CN114629531A - Near field communication circuit and electronic device - Google Patents
Near field communication circuit and electronic device Download PDFInfo
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- CN114629531A CN114629531A CN202011448835.5A CN202011448835A CN114629531A CN 114629531 A CN114629531 A CN 114629531A CN 202011448835 A CN202011448835 A CN 202011448835A CN 114629531 A CN114629531 A CN 114629531A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application provides a near field communication circuit and electronic equipment, this near field communication circuit includes transmitting antenna, receiving antenna, near field communication chip and signal processing module, wherein: the input end of the transmitting antenna is connected with the output end of the near field communication chip, the input end of the near field communication chip is connected with the output end of the signal processing module, the input end of the signal processing module is connected with the output end of the receiving antenna, and the transmitting antenna and the receiving antenna realize transceiving separation; at least one of the transmitting antenna and the receiving antenna is a high quality factor antenna, which is an antenna with a quality factor higher than a preset threshold. The near field communication circuit and the electronic equipment are free from bandwidth limitation by adopting the antenna with the transmitting and receiving separated, and possibility is provided for adopting the high-quality-factor antenna, so that the acting distance of near field communication can be increased.
Description
Technical Field
The present application relates to the field of near field communication technologies, and in particular, to a near field communication circuit and an electronic device.
Background
Near Field Communication (NFC) is a technology for realizing Near Field Communication. Generally, the way to increase the NFC range includes two ways: the transmission power is improved and the receiving sensitivity is improved.
At present, most of existing schemes improve the near field communication range by improving the transmission power, such as by increasing the radius of the antenna, improving the coupling efficiency, increasing the magnetic permeability of the magnetic core, and the like, and such a method has a limited effect in improving the transmission power, so that the effect of improving the near field communication range is limited.
Disclosure of Invention
The present application is proposed to solve the above problems. According to an aspect of the present application, there is provided a near field communication circuit, including a transmitting antenna, a receiving antenna, a near field communication chip, and a signal processing module, wherein: the input end of the transmitting antenna is connected with the output end of the near field communication chip, the input end of the near field communication chip is connected with the output end of the signal processing module, the input end of the signal processing module is connected with the output end of the receiving antenna, and the transmitting antenna and the receiving antenna realize transceiving separation; at least one of the transmitting antenna and the receiving antenna is a high quality factor antenna, which is an antenna with a quality factor higher than a preset threshold.
In an embodiment of the present application, the implementing the transceiving separation between the transmitting antenna and the receiving antenna includes: the transmitting antenna and the receiving antenna are not physically separated, and the resonant center frequency of the transmitting antenna is not equal to the resonant center frequency of the receiving antenna; or the transmitting antenna is physically separated from the receiving antenna, and the resonant center frequency of the transmitting antenna is not equal to the resonant center frequency of the receiving antenna.
In one embodiment of the present application, the preset threshold is equal to 25.
In an embodiment of the present application, the signal processing module includes a frequency converter, an input end of the frequency converter is connected to the output end of the receiving antenna, and an output end of the frequency converter is connected to the input end of the near field communication chip.
In an embodiment of the present application, the signal processing module further includes a frequency conversion pre-processing submodule, an input end of the frequency conversion pre-processing submodule is connected to the output end of the receiving antenna, and an output end of the frequency conversion pre-processing submodule is connected to an input end of the frequency converter.
In an embodiment of the present application, the processing submodule before frequency conversion includes a first filter, an input end of the first filter is connected to an output end of the receiving antenna, and an output end of the first filter is connected to an input end of the frequency converter; or the frequency conversion pre-processing sub-module comprises an amplifier, the input end of the amplifier is connected with the output end of the receiving antenna, and the output end of the amplifier is connected with the input end of the frequency converter.
In an embodiment of the present application, the processing submodule before frequency conversion includes a first filter and an amplifier, and an output terminal of the receiving antenna is connected to an input terminal of the first filter; the output end of the first filter is connected with the input end of the amplifier; and the output end of the amplifier is connected with the input end of the frequency converter.
In an embodiment of the present application, the signal processing module further includes a frequency conversion post-processing submodule, an input end of the frequency conversion post-processing submodule is connected to an output end of the frequency converter, and an output end of the frequency conversion post-processing submodule is connected to an input end of the near field communication chip.
In an embodiment of the present application, the frequency conversion post-processing sub-module includes a second filter, an input end of the second filter is connected to an output end of the frequency converter, and an output end of the second filter is connected to an input end of the near field communication chip.
According to another aspect of the present application, there is provided an electronic device including the above-described near field communication circuit.
According to near field communication circuit and electronic equipment of this application embodiment through adopting the antenna of receiving and dispatching separation for no longer receive the bandwidth restriction, for adopting high quality factor antenna to provide probably, therefore can improve transmit power when transmitting antenna adopts high quality factor antenna, can improve the receiving sensitivity when receiving antenna adopts high quality factor antenna, the operating distance of near field communication can be promoted to either of these two homoenergetic, when transmitting antenna and receiving antenna both adopt high quality factor antenna, then can promote near field communication's operating distance more in an order of magnitude.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 shows a schematic circuit structure diagram of a near field communication circuit according to one embodiment of the present application.
Fig. 2 shows a schematic circuit configuration diagram of a near field communication circuit according to another embodiment of the present application.
Fig. 3 shows a schematic circuit configuration diagram of a near field communication circuit according to yet another embodiment of the present application.
Fig. 4 shows a schematic circuit structure diagram of a near field communication circuit according to yet another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, exemplary embodiments according to the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the application described in the application without inventive step, shall fall within the scope of protection of the application.
The existing near field communication circuit improves the NFC operating distance by increasing the transmission power, such as by increasing the radius of the antenna, improving the coupling efficiency, increasing the magnetic permeability of the magnetic core, and the like. This is described below by way of example.
In one example, an existing near field communication circuit includes an NFC chip, a first NFC coil, a second NFC coil, a power supply circuit, and a controller. The controller controls the power supply circuit to supply power to the other one of the first NFC coil and the second NFC coil under the condition that the NFC signal is detected by one of the first NFC coil and the second NFC coil, so that an electromagnetic field is generated by the other one of the first NFC coil and the second NFC coil, and compared with a structure with only one coil, the purpose of increasing the magnetic field is achieved, the transmitting power is improved, and the purpose of increasing the near field communication action distance is achieved.
In another example, an existing near field communication circuit includes an NFC module, a charge management module, and a micro-processing unit (MCU) control module. The MCU control module controls the working states of the charging management module and the NFC module, when NFC communication is needed, the charging management module boosts the voltage of the battery, and the transmitting power is improved by a method of boosting the working voltage, so that the purpose of increasing the near field communication action distance is achieved.
In yet another example, an existing near field communication circuit includes a baseband chip, a radio frequency transceiver module, an NFC chip, an analog single pole double throw switch, and a power amplifier. The on-state of the analog single-pole double-throw switch is controlled through the baseband chip, the power amplifier is correspondingly controlled to be turned on and off according to the on-state of the analog single-pole double-throw switch, and a signal transmitted by the NFC chip is amplified when the power amplifier is turned on, so that the transmitting power is improved, and the purpose of increasing the near field communication action distance is achieved.
Generally, the above existing near field communication circuit has a limited effect in promoting a near field communication range. Based on this, the present application provides a near field communication circuit with separate antenna transceiving, which can greatly increase the near field communication range compared to the conventional transmitting antenna, and is described below with reference to fig. 1 to 4.
Fig. 1 shows a schematic circuit configuration diagram of a near field communication circuit 100 according to an embodiment of the present application. As shown in fig. 1, the near field communication circuit 100 includes a transmitting antenna 110, a receiving antenna 120, a Near Field Communication (NFC) chip 130, and a signal processing module 140. Wherein: the input end of the transmitting antenna 110 is connected with the output end 130 of the near field communication chip; the output end of the receiving antenna 120 is connected with the input end of the signal processing module 140; the output end of the signal processing module 140 is connected with the input end of the near field communication chip 130; the transmitting antenna 110 and the receiving antenna 120 realize the transceiving separation; at least one of the transmit antenna 110 and the receive antenna 120 is a high-Q antenna, which refers to an antenna having a Q value above a predetermined threshold (which may be an industry-recognized threshold above which the high-Q antenna is a threshold; in one example, the predetermined threshold may be 25).
In an embodiment of the present application, the near field communication chip 130 may support an ISO/IEC 14443 protocol, and provide modulation and demodulation and logic operations of radio frequency signals from a Proximity Coupling Device (PCD) to a Proximity Integrated Circuit Card (PICC) and from the PICC to the PCD, which are compliant with ISO/IEC 14443 protocol requirements. The signal modulated by the near field communication chip 130 is transmitted via the transmitting antenna 110; the signal received by the receiving antenna 120 may be processed by the signal processing module and input to the near field communication chip 130 for demodulation. In the embodiment of the present application, separate transceiving antennas are used, that is, the transmitting antenna 110 and the receiving antenna 120 are separate transceiving, where the separate transceiving is understood as: frequency separation, or physical separation plus frequency separation. Wherein, the physical separation means that the transmitting antenna 110 and the receiving antenna 120 are not the same antenna; the frequency separation means that the resonant center frequency of the transmitting antenna 110 and the resonant center frequency of the receiving antenna 120 are not equal.
When the transmitting antenna 110 and the receiving antenna 120 are not the same antenna, the quality factor (Q value) of the antenna may be no longer limited, which provides a possibility for the near field communication circuit 100 to employ a high Q antenna.
The quality factor (Q) may also be improved when the transmit antenna 110 and the receive antenna 120 are frequency separated from each other.
Further, it is easier to improve the quality factor (Q value) when the transmitting antenna 110 and the receiving antenna 120 are neither the same antenna nor frequency-separated from each other.
For an antenna with no separation of transmitting and receiving frequencies, the quality factor (Q value) of the antenna is limited by the bandwidth, so that the range of near field communication cannot be increased by adopting a high Q value antenna. In the embodiment of the present application, based on the antenna with separate transmission and reception, the quality factor (Q value) of the antenna is no longer limited by the bandwidth, which provides a possibility for the near field communication circuit 100 to adopt a high Q value antenna. Thus, when the transmitting antenna 110 adopts a high-Q antenna, the transmitting power can be increased, thereby increasing the range of near field communication; under the condition that the receiving antenna 120 adopts a high-Q antenna, the capability of the receiving antenna 120 for inhibiting out-of-band signals can be improved, so that the receiving sensitivity is improved, and the action distance of near field communication is increased; under the condition that the transmitting antenna 110 and the receiving antenna 120 both adopt high-Q antennas, the transmission power and the receiving sensitivity can be improved, and the action distance of near field communication is greatly increased.
In an embodiment of the present application, when the resonant center frequency of the transmitting antenna 110 and the resonant center frequency of the receiving antenna 120 are not equal, not only is the quality factor (Q value) of the antenna not limited any more, which provides a possibility for the near field communication circuit 100 to adopt a high Q value antenna, but also noise from the transmitting antenna 110 is not or rarely received by the receiving antenna 120, noise received by the receiving antenna 120 is reduced, which can further improve the receiving sensitivity, thereby further improving the range of the near field communication. For example, in one example, the resonant center frequency of the receive antenna 120 can be 13.56MHz and the resonant center frequency of the transmit antenna 110 can be 14.47 MHz. In another example, the resonant center frequency of the receiving antenna 120 may be 13.56MHz and the resonant center frequency of the transmitting antenna 110 may be 12.65 MHz. Both of the two examples can be applied to an application scenario in which the mobile phone performs near field communication with the vehicle, such as the mobile phone is close to a certain place of the vehicle (such as a rearview mirror, a handle of the vehicle, etc.), and automatic unlocking is realized through the near field communication between the mobile phone and the vehicle.
Based on the above description, the near field communication circuit 100 according to the embodiment of the present application is not limited by bandwidth by using the antennas with separate transmission and reception, and provides a possibility for using the high-quality-factor antenna, so that the transmission power can be increased when the transmission antenna uses the high-quality-factor antenna, the receiving sensitivity can be increased when the receiving antenna uses the high-quality-factor antenna, and both of the antennas can increase the range of the near field communication, and when both of the transmission antenna and the receiving antenna use the high-quality-factor antenna, the range of the near field communication can be increased by a greater order.
In a further embodiment of the present application, the signal processing module 140 in the near field communication circuit 100 according to the embodiment of the present application may include a frequency converter 143, configured to frequency-convert the signal output by the receiving antenna 120 and input the signal to the near field communication chip 130; in addition, the signal processing module 140 may further include a pre-frequency conversion processing sub-module and/or a post-frequency conversion processing sub-module (not shown in fig. 1, which will be described later in conjunction with fig. 2 to 4).
Fig. 2 shows a schematic circuit configuration diagram of a near field communication circuit 200 according to another embodiment of the present application. As shown in fig. 2, the near field communication circuit 200 includes a transmitting antenna 110, a receiving antenna 120, a Near Field Communication (NFC) chip 130, and a signal processing module 140. Wherein: the input end of the transmitting antenna 110 is connected with the output end 130 of the near field communication chip; the output end of the receiving antenna 120 is connected with the input end of the signal processing module 140; the output end of the signal processing module 140 is connected with the input end of the near field communication chip 130; the signal processing module 140 includes a frequency conversion pre-processing sub-module and a frequency converter 143; the transmitting antenna 110 and the receiving antenna 120 realize the transceiving separation; at least one of the transmitting antenna 110 and the receiving antenna 120 is a high-Q antenna, which refers to an antenna having a Q value higher than a predetermined threshold (which may be an art-recognized threshold above which the high-Q antenna is determined).
The near field communication circuit 200 according to the embodiment of the present application is similar in structure to the near field communication circuit 100 described above with reference to fig. 1, except that the near field communication circuit 200 according to the embodiment of the present application has a processing sub-module before frequency conversion compared to the near field communication circuit 100. For brevity, only the newly added pre-conversion processing sub-module is described herein.
In this embodiment, the pre-frequency conversion processing sub-module may be connected between the receiving antenna 120 and the frequency converter 143, that is, an input of the pre-frequency conversion processing sub-module is connected to an output of the receiving antenna 120, and an output of the pre-frequency conversion processing sub-module is connected to an input of the frequency converter 143. The pre-conversion processing sub-module is used for processing the signal received by the receiving antenna 120 before the frequency converter 143, and aims to extract the most effective signal part (e.g. the signal part after noise suppression) from the signal received by the receiving antenna 120 and input the signal part into the frequency converter 143, which can further improve the receiving sensitivity.
In an embodiment of the present application, the processing submodule before frequency conversion may include the first filter 141, that is, an input of the first filter 141 is connected to the output of the receiving antenna 120, and an output of the first filter 141 is connected to an input of the frequency converter 143. The first filter 141 may be used to filter the signal received by the receiving antenna 120 to filter out invalid portions (such as noise) in the signal, thereby improving the receiving sensitivity. In one example, the center frequency of the first filter 141 may be equal to the resonant center frequency of the transmitting antenna 110 to filter out interference of the transmitting-end signal with the receiving-end signal.
In another embodiment of the present application, the processing sub-module before frequency conversion may include an amplifier 142, i.e., an input of the amplifier 142 is connected to the output of the receiving antenna 120, and an output of the amplifier 142 is connected to an input of the frequency converter 143. The amplifier 142 may be used to amplify the signal received by the receiving antenna 120, which is beneficial to amplifying a significant portion of the signal, thereby improving the receiving sensitivity.
In yet another embodiment of the present application, the processing submodule before frequency conversion may include a first filter 141 and an amplifier 142, where the first filter 141 is connected between the receiving antenna 120 and the amplifier 142, and the amplifier 142 is connected between the first filter 141 and the frequency converter 143, that is, the output terminal of the receiving antenna 120 is connected to the input terminal of the first filter 141, the output terminal of the first filter 141 is connected to the input terminal of the amplifier 142, and the output terminal of the amplifier 142 is connected to the input terminal of the frequency converter 143. In this embodiment, it is possible to filter the signal received by the receiving antenna 120 to filter an invalid portion of the signal, and to amplify the filtered signal (an effective signal portion), which is beneficial to amplifying the effective portion of the signal (and does not amplify a noise portion because the noise portion is suppressed or filtered by the first filter 141), so that the receiving sensitivity can be greatly improved.
In one example, the aforementioned first filter 141 may be a notch filter. The notch filter can quickly attenuate an input signal at a certain frequency point so as to achieve a filter effect of blocking the frequency signal from passing through; a notch filter belongs to one of band-stop filters, and its stop band is very narrow. Therefore, the use of the notch filter enables the frequency desired to be suppressed more effectively, thereby further improving the reception sensitivity.
In one example, the aforementioned amplifier 142 may be a low noise amplifier. The low-noise amplifier is an amplifier with very low noise coefficient, and is generally used as a high-frequency or intermediate-frequency preamplifier of various radio receivers and an amplifying circuit of high-sensitivity electronic detection equipment; in the case of amplifying a weak signal, the noise of the amplifier itself may interfere with the signal seriously, and it is desirable to reduce the noise to improve the signal-to-noise ratio of the output. Therefore, the low-noise amplifier can realize effective signal amplification and simultaneously prevent the effective signal from being interfered by self noise, thereby further improving the receiving sensitivity.
Based on the above description, the nfc circuit 200 according to the embodiment of the present application is not limited by bandwidth by using the antennas with separate transmission and reception, and provides a possibility for using the high-quality-factor antenna, so that the transmission power can be increased when the transmission antenna uses the high-quality-factor antenna, the receiving sensitivity can be increased when the receiving antenna uses the high-quality-factor antenna, and both of the antennas can increase the range of the nfc, and when both of the transmission antenna and the receiving antenna use the high-quality-factor antenna, the range of the nfc can be increased by a greater order. In addition, the signal processing module in the near field communication circuit 200 according to the embodiment of the present application includes a frequency conversion pre-processing sub-module, which is capable of extracting the most effective signal part from the signal received by the receiving antenna and inputting the most effective signal part into the frequency converter, which can further improve the receiving sensitivity, thereby further improving the range of the near field communication.
Fig. 3 shows a schematic circuit configuration diagram of a near field communication circuit 300 according to yet another embodiment of the present application. As shown in fig. 3, the near field communication circuit 300 includes a transmitting antenna 110, a receiving antenna 120, a near field communication chip 130, and a signal processing module 140. Wherein: the input end of the transmitting antenna 110 is connected with the output end 130 of the near field communication chip; the output end of the receiving antenna 120 is connected with the input end of the signal processing module 140; the output end of the signal processing module 140 is connected with the input end of the near field communication chip 130; the signal processing module 140 comprises a frequency converter 143 and a frequency conversion post-processing submodule; the transmitting antenna 110 and the receiving antenna 120 realize the transceiving separation; at least one of the transmit antenna 110 and the receive antenna 120 is a high-Q antenna, which refers to an antenna having a Q above a predetermined threshold (which may be an industry-recognized threshold above which the high-Q antenna is determined).
The near field communication circuit 300 according to the embodiment of the present application is similar in structure to the near field communication circuit 100 described above with reference to fig. 1, except that the near field communication circuit 300 according to the embodiment of the present application has a frequency conversion post-processing sub-module added compared to the near field communication circuit 100. For brevity, only the newly added frequency conversion post-processing sub-module is described herein.
The frequency conversion post-processing submodule can be connected between the frequency converter 143 and the near field communication chip 130, that is, the output end of the frequency converter 143 is connected with the input end of the frequency conversion post-processing submodule, and the output end of the frequency converter post-processing submodule is connected with the input end of the near field communication chip 130. The post-frequency conversion sub-module is used for processing the signals output by the frequency converter 143 after the frequency converter 143, so as to input the most effective signal (e.g. the noise-suppressed signal part) of the signals output by the frequency converter 143 into the near-field processing chip, which can further improve the receiving sensitivity.
In an embodiment of the present application, the frequency conversion sub-module may include a second filter 144, that is, an input of the second filter 144 is connected to an output of the frequency converter 143, and an output of the second filter 144 is connected to an input of the near field communication chip 130. The second filter 144 may be used to filter the signal output by the frequency converter 143 to filter out invalid parts (such as noise) in the signal output by the frequency converter 143, so as to further improve the receiving sensitivity.
In one example, the second filter 143 may be a ceramic filter. The ceramic filter is made of lead zirconate titanate ceramic materials, the ceramic materials are made into sheets, silver is coated on two surfaces of the ceramic materials to be used as electrodes, and the ceramic filter has a piezoelectric effect after direct-current high-voltage polarization; the ceramic filter plays a role in filtering, has the characteristics of stability and good anti-interference performance, and is widely applied to various electronic products such as televisions, video recorders, radios and the like as a frequency selection element; it has the advantages of stable performance, no need of regulation, low cost, etc. Therefore, the ceramic filter can be used for filtering the output signal of the frequency converter more stably and in an anti-interference manner, so that the frequency is better selected and then input into the near field communication chip 130.
Based on the above description, the nfc circuit 300 according to the embodiment of the present application is not limited by bandwidth by using the antennas with separate transmission and reception, and provides a possibility for using the high-q antenna, so that the transmission power can be increased when the transmission antenna uses the high-q antenna, the receiving sensitivity can be increased when the receiving antenna uses the high-q antenna, and both of the antennas can increase the range of the nfc, and when both of the transmission antenna and the receiving antenna use the high-q antenna, the range of the nfc can be increased by a greater order. In addition, the signal processing module in the near field communication circuit 300 according to the embodiment of the present application includes a frequency conversion post-processing sub-module, which can process the signal output by the frequency converter, so that the most effective signal in the signal output by the frequency converter is input into the near field processing chip, which can further improve the receiving sensitivity, thereby further improving the operating distance of the near field communication.
Fig. 4 shows a schematic circuit configuration diagram of a near field communication circuit 400 according to yet another embodiment of the present application. As shown in fig. 4, the near field communication circuit 400 includes a transmitting antenna 110, a receiving antenna 120, a Near Field Communication (NFC) chip 130, and a signal processing module 140. Wherein: the input end of the transmitting antenna 110 is connected with the output end 130 of the near field communication chip; the output end of the receiving antenna 120 is connected with the input end of the signal processing module 140; the output end of the signal processing module 140 is connected with the input end of the near field communication chip 130; the signal processing module 140 includes a first filter 141, an amplifier 142, a frequency converter 143, and a second filter 144, wherein an input end of the first filter 141 is connected to an output end of the receiving antenna 120, an output end of the first filter 141 is connected to an input end of the amplifier 142, an output end of the amplifier 142 is connected to an input end of the frequency converter 143, an output end of the frequency converter 143 is connected to an input end of the second filter 144, and an output end of the second filter 144 is connected to an input end of the near field communication chip 130; the transmitting antenna 110 and the receiving antenna 120 realize the transceiving separation; at least one of the transmitting antenna 110 and the receiving antenna 120 is a high-Q antenna, which refers to an antenna having a Q value higher than a predetermined threshold (which may be an art-recognized threshold above which the high-Q antenna is determined).
Near field communication circuit 400 according to an embodiment of the present application combines near field communication circuit 200, described above in connection with fig. 2, and near field communication circuit 300, described above in connection with fig. 3. Thus, it is able to realize the functions of the near field communication circuit 200 and the near field communication circuit 300. The operation of near field communication circuit 400 is described below in conjunction with a specific one of the specific examples, it being understood that the numerical values in this example are exemplary and not limiting.
In one example, the near field communication chip 130 may support the ISO/IEC 14443 protocol, and provide modulation and demodulation and logic operations of Proximity Coupling Devices (PCD) to Proximity Integrated Circuit Cards (PICC) and PICC to PCD radio frequency signals that comply with ISO/IEC 14443 protocol requirements. The modulated signal is transmitted via a transmit antenna 110. The resonant center frequency of the transmitting antenna 110 is, for example, 14.47MHz, and the Q value of the transmitting antenna 110 is, for example, between 30 and 300. The resonance center frequency of the receiving antenna 120 is, for example, 13.56MHz, and the Q value of the receiving antenna 120 is, for example, between 30 and 300. The signal received via the receiving antenna 120 is first input to the first filter 141 having a center frequency of the resonance center frequency (14.47MHz) of the transmitting antenna 110 for filtering, and the first filter 141 provides attenuation of about 30 dB. The attenuated signal is input to amplifier 142 for amplification at a magnification of about 20 dB. The amplified signal enters a frequency converter 143 to down-convert the received signal center frequency to 10.7MHz (the local oscillator in frequency converter 143, which provides the local signal, is not shown). The signal after down-conversion is further filtered by the second filter 144, and the signal at the receiving end is attenuated by about 0dB during the down-conversion of the frequency converter 143 to the second filter 144. The signal is then input to the near field communication chip 130 for demodulation. In general, through high-Q antenna transmission, high-Q antenna reception and subsequent circuit processing such as filtering, amplification, down-conversion and the like, not only is the transmission power improved, but also the sensitivity of a receiving end is greatly improved. Thereby greatly improving the distance of near field communication. Compared with the traditional transmitting antenna, the Q value of the transmitting antenna can be improved by 10-30 times, the transmitting power can be increased by 10-30 times theoretically, and the acting distance of near field communication is increased by 3-5 times. In one example, the range of the near field communication scheme without the near field communication circuit of the present application is 3 cm to 5 cm, and the range of the near field communication scheme with the near field communication circuit of the present application may reach 9 cm to 25 cm. The near field communication circuit can be applied to an application scene that the mobile phone and the vehicle carry out near field communication, such as the situation that the mobile phone is close to a certain part of the vehicle (such as a rearview mirror, a vehicle handle and the like), and automatic unlocking is realized through the near field communication between the mobile phone and the vehicle. Of course, this is merely exemplary, and the near field communication circuit of the present application may also be applied to other near field communication scenarios.
Based on the above description, the nfc circuit according to the embodiment of the present application is not limited by bandwidth by using the antennas separated by transceiving, and provides possibility for using the high-quality-factor antenna, so that the transmission power can be increased when the transmission antenna uses the high-quality-factor antenna, the receiving sensitivity can be increased when the receiving antenna uses the high-quality-factor antenna, and either of the two antennas can increase the range of the nfc circuit, and when both the transmission antenna and the receiving antenna use the high-quality-factor antenna, the range of the nfc circuit can be increased by a larger order. In addition, according to the embodiment of the application, the separation of the transmitting and receiving frequencies can be realized, so that the receiving sensitivity can be further improved, and the action distance of the near field communication can be further improved. Further, the signal processing module in the near field communication circuit according to the embodiment of the present application may include a frequency conversion pre-processing sub-module, which is capable of extracting the most effective signal part from the signal received by the receiving antenna and inputting the most effective signal part into the frequency converter, which may further improve the receiving sensitivity, thereby further improving the range of the near field communication. Further, the signal processing module in the near field communication circuit according to the embodiment of the present application may include a frequency conversion post-processing sub-module, which is capable of processing the signal output by the frequency converter, so that the most effective signal in the signal output by the frequency converter is input into the near field processing chip, which may further improve the receiving sensitivity, thereby further improving the range of the near field communication.
The above exemplarily shows the near field communication circuit according to the embodiment of the present application. According to another aspect of the present application, there is also provided an electronic device, which may include the near field communication circuit according to the embodiments of the present application described above. The structure and function of the near field communication circuit in the electronic device according to the embodiments of the present application can be understood by those skilled in the art in combination with the foregoing description, and therefore, for brevity, detailed description is omitted here.
Although the example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the above-described example embodiments are merely illustrative and are not intended to limit the scope of the present application thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present application. All such changes and modifications are intended to be included within the scope of the present application as claimed in the appended claims.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described device embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the description of exemplary embodiments of the present application, various features of the present application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. However, the method of the present application should not be construed to reflect the intent: this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this application.
It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the present application may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functionality of some of the modules according to embodiments of the present application. The present application may also be embodied as apparatus programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present application may be stored on a computer readable medium or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only for the specific embodiments of the present application or the description thereof, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope disclosed in the present application, and shall be covered by the protection scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A near field communication circuit, comprising a transmit antenna, a receive antenna, a near field communication chip, and a signal processing module, wherein:
the input end of the transmitting antenna is connected with the output end of the near field communication chip, the input end of the near field communication chip is connected with the output end of the signal processing module, the input end of the signal processing module is connected with the output end of the receiving antenna, and the transmitting antenna and the receiving antenna realize transceiving separation;
at least one of the transmitting antenna and the receiving antenna is a high quality factor antenna, which is an antenna with a quality factor higher than a preset threshold.
2. The near field communication circuit of claim 1, wherein the transmit antenna being transceive separated from the receive antenna comprises:
the transmitting antenna is not physically separated from the receiving antenna, and the resonant center frequency of the transmitting antenna is not equal to the resonant center frequency of the receiving antenna; or
The transmitting antenna is physically separated from the receiving antenna, and the resonant center frequency of the transmitting antenna is not equal to the resonant center frequency of the receiving antenna.
3. Near field communication circuit according to claim 1, characterized in that said preset threshold value is equal to 25.
4. The near field communication circuit of claim 1, wherein the signal processing module comprises a frequency converter, an input of the frequency converter is connected to the output of the receiving antenna, and an output of the frequency converter is connected to the input of the near field communication chip.
5. The near field communication circuit of claim 4, wherein the signal processing module further comprises a pre-conversion processing sub-module, an input of the pre-conversion processing sub-module is connected to the output of the receiving antenna, and an output of the pre-conversion processing sub-module is connected to the input of the frequency converter.
6. Near field communication circuit according to claim 5,
the frequency conversion pre-processing submodule comprises a first filter, the input end of the first filter is connected with the output end of the receiving antenna, and the output end of the first filter is connected with the input end of the frequency converter; or
The frequency conversion pre-processing sub-module comprises an amplifier, the input end of the amplifier is connected with the output end of the receiving antenna, and the output end of the amplifier is connected with the input end of the frequency converter.
7. The near field communication circuit of claim 5, wherein the pre-conversion processing sub-module comprises a first filter and an amplifier,
the output end of the receiving antenna is connected with the input end of the first filter;
the output end of the first filter is connected with the input end of the amplifier;
and the output end of the amplifier is connected with the input end of the frequency converter.
8. The near field communication circuit according to claim 4 or 5, wherein the signal processing module further comprises a frequency conversion post-processing sub-module, an input end of the frequency conversion post-processing sub-module is connected to an output end of the frequency converter, and an output end of the frequency conversion post-processing sub-module is connected to an input end of the near field communication chip.
9. The near field communication circuit of claim 8, wherein the post-frequency conversion sub-module comprises a second filter, an input of the second filter is connected to the output of the frequency converter, and an output of the second filter is connected to the input of the near field communication chip.
10. An electronic device, characterized in that the electronic device comprises the near field communication circuit of any of claims 1-9.
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| US20070207744A1 (en) * | 2006-03-02 | 2007-09-06 | Broadcom Corporation, A California Corporation | RFID reader integrated with wireless communication device |
| CN103608827A (en) * | 2011-04-15 | 2014-02-26 | 格马尔托股份有限公司 | Method, circuit, and device for contactless communication with activated transmission |
| CN202513936U (en) * | 2012-01-04 | 2012-10-31 | 华北电网有限公司计量中心 | Test equipment for radio frequency tags |
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