the switch unit can be used to bypass the first amplifying unit. Specifically, when the switch unit is in the first state, the converting unit may be connected to the extracting unit through the first amplifying unit, and the first amplifying unit may be in a working state; when the switching unit is in the second state, The converting unit may be connected to the extracting unit without passing through the first amplifying unit, for example, the converting unit may be directly connected to the extracting unit, and the first amplifying unit may be in a bypass state.

Optionally, when the switch unit is in the second state, the power of the first amplifying unit can be turned off, thereby saving the power consumption of the RFID tag.

Optionally, the RFID tag may also include a control unit for controlling the state of the switch unit.

Optionally, the switching unit includes: a first switching device connected in parallel with the first amplifying unit and a second switching device connected in series with the first amplifying unit, wherein, when the switching unit is in the first state, the first switching device A switch device is turned off, and the second switch device is turned on; when the switch unit is in the second state, the first switch device is turned on, and the second switch device is turned off.

Optionally, the first switching device may be connected in series with the amplifying device in the first amplifying unit and/or the power supply of the amplifying device, and the second switching device may be connected in series with the amplifying device in the first amplifying unit and/or the amplifier The power supplies of the components are connected in parallel.

With reference to the above possible implementation of the first aspect, in a fourth possible implementation of the first aspect, the RFID tag further includes: a counting unit, configured to receive the second baseband digital signal output by the conversion unit, and The second baseband digital signal is counted, wherein the second baseband digital signal is obtained by processing the second radio frequency signal or pilot frequency sent by the RFID reader; the control unit is used to receive the output of the counting unit The counting result, and according to the counting result, control the state of the switch unit.

Specifically, before receiving the first radio frequency signal, the receiving unit may also receive a pilot or a second radio frequency signal sent by the RFID reader. The pilot frequency or the second radio frequency signal may be sequentially processed by the extraction unit and the conversion unit to obtain a second baseband digital signal.

Optionally, the counting unit may be specifically configured to detect a slope of an analog waveform of the second baseband digital signal when level conversion occurs.

Optionally, the counting result of the counting unit may indicate the signal strength of the signal received by the RFID tag or the channel state between the RFID tag and the RFID reader. If the counting result of the counting unit indicates that the signal strength of the signal received by the RFID tag is larger or the channel state between the RFID tag and the RFID reader is better, then the switch unit can be in the second state; otherwise , the switch unit can be in the first state.

Optionally, if the slope of the analog waveform of the second baseband digital signal exceeds a threshold when the level transition occurs, the switch unit may be in the second state; otherwise, the switch unit may be in the first state.

With reference to the above possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the RFID tag further includes: a coupling unit, a voltage transforming unit, and a signal shaping unit, wherein the coupling unit is used to convert The first part of the signal to be coupled is coupled to the transformation unit, wherein the signal to be coupled is obtained according to the signal sent by the RFID reader; the transformation unit is used to receive the signal to be coupled output by the coupling unit The first part of the signal, and performing a voltage transformation process on the first part of the signal to be coupled to obtain the first part of the signal after the voltage transformation process; the signal shaping unit is used to receive the first part of the voltage transformation process output by the voltage transformation unit signal, and control the state of the switch unit according to the first part of the signal after the voltage transformation processing.

At this time, optionally, the control unit may include a voltage transformation unit and a signal shaping unit.

With reference to the foregoing possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the signal to be coupled is specifically a second radio frequency signal or a pilot frequency sent by the RFID reader-writer.

At this time, optionally, the coupling unit may also be configured to couple the second part of the signal to be coupled to the extraction unit.

Optionally, the coupling unit is also configured to receive the first radio frequency signal output by the receiving unit, couple the first part of the first radio frequency signal to the transformation unit, and couple the second part of the first radio frequency signal to the transformer unit. Part of the signal is coupled to the extraction unit; the extraction unit is specifically configured to receive a second part of the signal in the first radio frequency signal output by the coupling unit, and perform extraction processing on the second part of the signal in the first radio frequency signal to obtain The first baseband envelope signal.

With reference to the above possible implementation of the first aspect, in the seventh possible implementation of the first aspect, optionally, the signal to be coupled is specifically the baseband envelope of the second radio frequency signal sent by the RFID reader signal or the baseband envelope signal of the pilot sent by the RFID reader.

At this time, optionally, the coupling unit may also be used to couple the second part of the signal to be coupled to the first amplifying unit.

Optionally, the coupling unit is also configured to receive the first baseband envelope signal output by the extraction unit, couple the first part of the first baseband envelope signal to the transformation unit, and convert the first baseband envelope signal The second part of the signal in the envelope signal is coupled to the first amplifying unit; the first amplifying unit is specifically configured to receive the second part of the first baseband envelope signal output by the coupling unit, and to the first The second part of the baseband envelope signal is amplified to obtain the second baseband envelope signal.

With reference to the above-mentioned possible implementation of the first aspect, in an eighth possible implementation of the first aspect, the RFID further includes: a control unit, configured to perform demodulation processing based on the pilot frequency sent by the RFID reader-writer As a result, the state of the switching unit is controlled.

Optionally, the pilot may be a pilot specially designed for controlling the state of the switch unit, that is, a dedicated pilot.

Specifically, before receiving the first radio frequency signal, the receiving unit can also be used to receive the pilot frequency sent by the RFID reader, and the RFID tag can be in the first state and the second state of the switch unit respectively. Next, the received pilot is processed to obtain the first demodulation processing result and the second demodulation processing result, and the control unit can control the State of the switch unit.

In a second aspect, a method for processing radio frequency signals is provided, including: receiving a first radio frequency signal sent by an RFID reader; performing envelope extraction processing on the first radio frequency signal to obtain a first baseband envelope signal; The first baseband envelope signal is amplified to obtain a second baseband envelope signal; the second baseband envelope signal is converted to obtain a first baseband digital signal.

Optionally, the voltage difference of the first baseband envelope signal relative to its average voltage may be amplified, or the voltage difference of the first baseband envelope signal relative to the ground voltage may be amplified.

Optionally, before converting the second baseband envelope signal to obtain the first baseband digital signal, the method further includes: determining an average voltage of the first baseband envelope signal.

At this time, optionally, performing conversion processing on the second baseband envelope signal to obtain the first baseband digital signal includes: according to the voltage average value of the first baseband envelope signal, converting the second baseband envelope signal Perform conversion processing to obtain the first baseband digital signal.

Optionally, amplifying the first baseband envelope signal to obtain a second baseband envelope signal includes: amplifying the first baseband envelope signal according to the average voltage of the first baseband envelope signal processing to obtain the second baseband envelope signal.

Optionally, amplifying the first baseband envelope signal to obtain the second baseband envelope signal includes: amplifying a voltage difference between the first baseband envelope signal and the ground voltage.

At this time, optionally, before converting the second baseband envelope signal according to the average voltage value of the first baseband envelope signal, the method further includes: the voltage of the first baseband envelope signal The average value is amplified to obtain an amplified average voltage; the second baseband envelope signal is converted according to the average voltage of the first baseband envelope signal, including: according to the amplified voltage The average value is converted to the second baseband envelope signal.

In a first possible implementation manner of the second aspect, before performing the amplification processing on the first baseband envelope signal, the method further includes: determining to perform amplification processing on the first baseband envelope signal.

With reference to the first possible implementation of the second aspect, in a second possible implementation of the second aspect, the determining to amplify the first baseband envelope signal includes: according to the second baseband digital signal, Counting to obtain a counting result, wherein the second baseband digital signal is obtained by processing the signal sent by the RFID reader before sending the first radio frequency signal; according to the counting result, determine the first baseband The envelope signal is amplified.

With reference to the first possible implementation of the second aspect, in a third possible implementation of the second aspect, the determining to amplify the first baseband envelope signal includes: the first part of the signal to be coupled The signal is subjected to voltage transformation processing to obtain the first part of the signal after the voltage transformation processing, wherein the signal to be coupled is obtained according to the signal sent by the RFID reader before sending the first radio frequency signal; according to the signal after the voltage transformation processing For the first part of the signal, it is determined to perform amplification processing on the first baseband envelope signal.

Optionally, the signal to be coupled may be coupled to obtain a first part of the signal to be coupled and a second part of the signal to be coupled. Wherein, it may be determined whether to perform amplification processing on the first baseband envelope signal according to the first part of the signal to be coupled.

Optionally, the second part of the signal to be coupled may also be processed to obtain a baseband digital signal.

Optionally, the signal to be coupled is specifically a second radio frequency signal or a pilot frequency sent by the RFID reader before sending the first radio frequency signal.

With reference to the first possible implementation of the second aspect, in a fourth possible implementation of the second aspect, performing envelope extraction processing on the first radio frequency signal to obtain the first baseband envelope signal includes: : performing envelope extraction processing on the second part of the first radio frequency signal to obtain the first baseband envelope signal.

At this point, optionally, coupling processing may be performed on the first radio frequency signal to obtain a first part of the first radio frequency signal and a second part of the first radio frequency signal. The first baseband envelope signal is obtained by performing envelope extraction processing on the second part of the first radio frequency signal.

Optionally, the signal to be coupled is specifically the baseband envelope signal of the second radio frequency signal sent by the RFID reader before sending the first radio frequency signal or the baseband envelope signal sent by the RFID reader before sending the first radio frequency signal The baseband envelope signal of the pilot.

In combination with the first possible implementation of the second aspect, in a fifth possible implementation of the second aspect, the first baseband envelope signal is amplified to obtain a second baseband envelope signal, including: The second part of the first baseband envelope signal is amplified to obtain a second baseband envelope signal.

At this time, optionally, coupling processing may be performed on the first baseband envelope signal to obtain a first part of the first baseband envelope signal and a second part of the first baseband envelope signal. The second baseband envelope signal is obtained by amplifying the second part of the first baseband envelope signal.

With reference to the first possible implementation of the second aspect, in a sixth possible implementation of the second aspect, the determining to amplify the first baseband envelope signal includes: according to the RFID reader-writer As a result of the demodulation processing of the pilot sent before sending the first radio frequency signal, it is determined to perform amplification processing on the first baseband envelope signal.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the RFID system applied in the embodiment of the present invention.

Fig. 2 is a schematic block diagram of an RFID tag provided by an embodiment of the present invention.

Fig. 3 is a schematic block diagram of an RFID tag provided by an embodiment of the present invention.

Fig. 4 is another schematic block diagram of the RFID tag provided by the embodiment of the present invention.

Fig. 5 is another schematic block diagram of the RFID tag provided by the embodiment of the present invention.

Fig. 6 is a schematic block diagram of another RFID tag provided by an embodiment of the present invention.

Fig. 7 is a schematic block diagram of another RFID tag provided by an embodiment of the present invention.

Fig. 8 is a schematic diagram of a method for processing a radio frequency signal provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention.

FIG. 1 shows an example of the architecture of an RFID system 100 to which an embodiment of the present invention is applied. The RFID system 100 includes an RFID reader-writer 110 and an RFID tag 120, wherein the RFID reader-writer 110 and the RFID tag 120 can communicate through radio frequency (Radio Frequency, RF) signals. The RFID reader-writer 110 can transmit an inquiry RF signal, and the RFID tag 120 near the RFID reader-writer 110 can detect the inquiry RF signal sent by the RFID reader-writer 110, and return a response RF signal to the RFID reader-writer 110, Wherein, the response RF signal may carry the relevant information of the RFID tag 120 itself. The RFID reader/writer 110 can detect and interpret the response RF signal.

In the embodiment of the present invention, the RFID tag 120 may be an active tag or a passive tag. If the RFID tag 120 is a passive tag, that is, the RFID tag 120 does not have a power source itself, the RFID tag 120 can obtain energy from the interrogating RF signal.

It should be understood that Fig. 1 exemplarily shows an RFID reader-writer 110 and an RFID tag 120, in the RFID system 100, an RFID reader-writer 110 can communicate with a plurality of RFID tags 120, and the RFID system 100 can include There are multiple RFID reader-writers 110, which is not limited in this embodiment of the present invention.

Fig. 2 shows an RFID tag 200 provided by an embodiment of the present invention. The RFID tag 200 can be applied to the RFID system 100 shown in FIG. 1 , but the embodiment of the present invention is not limited thereto.

As shown in Figure 2, the RFID tag 200 includes:

The receiving unit 210 is configured to receive the first radio frequency signal sent by the RFID reader, and output the received first radio frequency signal;

The extraction unit 220 is configured to receive the first radio frequency signal output by the receiving unit 210, and perform envelope extraction processing on the first radio frequency signal to obtain the first baseband envelope signal;

The first amplification unit 230 is configured to receive the first baseband envelope signal output by the extraction unit 220, amplify the first baseband envelope signal to obtain a second baseband envelope signal, and output the second baseband envelope signal Signal;

The conversion unit 240 is configured to receive the second baseband envelope signal output by the first amplification unit 230, and perform conversion processing on the second baseband envelope signal to obtain a first baseband digital signal.

Specifically, the receiving unit 210 is used to receive the first radio frequency signal sent by the RFID reader-writer. The first radio frequency signal may be specifically a radio frequency signal carrying communication information, or may be specifically a pilot frequency, which is not discussed in this embodiment of the present invention. Do limited. Optionally, the receiving unit 210 may include a receiving antenna, but this embodiment of the present invention is not limited thereto.

The extracting unit 220 can extract the baseband envelope signal of the first radio frequency signal when receiving the first radio frequency signal output by the receiving unit 210 to obtain the first baseband envelope signal, and output the first baseband envelope signal. Optionally, the extracting unit 220 may include a wave detector, but this embodiment of the present invention is not limited thereto.

When the first amplifying unit 230 receives the first baseband envelope signal output by the extraction unit 220, it can amplify the first baseband envelope signal to obtain a second baseband envelope signal, and output the second baseband envelope signal. envelope signal.

The converting unit 240 may receive the second baseband envelope signal output by the first amplifying unit, and convert the second baseband envelope signal into a baseband digital signal. Optionally, the conversion unit 240 may include a quantizer, but this embodiment of the present invention is not limited thereto.

In the RFID tag provided by the embodiment of the present invention, the extraction unit extracts the baseband envelope signal of the first radio frequency signal to obtain the first baseband envelope signal, and the first amplification unit performs amplifying processing on the first baseband envelope signal to obtain the second For the baseband envelope signal, the conversion unit converts the second baseband envelope signal into a baseband digital signal, which can increase the communication distance between the RFID tag and the RFID reader, thereby improving the performance of the RFID system.

In addition, since the first amplifying unit is used to amplify the baseband envelope signal, the power consumption and bandwidth requirements of the first amplifying unit are relatively low, so it can be implemented with a low-power amplifier, thereby reducing the power of the RFID tag. consumption.

Optionally, the RFID tag 200 may further include a filtering unit 295, configured to receive the first radio frequency signal output by the receiving unit 210, and filter the first radio frequency signal to obtain a filtered first radio frequency signal. At this time, the extracting unit 220 can be specifically configured to receive the filtered first radio frequency signal output by the filtering unit 295, and perform envelope extraction processing on the filtered first radio frequency signal to obtain the first baseband envelope signal . Optionally, the filtering unit 295 may include a bandpass filter, which may be used to perform impedance matching with the receiving antenna to reduce loss of signals to be coupled, but this embodiment of the present invention is not limited thereto.

As an optional embodiment, the first amplifying unit 230 may be specifically configured to amplify a voltage difference between the first baseband envelope signal and the ground voltage. At this time, optionally, one end of the first amplifying unit 230 may be grounded, but this embodiment of the present invention is not limited thereto.

As another optional embodiment, the first amplification unit 230 may also be specifically configured to amplify the first baseband envelope signal according to the average voltage of the first baseband envelope signal. For example, the first amplifying unit 230 may amplify the voltage difference of the first baseband envelope signal relative to its average voltage. At this time, optionally, the first amplifying unit may also be used to determine the average voltage of the first baseband envelope signal. Or, optionally, as shown in FIG. 3 , the RFID tag 200 may also include an averaging unit 250 configured to receive the first baseband envelope signal output by the extraction unit 220, and determine the value of the first baseband envelope signal. average voltage; correspondingly, the first amplifying unit 230 can also be used to receive the average voltage output by the averaging unit 250, and perform amplification processing on the first baseband envelope signal according to the average voltage received, But the embodiments of the present invention are not limited thereto.

As another optional embodiment, the first amplifying unit 230 may adopt a negative feedback mechanism. Specifically, the first amplifying unit 230 may amplify the first baseband envelope signal according to the baseband envelope signal output by the first amplifying unit 230 before receiving the first baseband envelope signal, wherein, Optionally, the baseband envelope signal output by the first amplifying unit 230 before receiving the first baseband envelope signal may specifically be the output of the first amplifying unit at a moment before receiving the first baseband envelope signal The baseband envelope signal or the N baseband envelope signals output at the previous N moments, or the baseband envelope signal output by the first amplifying unit 230 at a certain time interval before receiving the first baseband envelope signal, but this Embodiments of the invention are not limited thereto.

In the embodiment of the present invention, the conversion unit 240 may be specifically configured to determine the voltage corresponding to the second baseband envelope signal according to the difference between the average voltage of the second baseband envelope signal and the first baseband envelope signal. digital codeword. Optionally, the converting unit 240 may also be configured to determine an average voltage of the second baseband envelope signal, and perform conversion processing on the second baseband envelope signal according to the determined average voltage. Or, optionally, as shown in FIG. 3 and FIG. 4, the RFID tag 200 may also include an averaging unit 250, configured to receive the first baseband envelope signal output by the extraction unit 220, and determine the first baseband envelope signal The average voltage of the signal, or for receiving the second baseband envelope signal output by the first amplification unit 230, and determining the average voltage of the second baseband envelope signal; correspondingly, the conversion unit 240 can also be used for The average voltage output by the averaging unit 250 is received, and the second baseband envelope signal is converted according to the received average voltage, but the embodiment of the present invention is not limited thereto.

As another optional embodiment, as shown in FIG. 4 , the first amplifying unit 230 may be specifically configured to amplify a voltage difference between the first baseband envelope signal and the ground voltage. At this point, optionally, the RFID tag 200 may also include: a second amplifying unit 260, configured to receive the average voltage output from the averaging unit 250, and perform amplifying processing on the received average voltage to obtain an amplifying process. After the average voltage. At this time, the converting unit 240 can be configured to receive the amplified average voltage output from the second amplifying unit 260, and according to the received amplified average voltage, the second baseband envelope signal Perform conversion processing. At this time, optionally, the average voltage output by the averaging unit 250 may be the average voltage of the first baseband envelope signal output by the extraction unit 220, but the embodiment of the present invention is not limited thereto.

As another optional embodiment, the RFID tag 200 may further include a digital signal processing unit, configured to receive the baseband digital signal output by the converting unit 240, and process the received baseband digital signal. Optionally, the digital signal processing unit may include a digital signal processing circuit or a data signal processing chip, such as a single-chip microcomputer, a micro control unit (Micro Control Unit, MCU), a digital logic circuit, etc., and the specific device may be based on the power consumption requirements of the application scene Definitely, the embodiment of the present invention does not limit this.

As another optional embodiment, as shown in FIG. 5 , the RFID tag 200 may further include: a switch unit 270 and a control unit 280 for controlling the state of the switch unit 270 .

The switch unit 270 can be used to bypass the first amplifying unit 230 . Specifically, when the switch unit 270 is in the first state, the first amplifying unit 230 may be in a working state, and accordingly, the converting unit 240 may be connected to the extracting unit 220 through the first amplifying unit 230 . At this time, the converting unit 240 may receive the second baseband envelope signal output by the first amplifying unit 230 . When the switch unit 270 is in the second state, the first amplifying unit 230 may be in a bypass state, and accordingly, the converting unit 240 may be connected to the extracting unit 220 without passing through the first amplifying unit 230, for example, the The conversion unit 240 may be directly connected to the extraction unit 220 . At this time, the converting unit 240 may receive the second baseband envelope signal output by the extracting unit 220, but the embodiment of the present invention is not limited thereto.

As an optional embodiment, the switching unit 270 may include a first switching device connected in parallel with the first amplifying unit 230 and a second switching device connected in series with the first amplifying unit 240 . Optionally, when the switch unit 270 is in the first state, the first switch device is turned off and the second switch device is turned on; when the switch unit 270 is in the second state, the first switch device is turned on, The second switching device is turned off, but the embodiment of the present invention is not limited thereto.

The control unit 280 can be used to control the state of the switch unit 270 . Optionally, the control unit 280 may send a control signal to the switch unit 270, and the control signal is used to control the state of the switch unit 270, but the embodiment of the present invention is not limited thereto.

In the RFID tag provided by the embodiment of the present invention, the control unit can control whether the first amplification unit works by controlling the state of the switch unit. In this way, when the radio frequency signal received by the RFID tag does not need to be amplified to meet the working conditions of the conversion unit, the switch unit can be used to bypass the first amplifying unit, and the devices in the first amplifying unit can be turned off (such as an amplifier) power supply, so that the power consumption of the RFID tag can be further reduced.

As an optional embodiment, the RFID tag 200 may also include: a counting unit 285, configured to receive the second baseband digital signal output by the converting unit 240, perform counting according to the received second baseband digital signal, and output Count results. The second baseband digital signal can be obtained by processing the radio frequency signal or pilot frequency sent by the RFID reader, wherein the pilot frequency here can be included in the radio frequency signal, or it can be the before sending the radio frequency signal, which is not limited in this embodiment of the present invention. At this time, the control unit 280 may be specifically configured to receive the counting result output by the counting unit 285 , and control the state of the switch unit 270 according to the counting result received.

Specifically, the counting unit 285 may be specifically configured to count according to the received analog waveform of the second baseband digital signal. Optionally, in one conversion cycle, the counting unit 285 can only count when the baseband digital signal is at a high level, for example, the counting result of the counting unit 285 is when the level of the second baseband digital signal is higher than a preset threshold Add 1, and keep unchanged when the level of the second baseband digital signal is lower than the preset threshold; or the counting unit 285 can only count when the second baseband digital signal is at a high level, the embodiment of the present invention This is not limited.

The counting unit 285 can be used to detect the slope of the analog waveform of the second baseband digital signal when level conversion occurs. Since the slowest conversion rate of the analog waveform of the output signal of the conversion unit 240 is determined by the communication symbol rate and the input threshold of the conversion unit when level conversion occurs, the minimum clock frequency of the counting unit 285 should be higher than the conversion The communication symbol rate of the unit 240, but the embodiment of the present invention is not limited thereto.

Specifically, if the magnitude of the input signal of the conversion unit 240 is relatively large, for example, the magnitude is higher than the threshold voltage of the conversion unit 240, the second baseband digital signal output by the conversion unit 240 is within one counting cycle of the counting unit 285 It can be converted from low level to high level, or from high level to low level, that is, the input signal of the counting unit 285 can be composed of multiple 0s or multiple 1s, and correspondingly, the counting result of the counting unit 285 Can be 0 or the maximum value. When the amplitude of the input signal of the conversion unit 240 is small, for example, the amplitude is lower than the threshold voltage of the conversion unit, the slope of the analog waveform of the second baseband digital signal output by the conversion unit 240 will decrease. At this time, the conversion The output signal of the unit 240 needs to go through a plurality of counting cycles to switch from low level to high level, or from high level to low level, that is, the input signal of the counting unit 285 is composed of 0 and 1, correspondingly, the The counting result of the counting unit 285 may be between 0 and a maximum value. In this way, the control unit 280 can determine the amplitude of the input signal of the converting unit 240 according to the counting result of the counting unit 285, and control the state of the switch unit 270 accordingly, but the embodiment of the present invention is not limited thereto.

Optionally, the control unit 280 may be implemented by the above-mentioned digital signal processing unit, but this embodiment of the present invention is not limited thereto.

At this time, optionally, the control unit 280 can be used to count the second baseband digital signal corresponding to the signal sent by the RFID reader before sending the first radio frequency signal according to the counting unit 285. As a result, the state of the switch unit 270 when the RFID tag processes the first radio frequency signal is determined. Wherein, the signal sent by the RFID reader before sending the first radio frequency signal may specifically be a second radio frequency signal or a pilot frequency. Optionally, the second radio frequency signal may carry communication information, and the second radio frequency signal may be a radio frequency signal received by the RFID tag at a previous moment, or may be a radio frequency signal separated from the current moment when the first radio frequency signal is received. The radio frequency signal received at a certain time period is not limited in this embodiment of the present invention.

Optionally, in the embodiment of the present invention, the RFID tag 200 may receive the pilot frequency sent by the RFID reader, and determine the state of the switch unit according to the received pilot frequency. As an optional embodiment, in the subsequent communication process, the state of the switch unit may remain unchanged. At this time, in the process of processing the first radio frequency signal carrying the communication information, the state of the switch unit may be determined according to the second baseband digital signal obtained by processing the pilot frequency. As another optional embodiment, the state of the switch unit can also be dynamically adjusted. At this time, the state of the switch unit in the subsequent communication process can be determined according to the currently received radio frequency signal. Correspondingly, in the process of processing the first radio frequency signal carrying communication information, the state of the switch unit may be determined according to the second baseband digital signal obtained by processing the previously received second radio frequency signal, but The embodiments of the present invention are not limited thereto.

Optionally, during the process of processing the radio frequency signal or pilot signal sent by the RFID reader to obtain the second baseband digital signal, the switch unit 270 can be in the second state, that is, the first amplifying unit 230 can be in the side road status, but this embodiment of the present invention is not limited thereto.

As another optional embodiment, the control unit 280 can be specifically configured to perform signal shaping processing on the radio frequency signal or pilot frequency sent by the RFID reader to obtain a signal shaping result, and control the switch unit according to the signal shaping result 270 state.

Specifically, the control unit 280 can be used to perform signal shaping processing on the radio frequency signal or pilot frequency output by the receiving unit 210; or, the control unit 280 can be used to perform signal shaping processing on the first baseband envelope signal output by the extraction unit 220 Signal shaping processing, but this embodiment of the present invention is not limited thereto. Optionally, as another embodiment, the control unit 280 may first perform voltage transformation processing on the received signal to obtain a voltage transformation processing result, and perform signal shaping processing on the voltage transformation processing result, but this embodiment of the present invention does not limited to this.

Optionally, the RFID tag 200 may also include: a coupling unit 290, configured to perform branching processing (also called coupling processing) on the signal to be coupled, wherein the signal to be coupled is based on the signal sent by the RFID reader owned. For example, the signal to be coupled may be the signal itself sent by the RFID reader-writer, or may be a signal obtained by the RFID tag by processing the signal sent by the RFID reader-writer. Optionally, the signal sent by the RFID reader-writer may refer to a radio frequency signal or a pilot frequency, but this embodiment of the present invention is not limited thereto.

Specifically, the coupling unit 290 may divide the signal to be coupled into at least two parts, one part is used to control the state of the switch unit 270, and the other part is used to obtain a baseband digital signal.

As an optional embodiment, the coupling unit 290 is configured to couple the first part of the signals to be coupled to the control unit 280 . At this point, optionally, the control unit 290 may include:

The voltage transformation unit 281 is configured to receive the first part of the signal to be coupled outputted by the coupling unit, and perform voltage transformation processing on the first part of the signal to be coupled to obtain the first part of the signal after the voltage transformation process;

The signal shaping unit 282 is configured to receive the transformed first part of the signal output by the transforming unit 281, and control the state of the switch unit according to the transformed first part of the signal.

At this time, the coupling unit 290 can also couple the second part of the signal to be coupled to the conversion unit 240, that is, the baseband digital signal output by the conversion unit 240 is passed through the signal to be coupled output to the coupling unit 290 obtained by processing the second part of the signal, but this embodiment of the present invention is not limited thereto.

Optionally, the power of the input signal of the signal shaping unit 282 may be relatively small, and at this time, the signal shaping unit 282 may have a relatively high impedance. Optionally, the signal shaping unit 282 may include a buffer, but this embodiment of the present invention is not limited thereto.

Specifically, when the level of the input signal of the signal shaping unit 282 is higher than the first threshold, the output of the signal shaping unit 282 may be 1, triggering the logic of the control unit, so that the switch unit 270 is in the second state; when the When the level of the input signal of the channel shaping unit 282 is lower than the second threshold, the output of the signal shaping unit 282 is 0, triggering the control unit logic, so that the switch unit 270 is in the first state; when the input of the signal shaping unit 282 When the level of the signal is between the first threshold and the second threshold, the output of the signal shaping unit 282 may be unstable, and at this time, the switch unit 270 may be in the first state, but the embodiment of the present invention is not limited thereto.

Optionally, the switch unit 270 may have a close threshold. Correspondingly, the control unit 280 may control the state of the switch unit 270 by comparing the output result of the signal shaping unit 282 with the close threshold of the switch unit 270 . As an optional example, when the power of the signal received by the RFID tag 200 is small, the level of the signal input to the control unit 280 after being processed by the transforming unit 281 and the signal shaping unit 282 may still be low. When the closing threshold of the switch unit 270 is reached, the switch unit 270 may be in the first state, and correspondingly, the first amplifying unit 230 may maintain the working state. When the power of the signal received by the RFID tag 200 is relatively large, the level of the signal input to the control unit 280 may exceed the closing threshold of the switch unit 270 after being processed by the transformer unit 281 and the signal shaping unit 282, At this moment, the switch unit 270 may be in the second state, and correspondingly, the first amplifying unit 230 may be in the bypass state, but the embodiment of the present invention is not limited thereto.

The transforming unit 281 can be used to increase the level of the input signal under the condition of keeping the power constant. Optionally, the transformation unit 281 may include a 1:N transformer, where the value of N may be determined by the voltage threshold of the conversion unit 240, the coupling ratio of the coupling unit 290, and the first threshold of the signal shaping unit 282, but This embodiment of the present invention does not limit this.

Optionally, the voltage transformation unit 281 may also be implemented in an equivalent manner, such as Norton transformation, which is not limited in this embodiment of the present invention.

Optionally, the coupling unit 290 may receive the signal output by the receiving unit 210, and branch the received signal into a part flowing to the control unit 280 and a part flowing to the extraction unit 220; or, the coupling unit 290 may receive The baseband envelope signal output by the extraction unit 220 is split into a part flowing to the control unit 280 and a part flowing to the first amplifying unit 230 , which is not limited in this embodiment of the present invention.

As an optional example, the signal to be coupled may specifically be the baseband envelope signal output by the extraction unit 220 .

At this time, the coupling unit 290 can be used to receive the baseband envelope signal output by the extraction unit 220, couple the second part of the baseband envelope signal to the first amplification unit 230, and convert the baseband envelope signal to The first part of the signal is coupled to the control unit 280 .

At this time, the first amplifying unit 230 may be specifically configured to receive the second part of the signal output by the coupling unit 290 and amplify the second part of the signal.

At this time, optionally, when processing the first radio frequency signal, the first amplifying unit may be specifically configured to receive the second part of the first baseband envelope signal output by the coupling unit 290, and to The second part of the first baseband envelope signal is amplified to obtain a second baseband envelope signal.

As another optional example, the signal to be coupled may specifically be a signal output by the receiving unit 210 .

At this time, the coupling unit 290 may be used to receive the radio frequency signal output by the receiving unit 210, wherein the radio frequency signal here may be a pilot frequency or a radio frequency signal carrying data. The coupling unit 290 can couple the second part of the radio frequency signal to the extraction unit 220 , and couple the first part of the radio frequency signal to the control unit 280 .

At this time, the extracting unit 220 may be specifically configured to receive the second part of the signal output by the coupling unit 290, and extract the baseband envelope signal of the second part of the signal.

At this time, optionally, when processing the first radio frequency signal, the extraction unit 220 can be used to receive the second part of the first radio frequency signal output by the coupling unit 290, and The second part of the signal is subjected to envelope extraction processing to obtain the first baseband envelope signal.

Optionally, when processing the first radio frequency signal, the control unit 280 may specifically determine the switching unit 270 according to the second radio frequency signal or pilot frequency sent by the RFID reader before sending the first radio frequency signal. state, but the embodiment of the present invention is not limited thereto.

As another optional embodiment, the control unit 280 may be specifically configured to control the state of the switch unit 270 according to the demodulation processing result of the pilot sent by the RFID reader. Optionally, the pilot here may be a specially designed pilot for controlling the state of the switch unit 270, but the embodiment of the present invention is not limited thereto.

Specifically, before the RFID reader sends the radio frequency signal, a pilot frequency can be sent. The RFID tag 200 can demodulate the pilot frequency sent by the RFID reader under the condition that the switch unit 270 is in the first state, obtain the first demodulation processing result, and can perform demodulation processing when the switch unit 270 is in the second state. Perform demodulation processing on the pilot frequency sent by the RFID reader-writer under the condition of the state, and obtain the second demodulation processing result. The control unit 280 may determine whether the switch unit 270 is in the first state or the second state according to the first demodulation processing result and the second demodulation processing result, but the embodiment of the present invention is not limited thereto.

The RFID tag provided by the embodiment of the present invention will be described in more detail below with reference to specific examples. Fig. 6 is a schematic diagram of an example of an RFID tag 300 provided by another embodiment of the present invention. The RFID tag 300 includes: receiving antenna 310, BPF395, signal detector (Signal Detector) 320, amplifier 330, quantizer 340, averager 350, first switch 371, second switch 372, counter 385 and baseband digital signal processing circuit 390, wherein the first switch 371 can be connected in series with the amplifier 330 and/or the power supply (VDD) of the amplifier 330, and the second switch 372 can be connected in parallel with the amplifier 330 and/or the power supply of the amplifier 330. The first switch 371 and the second switch 372 may be connected in reverse logic, that is, the first switch 371 and the second switch 372 are in opposite states at the same time. In the RFID tag 300, the state of the first switch 371 and the second switch 372 can be controlled by counting the baseband digital signal corresponding to the pilot or radio frequency signal sent by the RFID reader-writer, so that the Amplifier 330 is either active or inactive.

Optionally, in a default state, the first switch 371 can be turned off, and the second switch 372 can be turned on, at this time, the amplifier 330 can be in a bypass state. The receiving antenna 310 can receive the pilot or radio frequency signal sent by the RFID reader, and output the pilot or radio frequency signal. The pilot or radio frequency signal can be sequentially processed by the BPF 395 , the signal detector 320 , the averager 350 and the quantizer 340 to obtain a baseband digital signal.

Specifically, the BPF 395 may be used to receive a signal output by the receiving antenna 310, where the signal may be a radio frequency signal carrying communication information or data, or a simple pilot. The BPF 395 can filter the received signal, obtain the filtered signal, and output the filtered signal. The signal detector 320 may be configured to receive the filtered signal output by the BFP 395, perform envelope extraction processing on the received signal, obtain a baseband envelope signal, and output the baseband envelope signal. The averager 350 can be used to receive the baseband envelope signal output by the signal detector 320, determine the average voltage of the baseband envelope signal, and output the average voltage. The amplifier 330 can be used to receive the baseband envelope signal output by the signal detector 320 and the average voltage output by the comparator 340, and amplify the voltage difference between the baseband envelope signal and the average voltage value to obtain a second baseband envelope signal , and output the second baseband envelope signal. The quantizer 340 can be used to receive the second baseband envelope signal output by the amplifier 330 and the average voltage output by the averager 350, and convert the second baseband envelope signal according to the average voltage value to obtain a baseband digital signal , and output the baseband digital signal.

The counter 385 can receive the baseband digital signal output by the quantizer 340, count according to the received baseband digital signal, obtain a counting result, and output the counting result. The baseband digital signal processing circuit 390 can receive the counting result output by the counter 385, and determine whether to continue to bypass the amplifier 330 according to the counting result, and accordingly generate a signal for controlling the state of the first switch and the second switch. control signal.

Fig. 7 is a schematic diagram of an RFID tag 400 provided by another embodiment of the present invention. The RFID tag 400 includes: receiving antenna 410, BPF 495, coupler 485, signal detector 420, amplifier 430, quantizer 440, averager 450, first switch 471, second switch 472, transformer 480 and baseband digital signal processing Circuit 490. Wherein, the baseband digital signal processing circuit 490 may include a buffer 419 and a signal trigger 492 . In the RFID tag 400, the state of the amplifier is controlled according to the buffered result obtained by processing the radio frequency signal or pilot frequency sent by the RFID reader/writer.

Specifically, the receiving antenna 410 may be used to receive signals sent by the RFID reader-writer and output the received signals. The BPF 495 may be used to receive the signal output by the receiving antenna 410, filter the received signal, obtain the filtered signal, and output the filtered signal. The coupler 485 can be used to receive the filtered signal output by the BFP 495 and split the received signal into a second part of the signal flowing to the signal detector 420 and a first part of the signal flowing to the transformer 480 .

On the one hand, the transformer 480 can be used to receive the first part of the signal output by the coupler 485, perform voltage transformation processing on the received first part of the signal, obtain the first part of the signal after the voltage transformation processing, and output the transformed voltage processed first part signal. The first part of the signal. The buffer 491 may be used to receive the transformed first part of the signal output by the transformer 482, perform signal shaping processing on the received signal, obtain a signal shaping result, and output the signal shaping result. The signal trigger 492 can be used to receive the signal shaping result output by the buffer 491 , and generate a control signal for controlling the states of the first switch 471 and the second switch 472 according to the signal shaping result.

On the other hand, the signal detector 420 may be configured to receive the second part of the signal output by the coupler 485, perform envelope extraction processing on the received signal, obtain a baseband envelope signal, and output the baseband envelope signal. The averager 450 can be used to receive the baseband envelope signal output by the signal detector 420, determine the average voltage of the baseband envelope signal, and output the average voltage. Optionally, if the first switch 471 is closed and the second switch 472 is open, the amplifier 440 can be used to receive the baseband envelope signal output by the signal detector 420 and the voltage average value output by the comparator 440, and amplify the baseband envelope signal. The voltage difference of the envelope signal relative to the average voltage is obtained to obtain an amplified baseband envelope signal, and the amplified baseband envelope signal is output. The quantizer 440 may be used to receive the amplified baseband envelope signal output by the amplifier 440 and the average voltage output by the averager 450, and convert the amplified baseband envelope signal according to the average voltage , obtain the baseband digital signal, and output the baseband digital signal. Optionally, if the first switch 471 is open and the second switch 472 is closed, the quantizer 440 can be used to receive the first baseband envelope signal output by the signal detector 420 and the baseband envelope signal output by the averager 450 The voltage average value of the signal, and according to the received voltage average value, the baseband envelope signal is converted and processed to obtain the baseband digital signal.

The baseband digital signal processing circuit can receive the baseband digital signal output by the quantizer 440, and process the baseband digital signal to obtain a signal processing result.

It should be noted that the examples in FIG. 6 and FIG. 7 are intended to help those skilled in the art better understand the embodiments of the present invention, rather than limiting the scope of the embodiments of the present invention. Those skilled in the art can obviously make various equivalent modifications or changes based on the examples shown in FIG. 6 and FIG. 7 , and such modifications or changes also fall within the scope of the embodiments of the present invention.

The RFID tag according to the embodiment of the present invention is described in detail above with reference to FIG. 1 to FIG. 7 , and the method for processing radio frequency signals according to the embodiment of the present invention will be described below in conjunction with FIG. 8 .

FIG. 8 shows a method 500 for processing radio frequency signals provided by an embodiment of the present invention.

S510. Receive a first radio frequency signal sent by the RFID reader-writer.

S520. Perform envelope extraction processing on the first radio frequency signal to obtain the first baseband envelope signal.

S530. Perform amplification processing on the first baseband envelope signal to obtain a second baseband envelope signal.

Optionally, the voltage difference of the first baseband envelope signal relative to its average voltage may be amplified, or the voltage difference of the first baseband envelope signal relative to the ground voltage may be amplified, which is not done in the embodiment of the present invention limited.

S540. Perform conversion processing on the second baseband envelope signal to obtain a first baseband digital signal.

Optionally, conversion processing may be performed on the second baseband envelope signal according to the average voltage of the first baseband envelope signal.

Optionally, if the second baseband envelope signal is obtained by amplifying the voltage difference between the baseband envelope signal and the ground, then in S540, based on the average voltage of the amplification process of the baseband envelope signal, the The conversion process is performed on the second baseband envelope signal, wherein the amplification factor of the average voltage value may be the same as the amplification factor of the baseband envelope signal, but the embodiment of the present invention is not limited thereto.

Optionally, as shown in FIG. 8, before S530, the method 500 further includes:

S550. Determine to perform amplification processing on the first baseband envelope signal.

As an optional embodiment, in S550, determining to perform amplification processing on the first baseband envelope signal includes:

Counting is performed according to the second baseband digital signal to obtain a counting result, wherein the second baseband digital signal is obtained by processing a signal sent by the RFID reader before sending the first radio frequency signal;

According to the counting result, it is determined to perform amplification processing on the first baseband envelope signal.

Optionally, the counting result may reflect a slope of the analog waveform of the second baseband digital signal when level conversion occurs, but this embodiment of the present invention is not limited thereto.

As another optional embodiment, the signal sent by the RFID reader before sending the first radio frequency signal can be divided into at least two parts, and part of the signal is used to determine whether to amplify the subsequently received radio frequency signal . At this point, optionally, S550, determining to perform amplification processing on the first baseband envelope signal, including:

performing voltage transformation processing on the first part of the signal to be coupled to obtain the first part of the signal after the voltage transformation processing, wherein the signal to be coupled is obtained according to the signal sent by the RFID reader before sending the first radio frequency signal;

According to the first part of the signal after the voltage transformation processing, it is determined to perform amplification processing on the first baseband envelope signal.

At this time, optionally, the first baseband digital signal may be obtained by performing envelope extraction processing on the second part of the first radio frequency signal.

Optionally, the signal sent by the RFID reader before sending the first radio frequency signal is specifically a second radio frequency signal or a pilot frequency. Optionally, the second radio frequency signal may carry communication information, but the embodiment of the present invention Not limited to this.

As an optional embodiment, the signal to be coupled is specifically a second radio frequency signal or a pilot frequency sent by the RFID reader before sending the first radio frequency signal. At this time, optionally, the received first radio frequency signal may be divided into at least two parts of signals, and the first baseband digital signal may be obtained by processing the second part of the at least two parts of signals.

Optionally, it may also be determined according to the first part of the at least two part signals whether to amplify the baseband envelope signal of the subsequently received radio frequency signal, but the embodiment of the present invention is not limited thereto.

Correspondingly, S520, performing extraction processing on the first radio frequency signal to obtain the first baseband envelope signal includes: performing extraction processing on the second part of the first radio frequency signal to obtain the first baseband envelope signal .

As another optional embodiment, the signal to be coupled is specifically the baseband envelope signal of the second radio frequency signal sent by the RFID reader before sending the first radio frequency signal, or the RFID reader sends the first radio frequency signal The baseband envelope signal of the pilot sent before an RF signal.

At this time, optionally, the baseband envelope signal may be divided into at least two parts of the signal, and the baseband digital signal is obtained by processing the second part of the at least two parts of the signal.

Optionally, it may also be determined whether to amplify the baseband envelope signal of the subsequently received radio frequency signal for the first part of the at least two part signals, but this embodiment of the present invention is not limited thereto.

Correspondingly, S530, performing amplification processing on the first baseband envelope signal to obtain a second baseband envelope signal, including:

The second part of the first baseband envelope signal is amplified to obtain a second baseband envelope signal.

As another optional embodiment, in S550, determining to perform amplification processing on the first baseband envelope signal includes:

According to the demodulation processing result of the pilot sent by the RFID reader before sending the first radio frequency signal, it is determined to perform amplification processing on the first baseband envelope signal.

It should be understood that the method 500 can be executed by the RFID tag in any of the above embodiments, and its steps and/or processes can refer to the above description of the RFID tag, and for the sake of brevity, details are not repeated here.

It should also be understood that the sequence numbers of the above processes do not mean the order of execution, and the execution order of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

It should also be understood that, in the embodiments of the present invention, the term and/or is merely a description of an association relationship of associated objects, indicating that there may be three types of relationships. For example, A and/or B may mean that A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character / in this article generally indicates that the contextual objects are an OR relationship.

Those of ordinary skill in the art can realize that, in combination with the various method steps and units described in the embodiments disclosed herein, they can be implemented by electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the possibility of hardware and software For interchangeability, in the above description, the steps and components of each embodiment have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those of ordinary skill in the art may use different methods to implement the described functions for each particular application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium In, several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other various media that can store program codes. .

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (21)

1. A radio frequency identification RFID tag is characterized in that, comprising: The receiving unit is used to receive the first radio frequency signal sent by the RFID reader; An extraction unit, configured to receive the first radio frequency signal output by the receiving unit, and perform envelope extraction processing on the first radio frequency signal to obtain a first baseband envelope signal; a first amplification unit, configured to receive the first baseband envelope signal output by the extraction unit, and amplify the first baseband envelope signal to obtain a second baseband envelope signal; The conversion unit is configured to receive the second baseband envelope signal output by the first amplification unit, and perform conversion processing on the second baseband envelope signal to obtain a first baseband digital signal. 2. The RFID tag according to claim 1, further comprising: an average unit, wherein, The averaging unit is configured to receive the first baseband envelope signal output by the extraction unit, and determine a voltage average value of the first baseband envelope signal; The converting unit is specifically configured to receive the average voltage output by the averaging unit, and perform conversion processing on the second baseband envelope signal according to the average voltage. 3. The RFID tag according to claim 2, wherein the first amplifying unit is specifically configured to receive the average voltage output by the averaging unit, and according to the average voltage received, to The first baseband envelope signal is amplified to obtain the second baseband envelope signal. 4. The RFID tag according to claim 2, further comprising: a second amplifying unit, wherein, The second amplifying unit is configured to receive the average voltage output by the averaging unit, and perform amplifying processing on the average voltage to obtain the average voltage after amplifying processing; The converting unit is specifically configured to receive the amplified average voltage output from the second amplifying unit, and perform conversion processing on the second baseband envelope signal according to the amplified average voltage . 5. The RFID tag according to any one of claims 1 to 4, further comprising: a switch unit, wherein, The conversion unit is specifically configured to receive the second baseband envelope signal output by the first amplification unit when the switch unit is in the first state, and perform conversion processing on the second baseband envelope signal, Obtain the first baseband digital signal. 6. The RFID tag according to claim 5, further comprising: a counting unit and a control unit, wherein, The counting unit is configured to receive the second baseband digital signal output by the conversion unit, and perform counting according to the second baseband digital signal, wherein the second baseband digital signal is read and written by processing the RFID obtained by the second radio frequency signal or pilot sent by the device; The control unit is configured to receive the counting result output by the counting unit, and control the state of the switching unit according to the counting result. 7. The RFID tag according to claim 5, further comprising: a coupling unit, a transformer unit and a signal shaping unit, wherein, The coupling unit is used to couple the first part of the signal to be coupled to the voltage transformation unit, wherein the signal to be coupled is obtained according to the signal sent by the RFID reader; The voltage transformation unit is configured to receive a first part of the signal to be coupled outputted by the coupling unit, and perform a voltage transformation process on the first part of the signal to be coupled to obtain a first part after the voltage transformation process Signal; The signal shaping unit is configured to receive the transformed first partial signal output by the transforming unit, and control the state of the switch unit according to the transformed first partial signal. 8. The RFID tag according to claim 7, wherein the signal to be coupled is specifically the second radio frequency signal or pilot frequency sent by the RFID reader-writer; The coupling unit is further configured to receive the signal to be coupled outputted by the receiving unit, and couple a second part of the signal to be coupled to the extraction unit; The extracting unit is specifically configured to receive the second part of the signal in the first radio frequency signal output by the coupling unit, and perform envelope extraction processing on the second part of the signal in the first radio frequency signal to obtain the A first baseband envelope signal. 9. The RFID tag according to claim 7, wherein the signal to be coupled is specifically the baseband envelope signal of the second radio frequency signal sent by the RFID reader-writer or the guide signal sent by the RFID reader-writer. Frequency baseband envelope signal; The coupling unit is further configured to receive the signal to be coupled outputted by the extraction unit, and couple a second part of the signal to be coupled to the first amplifying unit; The first amplifying unit is specifically configured to receive a second part of the signal in the first baseband envelope signal output by the coupling unit, and amplify the second part of the signal in the first baseband envelope signal , to obtain the second baseband envelope signal. 10. The RFID tag according to claim 5, further comprising: The control unit is configured to control the state of the switch unit according to the demodulation processing result of the pilot sent by the RFID reader. 11. A method for processing radio frequency signals, comprising: receiving the first radio frequency signal sent by the radio frequency identification RFID reader; performing envelope extraction processing on the first radio frequency signal to obtain a first baseband envelope signal; amplifying the first baseband envelope signal to obtain a second baseband envelope signal; Perform conversion processing on the second baseband envelope signal to obtain a first baseband digital signal. 12. The method according to claim 11, wherein, before said second baseband envelope signal is converted and processed to obtain the first baseband digital signal, said method further comprises: determining a voltage average of said first baseband envelope signal; The converting the second baseband envelope signal to obtain the first baseband digital signal includes: Converting the second baseband envelope signal according to the average voltage of the first baseband envelope signal to obtain a first baseband digital signal. 13. The method according to claim 12, wherein said amplifying said first baseband envelope signal to obtain a second baseband envelope signal comprises: According to the average voltage value of the first baseband envelope signal, the first baseband envelope signal is amplified to obtain the second baseband envelope signal. 14. The method according to claim 12, characterized in that, before said second baseband envelope signal is converted and processed according to the voltage average value of said first baseband envelope signal, said method further include: performing amplifying processing on the average voltage of the first baseband envelope signal to obtain an amplified average voltage; The converting the second baseband envelope signal according to the average voltage of the first baseband envelope signal includes: Perform conversion processing on the second baseband envelope signal according to the amplified average voltage value. 15. The method according to any one of claims 11 to 14, wherein, before said first baseband envelope signal is amplified, said method further comprises: Determine to perform amplification processing on the first baseband envelope signal. 16. The method according to claim 15, wherein said determining to amplify said first baseband envelope signal comprises: Counting is performed according to the second baseband digital signal to obtain a counting result, wherein the second baseband digital signal is obtained by processing a signal sent by the RFID reader before sending the first radio frequency signal; According to the counting result, it is determined to perform amplification processing on the first baseband envelope signal. 17. The method according to claim 14, wherein said determining to amplify said first baseband envelope signal comprises: performing voltage transformation processing on the first part of the signal to be coupled to obtain the first part of the signal after the voltage transformation processing, wherein the signal to be coupled is based on the signal sent by the RFID reader before sending the first radio frequency signal owned; Determine to perform amplification processing on the first baseband envelope signal according to the first part of the voltage-transformed signal. 18. The method according to claim 17, wherein the signal to be coupled is specifically a second radio frequency signal or a pilot sent by the RFID reader before sending the first radio frequency signal; The performing envelope extraction processing on the first radio frequency signal to obtain the first baseband envelope signal includes: performing envelope extraction processing on the second part of the first radio frequency signal to obtain the first baseband envelope signal. 19. The method according to claim 17, wherein the signal to be coupled is specifically a baseband envelope signal of a second radio frequency signal sent by the RFID reader before sending the first radio frequency signal, or is the baseband envelope signal of the pilot sent by the RFID reader before sending the first radio frequency signal; The amplifying the first baseband envelope signal to obtain the second baseband envelope signal includes: Amplifying the second part of the first baseband envelope signal to obtain a second baseband envelope signal. 20. The method according to any one of claims 17 to 19, wherein the signal sent by the RFID reader before sending the first radio frequency signal is specifically a second radio frequency signal or a pilot frequency. 21. The method according to claim 15, wherein said determining to amplify said first baseband envelope signal comprises: According to the demodulation processing result of the pilot sent by the RFID reader before sending the first radio frequency signal, it is determined to perform amplification processing on the first baseband envelope signal.