CN115407105B - Signal detection circuit and radio frequency power detection device - Google Patents
Signal detection circuit and radio frequency power detection deviceInfo
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- CN115407105B CN115407105B CN202211019402.7A CN202211019402A CN115407105B CN 115407105 B CN115407105 B CN 115407105B CN 202211019402 A CN202211019402 A CN 202211019402A CN 115407105 B CN115407105 B CN 115407105B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/16—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using capacitive devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
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Abstract
本申请实施例提供一种信号检测电路以及射频功率检测装置，包括：连接端，用于接收待测电路中的电信号；偏置模块，与连接端连接，用于将接收到的电信号分离成第一信号和第二信号，第一信号为射频信号，第二信号为低频信号和/或直流信号；射频信号检测模块，与偏置模块连接，用于接收第一信号并对第一信号进行检测；信号处理模块，与射频信号检测模块和偏置模块连接，用于接收射频信号检测模块对第一信号的检测结果以及第二信号，并在进行数据处理后获得相应的第一检测结果和第二检测结果；如此，检测范围得到拓展；有利于分析低频信号和/或直流信号的变化以及射频信号的变化的关联性；有利于快速定位故障和辅助调试。
This application provides a signal detection circuit and a radio frequency (RF) power detection device, comprising: a connection terminal for receiving electrical signals from a circuit under test; a bias module connected to the connection terminal for separating the received electrical signals into a first signal and a second signal, wherein the first signal is an RF signal and the second signal is a low-frequency signal and/or a DC signal; an RF signal detection module connected to the bias module for receiving the first signal and detecting the first signal; and a signal processing module connected to the RF signal detection module and the bias module for receiving the detection results of the RF signal detection module on the first signal and the second signal, and obtaining corresponding first and second detection results after data processing. This expands the detection range, facilitates the analysis of the correlation between changes in low-frequency signals and/or DC signals and changes in RF signals, and facilitates rapid fault location and auxiliary debugging.
Description
Technical Field
The present invention relates to the field of signal detection technologies, and in particular, to a signal detection circuit and a radio frequency power detection device.
Background
When debugging products such as rf amplifier circuits, rf signal sources, etc., engineers often need to measure rf power using rf power meters in order to locate a fault point. The radio frequency power meter is designed for measuring various complex waveforms, and is one of the most basic test meters in the development, production and maintenance activities of wireless communication equipment in the installation, maintenance and construction measurement of a mobile communication network.
However, rf power meters have a low frequency lower limit that cannot detect voltage changes below a certain frequency. This results in engineers being unable to analyze the correlation between the change in the low frequency voltage on the line and the change in the radio frequency power, which presents an obstacle for rapid determination of the point of failure.
Disclosure of Invention
Accordingly, an embodiment of the present application provides a signal detection circuit and a radio frequency power detection device for solving at least one of the problems in the background art.
In a first aspect, an embodiment of the present application provides a signal detection circuit, including:
The connecting end is used for receiving the electric signals in the circuit to be tested;
The bias module is connected with the connecting end and is used for separating the received electric signal into a first signal and a second signal, wherein the first signal is a radio frequency signal, and the second signal is a low-frequency signal and/or a direct current signal;
the radio frequency signal detection module is connected with the bias module and is used for receiving the first signal and detecting the first signal;
The signal processing module is connected with the radio frequency signal detection module and the bias module, and is used for receiving the detection result of the radio frequency signal detection module on the first signal and the second signal, and obtaining a corresponding first detection result and a corresponding second detection result after data processing.
With reference to the first aspect of the present application, in an alternative embodiment, the bias module includes a capacitor assembly and a first resistor assembly;
The capacitor component is connected between the connecting end and the radio frequency signal detection module and used for blocking the second signal from flowing to the radio frequency signal detection module;
the first resistor assembly is connected between the connecting end and the radio frequency signal detection module and is used for enabling the second signal to be transmitted to the signal processing module through the first resistor assembly.
With reference to the first aspect of the present application, in an optional implementation manner, a resistance value of the first resistor component is ten times or more than a line characteristic impedance of the signal detection circuit.
In combination with the first aspect of the present application, in an alternative embodiment, the resistance value of the first resistor element is greater than or equal to 500 ohms.
With reference to the first aspect of the present application, in an alternative embodiment, the bias module further includes a second resistor component;
the second resistor assembly is connected between the first resistor assembly and the grounding end.
With reference to the first aspect of the present application, in an alternative embodiment, the second resistor assembly includes a variable resistor network.
In combination with the first aspect of the present application, in an alternative embodiment, an equalizer and/or attenuator is further included, wherein,
The equalizer and/or the attenuator are/is connected to the input end of the radio frequency signal detection module, so that the first signal flows through the equalizer and/or the attenuator and then flows to the radio frequency signal detection module.
With reference to the first aspect of the present application, in an optional implementation manner, the signal processing module is further configured to output the first detection result and the second detection result according to a time correlation of the electrical signal transmission.
With reference to the first aspect of the present application, in an alternative embodiment, the signal processing module includes a first analog-to-digital conversion circuit, a second analog-to-digital conversion circuit, and a microcontroller, wherein,
The first analog-to-digital conversion circuit is connected with the radio frequency signal detection module and is used for converting the detection result of the radio frequency signal detection module on the first signal into a first digital signal and transmitting the first digital signal to the microcontroller;
the second analog-to-digital conversion circuit is connected with the bias module and is used for converting the second signal into a second digital signal and transmitting the second digital signal to the microcontroller;
the microcontroller is connected with the first analog-to-digital conversion circuit and the second analog-to-digital conversion circuit, and is used for determining the corresponding first detection result and second detection result according to the first digital signal and the second digital signal, and outputting the first detection result and the second detection result according to the time relevance of the electric signal transmission.
In a second aspect, an embodiment of the present application provides a radio frequency power detection apparatus, including a signal detection circuit according to any one of the first aspects.
The signal detection circuit and the radio frequency power detection device provided by the embodiment of the application comprise a connecting end, a bias module, a radio frequency signal detection module and a signal processing module, wherein the connecting end is used for receiving an electric signal in a circuit to be detected, the bias module is connected with the connecting end and used for separating the received electric signal into a first signal and a second signal, the first signal is a radio frequency signal, the second signal is a low-frequency signal and/or a direct-current signal, the radio frequency signal detection module is connected with the bias module and used for receiving the first signal and detecting the first signal, the signal processing module is connected with the radio frequency signal detection module and the bias module and used for receiving a detection result of the radio frequency signal detection module and the second signal, and obtaining a corresponding first detection result and a corresponding second detection result after data processing, so that the detection frequency can be reduced to the low-frequency and the direct-current signal, the detection range is expanded, and meanwhile, the change of the low-frequency signal and/or the direct-current signal and the change of the radio frequency signal are collected, so that the relevance between the two signals can be analyzed, and the quick positioning fault and the auxiliary debugging can be facilitated by measuring the two signals.
Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.
Drawings
The accompanying drawings, which are included to provide a further understanding 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 application and do not constitute a limitation on the application. In the drawings:
fig. 1 is a schematic diagram of a signal detection circuit according to an embodiment of the application;
Fig. 2 is a schematic structural diagram of a signal detection circuit according to an embodiment of the present application;
FIG. 3 is a first exemplary architecture diagram of a bias module;
FIG. 4 is a second exemplary architecture diagram of a bias module;
FIG. 5 is a third exemplary architecture diagram of a bias module;
fig. 6 is a fourth exemplary structural schematic of a bias module.
Detailed Description
In order to make the technical solution and the beneficial effects of the present application more obvious and understandable, the technical solution in the embodiments of the present application will be clearly and completely described by way of example only, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the application. Both the first resistor and the second resistor are resistors, but they are not the same resistor. When "first" is described it does not necessarily mean that there is "second", nor when "second" is discussed, it does not mean that there is necessarily a first element, component, region, layer or section of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The meaning of "a plurality of" is two or more, unless specifically defined otherwise. It will be further understood that the terms "comprises" and "comprising," when used in this specification, specify the presence of stated features, but do not preclude the presence or addition of one or more other features. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
It is to be understood that in the context of the present application, "connected" means that the connected end and the connected end have electrical signals or data transferred therebetween, and may be understood as "electrically connected", "communicatively connected", etc. In the context of the present application, "a is directly connected to B" means that no other components than wires are included between a and B.
The embodiment of the application provides a signal detection circuit, and fig. 1 shows a schematic diagram of the structure of the signal detection circuit. The signal detection circuit comprises a connecting end, a bias module, a radio frequency signal detection module and a signal processing module, wherein the connecting end is used for receiving an electric signal in a circuit to be detected, the bias module is connected with the connecting end and used for separating the received electric signal into a first signal and a second signal, the first signal is a radio frequency signal, the second signal is a low-frequency signal and/or a direct-current signal, the radio frequency signal detection module is connected with the bias module and used for receiving the first signal and detecting the first signal, and the signal processing module is connected with the radio frequency signal detection module and the bias module and used for receiving a detection result of the radio frequency signal detection module on the first signal and the second signal and obtaining a corresponding first detection result and a corresponding second detection result after data processing.
Further, the detection of the first signal may specifically be detecting radio frequency power, and the voltage detection of the second signal may specifically be performed after the second signal is received. In the related art, the direct current bias voltage on the radio frequency cable or the circuit cannot be monitored at the same time, and an alternative way is to measure the radio frequency power first and then measure the bias voltage. However, if a fault point needs to be quickly judged in the debugging process, multiple parameters need to be measured simultaneously. The change in the low frequency voltage on the line, if not measured simultaneously with the change in the radio frequency power, can result in a harder investigation of the correlation between the two.
The signal detection circuit provided by the embodiment of the application separates the low-frequency signal and/or the direct-current signal from the radio-frequency signal in the received electric signal by arranging the bias module, so that the detection result for the radio-frequency signal can be obtained, and the low-frequency signal and/or the direct-current signal can be detected, so that the detection frequency can be reduced to low-frequency and direct-current signals, the detection range is expanded, the change of the low-frequency signal and/or the direct-current signal and the change of the radio-frequency signal are collected, the relevance of the low-frequency signal and/or the direct-current signal is favorably analyzed, and the rapid fault positioning and the auxiliary debugging are favorably realized by measuring the two signals at the same time.
The modules in the signal detection circuit provided by the embodiment of the application are positioned in the same instrument, particularly in the radio frequency power detection device, so that more measurement modes are provided in one instrument, and the use cost of a user is reduced.
The radio frequency power detection device can be one of a probe type radio frequency power detection device, a module type radio frequency power detection device or a hand-held radio frequency power detection device. The probe type radio frequency power detection device comprises a radio frequency power probe and a host, and the module type radio frequency power detection device is an independent power measurement module. In order to facilitate rapid fault location and convenient normal operation and use of the user, as a specific implementation manner, the rf power detection device is a handheld rf power detection device. The handheld radio frequency power detection device is convenient to use, small in size and capable of overcoming the work of various debugging and fault points.
In the signal detection circuit provided by the embodiment of the application, the connecting end is used for receiving the electric signal in the circuit to be detected. The connection terminal may specifically include a connector for connecting with an external circuit to be tested. The connector can allow low-frequency signals or direct-current signals to pass through at the same time, and also can allow radio-frequency signals to pass through. The connector can be an N-type connector corresponding to industrial occasions, and can be a common connector such as SMA, 3.5mm, 2.92mm and the like corresponding to common users and occasions with higher frequency. The N-type connector is called a Neill connector, and the SMA connector is called a sub-miniature A-type connector. Further, the connector does not use a waveguide interface. In practical applications, the connector is, for example, a coaxial connector.
After the electric signal in the circuit to be tested enters the signal detection circuit through the connecting end, the electric signal flows to the bias module and is separated into a first signal and a second signal through the bias module. The second signal is a low-frequency signal and/or a direct current signal, and the low-frequency signal can be a low-frequency alternating current-direct current signal, such as an alternating current signal within hundreds of hertz.
The radio frequency signal detection module receives the first signal and detects the first signal. In practical applications, the rf signal detection module is specifically a detector, which is a device for detecting some useful information in the fluctuating signal, and is used to identify the presence or change of waves, oscillations or signals. The detector is used to detect the power of the radio frequency signal (which may be referred to simply as "radio frequency power" in the following part of the description) which can only detect the power of the radio frequency signal above a certain frequency, in particular in the range of 9kHz to 100 kHz.
The signal processing module is used for receiving the detection result of the radio frequency signal detection module on the first signal and the second signal and obtaining a corresponding first detection result and a corresponding second detection result after data processing. As an optional implementation manner, the signal processing module is further configured to output the first detection result and the second detection result according to the time correlation of the electrical signal transmission, so as to facilitate data processing and analysis by a user.
Therefore, the signal detection circuit provided by the embodiment of the application has the advantages of simple structure and reliable performance.
Referring to fig. 2, the bias module may include a retarder. The straight-blocking device is connected between the connecting end and the radio frequency signal detection module. The DC blocker can allow radio frequency signals to pass through in a certain frequency range, and low-frequency direct current signals lower than a certain frequency cannot pass through the DC blocker, so that the radio frequency signal detection module connected to the rear end of the DC blocker cannot be affected. The rear end refers to the rear end of the straight-blocking device, and the radio frequency signal detection module is connected to the rear end of the straight-blocking device according to the flowing direction of the electric signal. Preferably, the dc-blocking device is a broadband radio frequency capacitor. The radio frequency capacitor has a capacity as large as possible and a high frequency performance as high as possible.
The bias module also needs to have a portion that allows low frequency signals and/or direct current signals to pass through. In the specific example shown in fig. 2, this portion is a resistor bias that functions as a core with a resistor. Therefore, after the bias module is arranged, the stability of the radio frequency impedance on the circuit is ensured, and the radio frequency signal is prevented from passing through the resistor bias device.
In contrast, fig. 3 is a schematic diagram of a first exemplary configuration of a bias module, where the bias module includes a capacitor C1 and an inductor L1. The capacitor C1 is used as a straight-blocking device for blocking low-frequency signals and direct-current signals and allowing radio-frequency signals to pass through, and the inductor L1 has the function of allowing the low-frequency signals and/or the direct-current signals to pass through and blocking the radio-frequency signals to pass through. The bias module has small internal resistance and can pass larger current, but the broadband characteristic is difficult to embody and the cost is higher.
It should be noted that when considering how to build the specific structure of the bias module, the inventor notices whether, firstly, the bias module itself will introduce errors, if errors are introduced, the radio frequency power will be changed, so that the user cannot accurately measure the radio frequency power by means of the calibration reading of the radio frequency power meter, secondly, whether to complete the test, different devices such as a multimeter, a radio frequency power meter, a bias device, an adapter wire and the like need to be additionally used, which would cause complicated and complex processes if needed, and thirdly, whether the structure of the part of the bias module allowing the low frequency signal and/or the direct current signal to pass can achieve large bandwidth, high flatness and low frequency, and if so, the application scenario is extremely reduced if it is difficult to achieve.
To avoid the above problems, in the specific example shown in fig. 2, the bias module includes a resistor bias for allowing the low frequency signal and/or the direct current signal to pass through. The bias module comprises a capacitor assembly and a first resistor assembly, wherein the capacitor assembly is connected between the connecting end and the radio frequency signal detection module and used for blocking a second signal from flowing to the radio frequency signal detection module, and the first resistor assembly is connected between the connecting end and the radio frequency signal detection module and used for enabling the second signal to be transmitted to the signal processing module through the resistor assembly. It will be appreciated that the capacitive assembly may be an alternative to a repeater that allows the first signal to flow to the rf signal detection module while blocking the second signal from flowing to the rf signal detection module. And, it is preferable to maintain a good insertion loss characteristic in a wide frequency band so that the loss of the radio frequency signal is as small as possible. The first resistor assembly prevents the first signal from flowing from the branch where the first resistor assembly is located to the signal processing module while enabling the second signal to be transmitted to the signal processing module through the first resistor assembly, so that the loss of the radio frequency signal is reduced.
Further, the resistance value of the first resistor component is more than ten times of the line characteristic impedance of the signal detection circuit. Further, the resistance of the first resistor element may be several tens to hundreds times the line characteristic impedance of the signal detection circuit. The first resistive component and its parasitic impedance determine the port and broadband performance of the line. The resistor bias device in the specific example can obtain good port characteristics and broadband performance, the port characteristics are good, namely the return loss of an input port is small and is close to an ideal state, the broadband performance is good, and therefore radio frequency signals with different frequencies and the same power in an operating frequency band are detected, and the error and fluctuation are small. Therefore, the broadband performance can be optimized by means of reducing parasitic capacitance, inductance, matching with a circuit pattern and the like. The first resistive component may use at least one of a small package resistance, a printed resistance, a coaxial sheet resistance, a line wave impedance tuning match, and the like.
As a specific alternative, the resistance value of the first resistor element is greater than or equal to 500 ohms. In this way, the general requirement of a line characteristic impedance of 50 to 100 ohms (in particular 50 ohms or 75 ohms) can be met. Further optionally, the resistance of the first resistor component is greater than or equal to 1 kiloohm.
The bias module adopts the resistor bias device, has the advantages of convenience in implementation, excellent performance and the like, the influence of power brought by the resistor bias device is very small, the influence on the detection result of the radio frequency signal detection module is greatly reduced, the second signal separated by the bias module is transmitted to the signal processing module to obtain the second detection result, a plurality of detection devices are not needed, the circuit structure is simple, the electric signal transmission error is small, and the large bandwidth, the high flatness and the low frequency can be realized by reasonably setting the resistance value of the first resistor assembly.
The specific structure of the bias module may be referred to fig. 4 to 6.
First, please refer to fig. 4. In a second exemplary configuration of the bias module shown in fig. 4, the bias module includes a capacitive component, such as specifically a first capacitor C1, and a first resistive component, such as specifically a first resistor R1. In addition, the bias module further comprises a second resistor assembly, and the second resistor assembly is connected between the first resistor assembly and the grounding end. The second resistor component is specifically, for example, a second resistor R2. In this way, attenuation of the line dc voltage is achieved by dividing the voltage by the second resistor assembly connected to the ground terminal. The bias module structure shown in fig. 4 uses a low cost, broadband, good-performance resistor network to form the bias voltage measurement circuit.
The first resistor element may include a plurality of resistors in addition to the first resistor R1 shown in fig. 4, and the plurality of resistors may be connected in series, in parallel, or in series-parallel. The total resistance value of the plurality of resistors after being connected forms the resistance value of the first resistor component. In order to further adjust the overall performance of the circuit, a capacitor, an inductor, or the like may be used in the network constituted by the first resistor element.
In a third exemplary structure of the bias module shown in fig. 5, the bias module includes a first-first resistor R11 and a second-first resistor R12, and a first inductor L11, where the first-first resistor R11, the second-first resistor R12, and the first inductor L11 are connected in series between the connection terminal and the radio frequency signal detection module, and the first inductor L11 is connected between the first-first resistor R11 and the second-first resistor R12. Thus, better circuit performance is obtained. The total resistance value of the first-first resistor R11 and the second-first resistor R12 connected in series forms the resistance value of the first resistor component.
In a third exemplary configuration of the bias module shown in fig. 5, a second capacitor C2 is included that is connected between the first resistive component and ground to adjust the performance of the circuit.
Although not shown, the second resistive element may not be present at the position of the second resistive element, and an open circuit, i.e., infinite resistance, may be used at the position of the second resistive element.
As an alternative embodiment, the second resistor assembly may include a plurality of resistors in addition to the second resistor R2 shown in fig. 4, and the plurality of resistors may be connected in series, in parallel, or in series-parallel. In addition, the second resistor assembly can be an assembly with a fixed resistance value, so that the voltage division network with a fixed proportion is formed with the first resistor assembly, and the second resistor assembly can also comprise a variable resistor network, for example, the second resistor assembly is a resistor network with the resistance value capable of being adjusted, so that the voltage division proportion between the second resistor assembly and the first resistor assembly can be changed while the low-frequency input resistance is unchanged.
The resistance value of the second resistor component is not particularly limited, and in practical application, the second resistor component with a proper resistance value can be selected according to the resistance value of the first resistor component and the requirement on the voltage division ratio.
Referring to fig. 6, in a fourth exemplary structure of the bias module shown in fig. 6, the second resistor assembly includes a variable resistor network, and specifically includes three variable resistor branches having three nodes (refer to the first node, the second node, and the third node in the figure) for connection to the signal processing module, respectively. The variable resistor network includes a first-second resistor R21 connected between the first resistor element and the first node, a second-second resistor R22 connected between the first node and the second node, a third-second resistor R23 connected between the second node and the third node, a fourth-second resistor R24 connected between the first node and the ground, a fifth-second resistor R25 connected between the second node and the ground, and a sixth-second resistor R24 connected between the third node and the ground. Thus, when any one of the first node, the second node and the third node is connected with the signal processing module, the variable resistance network provides three different resistance values, so that gear shifting can be realized according to the direct current signal.
It will be understood, of course, that fig. 6 is shown only with a variable resistance network comprising three variable resistance branches, and that the present example obviously also provides a variable resistance network comprising two or more than three variable resistance branches, i.e. a variable resistance network comprising a plurality of variable resistance branches, thereby providing a variety of resistance values for switching.
Next, please continue to refer to fig. 2. The signal detection circuit may further comprise an equalizer and/or an attenuator, wherein the equalizer and/or the attenuator is connected to an input terminal of the radio frequency signal detection module, so that the first signal flows through the equalizer and/or the attenuator and then flows to the radio frequency signal detection module. Therefore, convenience can be provided for users, and the requirement of the users for mathematical calculation of power by using the signal detection circuit/radio frequency power detection device is met. For example, in the case of a signal detection circuit comprising an attenuator, compensation can be performed digitally on the measurement, and, for example, a fourier transform can be run when there is a need to obtain fluctuations in radio frequency power over time. The equalizer and/or attenuator module can optimize radio frequency standing waves and overall power response, and can provide more accurate data and port performance for users and adjust overall performance.
Optionally, frequency amplitude equalization is performed by loss of the transmission line. The length of the transmission line is such that a uniform attenuation increase from low to high frequencies can be obtained. The loss of the transmission line comes from radiation loss caused by the structure, loss caused by engineering medium, processing error and loss caused by process precision. With these loss and frequency dependent characteristics, a uniform increase in attenuation from low to high frequency is obtained by adjusting the length of the transmission line. If the slope of the attenuation increase is matched with the detection response of the radio frequency signal detection module, flatter response can be realized, and the influence of accuracy brought by frequency is reduced. The transmission line can be a microstrip line, a coplanar waveguide, a coplanar grounded waveguide, a coaxial line, a waveguide cavity and other electromagnetic waveguide structures.
Next, please continue to refer to fig. 2. The signal processing module comprises a first analog-to-digital conversion circuit, a second analog-to-digital conversion circuit and a microcontroller, wherein the first analog-to-digital conversion circuit is connected with the radio frequency signal detection module and is used for converting a detection result of the radio frequency signal detection module on a first signal into a first digital signal and then transmitting the first digital signal to the microcontroller, the second analog-to-digital conversion circuit is connected with the biasing module and is used for converting a second signal into a second digital signal and then transmitting the second digital signal to the microcontroller, and the microcontroller is connected with the first analog-to-digital conversion circuit and the second analog-to-digital conversion circuit and is used for determining a corresponding first detection result and a corresponding second detection result according to the first digital signal and the second digital signal and outputting the first detection result and the second detection result according to time relevance of electric signal transmission.
In the signal detection circuit, if a direct current low frequency signal (such as a DC-9KHz signal) and a radio frequency signal (such as a 9KHz-6GHz signal) exist on the circuit at the same time, the direct current low frequency signal can be converted into a digital signal through a resistor bias device by a second analog-to-digital conversion circuit, and then enters a microcontroller, and the waveform and the value of the direct current low frequency signal can be processed in the microcontroller and finally displayed to a user. Meanwhile, the radio frequency signal is converted into a digital signal through the radio frequency signal detection module and then enters the microcontroller for further calculation and processing, and the radio frequency power can be displayed to a user in the form of waveforms or numerical values, but is not limited to being displayed in the form of numerical values. Therefore, the user can quickly obtain the direct-current low-frequency and radio-frequency power information through one-time connection, one-time measurement and one screen.
The microcontroller can carry out mathematical calculation (such as addition, subtraction, multiplication and division and Fourier transformation) and recording on the radio frequency power and the direct current low frequency signal, can also display the fluctuation condition of the radio frequency power along with time, and can display the fluctuation of the radio frequency power and the fluctuation time of the direct current low frequency signal after being correlated.
The first analog-to-digital conversion circuit samples the voltage output by the radio frequency signal detection module and converts the voltage into a digital signal. The microcontroller can perform data processing according to the corresponding relation of the voltage, the frequency and the power to obtain the radio frequency power. Here, the rf power is the first detection result. As an alternative implementation mode, the microcontroller determines a corresponding first detection result according to the first digital signal, and the method comprises the steps of obtaining radio frequency power corresponding to the first digital signal based on a calibration obtaining table to determine the first detection result, wherein the calibration obtaining table comprises the corresponding relation between voltage and power. As another alternative implementation manner, the microcontroller determines a corresponding first detection result according to the first digital signal, wherein the first detection result is determined by calculating radio frequency power based on a formula among voltage, frequency and power, the first digital signal contains voltage information, and the frequency information of the radio frequency signal can be obtained based on input operation of a user.
On the basis, the embodiment of the application also provides a radio frequency power detection device which comprises the signal detection circuit in any one of the previous embodiments.
It can be appreciated that the signal detection circuit and the radio frequency power detection device provided by the application can measure radio frequency power, can measure a low frequency signal and a direct current signal, can measure the radio frequency power, the low frequency signal and the direct current signal at the same time, can realize gear shifting according to the direct current signal, can display, process and analyze the two signals, can calibrate, compensate and record the power of the radio frequency signal, calibrate, compensate and record the low frequency signal and the direct current signal, and analyze and display the time correlation of the low frequency, the direct current and the radio frequency power.
It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the invention which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present invention and do not limit the scope of protection of the patent of the present invention.
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