Broadband power amplifier detection circuit and method based on resistance voltage division technology

Abstract

The invention discloses a broadband power amplifier detection circuit and method based on the resistance voltage division technology, and relates to the technical field of radio frequency signal detection, the detection circuit comprises a broadband power amplifier circuit, a resistance voltage division detection circuit and a digital interface board which are connected in sequence, the broadband power amplifier circuit is used for carrying out power amplification on an input radio frequency signal and outputting the amplified radio frequency signal, and the resistance voltage division detection circuit is used for outputting the amplified radio frequency signal. The resistance voltage-dividing detection circuit is used for carrying out voltage division on the amplified radio-frequency signal to obtain a detection signal and adjusting the size of the detection signal, and the digital interface board is used for comparing the voltage of the detection signal with a preset threshold value to obtain the fault condition of the broadband power amplifier circuit. The problem of in-band unevenness of detection in a traditional microstrip coupling mode is solved through the resistance voltage division detection technology, the in-band unevenness of traditional microstrip coupling detection is about 20 dB, the in-band unevenness of the detection method is only 2 dB, the in-band unevenness of a broadband power amplifier detection circuit is greatly improved, the false alarm rate of radio frequency detection is reduced, and the detection efficiency is improved. Therefore, the accuracy of power detection is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency signal detection, and more specifically to a broadband power amplifier detection circuit and method based on resistance voltage division technology. Background Art

[0002] The airborne integrated RF front-end system is required to have a self-test function, in which the power amplifier circuit detects the quality of the channel through the RF detection circuit. At present, based on the increasing integration of the RF front end, the requirements for the multiplexing of the power amplifier path are also getting higher and higher, so the application of broadband power amplifiers is becoming more and more widespread, and its detection circuit also needs to be further optimized.

[0003] At present, the detection circuit of broadband power amplifier generally adopts the method of microstrip coupling line, coupling the normal RF signal to the detection diode, converting it into a low-frequency signal through diode rectification, and then sending it to the digital circuit for detection, so as to realize the circuit self-detection of broadband power amplifier. Among them, digital circuit detection can be realized in two ways. One is that the low-frequency signal passes through the voltage comparator, and the comparator sets the threshold value. If the threshold value is exceeded, the digital circuit reports that the detection is normal, otherwise it reports a detection fault; the other is that the low-frequency signal passes through the digital circuit AD sampling, and the threshold value is also set. If the threshold value is exceeded, the digital circuit reports that the detection is normal, otherwise it reports a detection fault. However, this will bring two aspects of influence. First, the unevenness of the coupling degree of the microstrip coupling line in the wide frequency band can reach 20dB, so the detected signal is uneven within the band; secondly, the large fluctuation within the band of the detection signal makes it impossible to accurately set the threshold of the threshold level, which is easy to cause false alarms or no alarms. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a broadband power amplifier detection circuit and method based on a resistor voltage divider technology to improve the in-band flatness of the broadband power amplifier detection circuit and reduce the false alarm rate of radio frequency detection.

[0005] The objective of the present invention is achieved through the following technical solutions: In a first aspect, a broadband power amplifier detection circuit based on a resistor voltage division technology comprises: a broadband power amplifier circuit, a resistor voltage division detection circuit and a digital interface board connected in sequence, wherein the broadband power amplifier circuit is used to amplify the power of an input radio frequency signal and output it, the resistor voltage division detection circuit is used to divide the amplified radio frequency signal to obtain a detection signal and adjust the magnitude of the detection signal, and the digital interface board is used to compare the detection signal voltage with a preset threshold value to obtain a fault condition of the broadband power amplifier circuit; The resistor voltage divider detection circuit includes a voltage divider resistor R1, a rectifier diode D1 and an RC parallel circuit, one end of the voltage divider resistor R1 is connected to the output end of the broadband power amplifier circuit, the other end of the voltage divider resistor R1 is connected to one end of the RC parallel circuit and the digital interface board through the rectifier diode D1, and the other end of the RC parallel circuit is grounded.

[0006] Preferably, the RC parallel circuit includes a capacitor C1 and a resistor R2 connected in parallel.

[0007] Preferably, the broadband power amplifier circuit comprises a broadband amplifier, a transceiver switch, a receiving circuit and a filter, wherein the broadband amplifier, the transceiver switch and the filter are connected in sequence, and the receiving circuit is connected to the transceiver switch; The broadband amplifier is used to amplify the input radio frequency signal to ensure the output power of the final port, and the transceiver switch is used to switch the transceiver mode; in the transmitting mode, the filter is used to suppress the harmonics and clutter of the transmitted radio frequency signal spectrum to meet the transmitter's index requirements for spectrum characteristics; in the receiving mode, the filter is used to filter the received antenna downlink signal and then output it to the receiving circuit.

[0008] Preferably, the digital interface board includes an isolation driver, a power processing chip, and an embedded processor. The isolation driver is used to receive a detection signal, the power processing chip provides the required voltage for the digital circuit hardware, and the embedded processor is used to compare the detection signal with a preset threshold value and report the status of the broadband power amplifier channel.

[0009] In a second aspect, a broadband power amplifier detection method based on a resistor voltage division technology is applied in the broadband power amplifier detection circuit based on a resistor voltage division technology, comprising: When the broadband power amplifier circuit is working normally, according to the power of full-power transmission and the detection dynamic range of the rectifier diode D1, the resistance value of the voltage divider resistor R1 is adjusted to fix it at a suitable coupling degree, and the RF signal of the main circuit is coupled to the rectifier diode D1. After the rectifier diode D1 rectifies, the RC parallel circuit is adjusted to make the final detection voltage within the withstand voltage range of the isolation drive of the digital interface board; Then, the output power of the broadband power amplifier circuit is reduced to a power value that cannot meet the system requirements, and the detection voltage value at this time is used as the threshold value for digital interface board fault detection; The digital interface board compares the detection signal and the threshold value. When the detection voltage is higher than the set threshold value, the digital interface board reports that the broadband power amplifier is working normally. When the detection voltage is lower than the set threshold value, the digital interface board reports that the broadband power amplifier is faulty.

[0010] The beneficial effects of the present invention are: The broadband power amplifier detection circuit solution based on the resistance voltage division technology provided by the present invention avoids using a microstrip coupling line to perform circuit self-detection of the broadband power amplifier, and solves the problem of in-band unevenness of the traditional microstrip coupling detection through the resistance voltage division detection technology. The in-band unevenness of the traditional microstrip coupling detection is about 20 dB, while the in-band unevenness of the detection method of the present invention is only 2 dB, which greatly improves the in-band flatness of the broadband power amplifier detection circuit, reduces the false alarm rate of radio frequency detection, and thus improves the accuracy of power detection. At the same time, it has the advantages of low cost, simple hardware, miniaturization and high economic value. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A structural block diagram of a broadband power amplifier detection circuit based on a resistor voltage division technology provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0012] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0013] See also Figure 1 , the present invention provides a technical solution: Embodiment 1: A broadband power amplifier detection circuit based on resistor voltage division technology, such as Figure 1 As shown, it includes: a broadband power amplifier circuit, a resistor voltage divider detection circuit and a digital interface board connected in sequence, the broadband power amplifier circuit is used to amplify the power of the input radio frequency signal and output it, the resistor voltage divider detection circuit is used to divide the amplified radio frequency signal to obtain a detection signal, and adjust the size of the detection signal, and the digital interface board is used to compare the detection signal voltage with a preset threshold value to obtain the fault condition of the broadband power amplifier circuit; The resistor voltage divider detection circuit includes a voltage divider resistor R1, a rectifier diode D1 and an RC parallel circuit, one end of the voltage divider resistor R1 is connected to the output end of the broadband power amplifier circuit, the other end of the voltage divider resistor R1 is connected to one end of the RC parallel circuit and the digital interface board through the rectifier diode D1, and the other end of the RC parallel circuit is grounded.

[0014] The RC parallel circuit includes a capacitor C1 and a resistor R2 connected in parallel.

[0015] The broadband power amplifier circuit comprises a broadband amplifier, a transceiver switch, a receiving circuit and a filter, wherein the broadband amplifier, the transceiver switch and the filter are connected in sequence, and the receiving circuit is connected to the transceiver switch; The broadband amplifier is used to amplify the input radio frequency signal to ensure the output power of the final port, and the transceiver switch is used to switch the transceiver mode; in the transmitting mode, the filter is used to suppress the harmonics and clutter of the transmitted radio frequency signal spectrum to meet the transmitter's index requirements for spectrum characteristics; in the receiving mode, the filter is used to filter the received antenna downlink signal and then output it to the receiving circuit.

[0016] The working process of the broadband power amplifier circuit is as follows: the input excitation signal is amplified by the broadband power amplifier, the amplified RF signal is switched to the transmission path through the transceiver switch, and then passes through the filter and is output to the antenna; when receiving, the downlink signal of the antenna passes through the filter and the transceiver switch and is output to the receiving circuit.

[0017] The digital interface board includes an isolation driver, a power processing chip, and an embedded processor. The isolation driver is used to receive a detection signal. The power processing chip provides the required voltage for the digital circuit hardware. The embedded processor is used to compare the detection signal with a preset threshold value and report the status of the broadband power amplifier channel. The embedded processor completes communication with the system through a software program with a detection and reporting function and reports the status of the broadband power amplifier channel.

[0018] Embodiment 2: A broadband power amplifier detection method based on a resistor voltage division technology, applied in the broadband power amplifier detection circuit based on a resistor voltage division technology, comprises: When the broadband power amplifier circuit is working normally, according to the power of full-power transmission and the detection dynamic range of the rectifier diode D1, the resistance value of the voltage divider resistor R1 is adjusted to fix it at a suitable coupling degree, and the RF signal of the main circuit is coupled to the rectifier diode D1. After the rectifier diode D1 rectifies, the RC parallel circuit is adjusted to make the final detection voltage within the withstand voltage range of the isolation drive of the digital interface board; Then, the output power of the broadband power amplifier circuit is reduced to a power value that cannot meet the system requirements, and the detection voltage value at this time is used as the threshold value for digital interface board fault detection; The digital interface board compares the detection signal and the threshold value. When the detection voltage is higher than the set threshold value, the digital interface board reports that the broadband power amplifier is working normally. When the detection voltage is lower than the set threshold value, the digital interface board reports that the broadband power amplifier is faulty.

[0019] The broadband power amplifier detection circuit solution based on the resistance voltage division technology provided by the present invention avoids using a microstrip coupling line to perform circuit self-detection of the broadband power amplifier, and solves the problem of in-band unevenness of the traditional microstrip coupling detection through the resistance voltage division detection technology. The in-band unevenness of the traditional microstrip coupling detection is about 20 dB, while the in-band unevenness of the detection method of the present invention is only 2 dB, which greatly improves the in-band flatness of the broadband power amplifier detection circuit, reduces the false alarm rate of radio frequency detection, and thus improves the accuracy of power detection. At the same time, it has the advantages of low cost, simple hardware, miniaturization and high economic value.

[0020] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A broadband power amplifier detection circuit based on resistance voltage division technology, characterized in that: include: A broadband power amplifier circuit, a resistor voltage divider detection circuit and a digital interface board are connected in sequence, wherein the broadband power amplifier circuit is used to amplify the power of an input radio frequency signal and output it, the resistor voltage divider detection circuit is used to divide the amplified radio frequency signal to obtain a detection signal and adjust the size of the detection signal, and the digital interface board is used to compare the detection signal voltage with a preset threshold value to obtain a fault condition of the broadband power amplifier circuit; The resistor voltage divider detection circuit includes a voltage divider resistor R1, a rectifier diode D1 and an RC parallel circuit, one end of the voltage divider resistor R1 is connected to the output end of the broadband power amplifier circuit, the other end of the voltage divider resistor R1 is connected to one end of the RC parallel circuit and the digital interface board through the rectifier diode D1, and the other end of the RC parallel circuit is grounded.

2. The broadband power amplifier detection circuit based on the resistance voltage division technology according to claim 1, characterized in that: The RC parallel circuit includes a capacitor C1 and a resistor R2 connected in parallel.

3. The broadband power amplifier detection circuit based on resistance voltage division technology according to claim 1, characterized in that: The broadband power amplifier circuit comprises a broadband amplifier, a transceiver switch, a receiving circuit and a filter, wherein the broadband amplifier, the transceiver switch and the filter are connected in sequence, and the receiving circuit is connected to the transceiver switch; The broadband amplifier is used to amplify the input radio frequency signal to ensure the output power of the final port, and the transceiver switch is used to switch the transceiver mode; in the transmitting mode, the filter is used to suppress the harmonics and clutter of the transmitted radio frequency signal spectrum to meet the transmitter's index requirements for spectrum characteristics; in the receiving mode, the filter is used to filter the received antenna downlink signal and then output it to the receiving circuit.

4. The broadband power amplifier detection circuit based on the resistance voltage division technology according to claim 1, characterized in that: The digital interface board includes an isolation driver, a power processing chip, and an embedded processor. The isolation driver is used to receive a detection signal. The power processing chip provides the required voltage for the digital circuit hardware. The embedded processor is used to compare the detection signal with a preset threshold value and report the status of the broadband power amplifier channel.

5. A broadband power amplifier detection method based on resistor voltage division technology, applied in the broadband power amplifier detection circuit based on resistor voltage division technology, characterized in that: include: When the broadband power amplifier circuit is working normally, according to the power of full-power transmission and the detection dynamic range of the rectifier diode D1, the resistance value of the voltage divider resistor R1 is adjusted to fix it at a suitable coupling degree, and the RF signal of the main circuit is coupled to the rectifier diode D1. After the rectifier diode D1 rectifies, the RC parallel circuit is adjusted to make the final detection voltage within the withstand voltage range of the isolation drive of the digital interface board; Then, the output power of the broadband power amplifier circuit is reduced to a power value that cannot meet the system requirements, and the detection voltage value at this time is used as the threshold value for digital interface board fault detection; The digital interface board compares the detection signal and the threshold value. When the detection voltage is higher than the set threshold value, the digital interface board reports that the broadband power amplifier is working normally. When the detection voltage is lower than the set threshold value, the digital interface board reports that the broadband power amplifier is faulty.

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