Radio frequency attenuation automatic compensation device

Abstract

The utility model discloses a radio frequency attenuation amount automatic compensation device, particularly relates to the technical field of radio frequency compensation, and is technically characterized in that the device comprises a voltage variable attenuator, a compensation operation module and a compensation control module; the input end of the voltage variable attenuator is connected with the circuit input end, the output end of the voltage variable attenuator is connected with the circuit output end, the control end of the voltage variable attenuator is connected with the output end of the compensation operation module, and the first input end of the compensation operation module is connected with the circuit input end. The second input end of the compensation operation module is connected with the circuit output end, and the third input end of the compensation operation module is connected with the output end of the compensation control module.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency compensation, in particular to an automatic compensation device for radio frequency attenuation. Background Art

[0002] In the field of RF communications, the RF transceiver is a key part of the system. The quality of the RF transceiver determines the quality of the received or sent signal, that is, the quality of the RF system. According to the purpose of the RF system, the RF transceiver has different requirements for the power, frequency, phase and other indicators of the signal passing through it. Among them, the power index is a common RF index, which indicates the amplitude of the signal. Whether it is the RF signal received from the outside world or the RF signal sent to the outside, a suitable power size can avoid signal loss caused by problems such as saturation of the receiving channel or too low signal-to-noise ratio.

[0003] In the prior art, a commonly used method for adjusting the power of RF signals in RF transceiver channels is to use a controller + a digital step RF attenuator, but this method has two shortcomings:

[0004] 1. The minimum step size of the current digital step RF attenuator is 0.5dB / bit, so it is impossible to adjust the signal power with higher precision;

[0005] 2. Since the components used in the RF transceiver have different responses at different temperatures and frequencies, the signal power will fluctuate. At the same time, the frequency of the current signal of the RF transceiver is usually known. Therefore, this method often adopts two solutions to compensate for the signal power fluctuation. One method is to cooperate with the temperature sensor to first measure the signal power value at different temperatures and frequencies, and then adjust the attenuation of the digital step RF attenuator at the corresponding temperature and frequency. Therefore, this method needs to collect a large amount of data at different temperatures and frequencies. The debugging process is cumbersome and time-consuming, and there are many influencing factors. The adjustment of the attenuation is prone to inaccuracy; the other method is to detect the RF signal, obtain the voltage value corresponding to the signal power value, and then convert it into a digital signal with a certain number of bits through ADC and transmit it to the controller. The attenuation of the digital step attenuator is adjusted by the algorithm inside the controller. Compared with the former, although this method does not need to collect a large amount of data, it requires two ADCs to sample the detection analog values ​​of the input signal and the output signal as digital signals and transmit them to the controller. There are more communication lines with the controller, and an adjustment algorithm needs to be written.

[0006] Therefore, the utility model aims to provide a radio frequency attenuation automatic compensation device to solve the above-mentioned related problems. Utility Model Content

[0007] The technical problem to be solved by the utility model is that the existing technology cannot adjust the signal power with high precision, and the existing technology needs to collect a large amount of data or rely on algorithm adjustment to compensate for signal power fluctuations. The purpose is to provide an automatic compensation device for radio frequency attenuation, which is convenient for completing continuous and high-precision adjustment of radio frequency signal power by adopting a voltage variable attenuator; the compensation control module outputs a control voltage based on the attenuation instruction issued by the user, and the compensation operation module obtains the difference between the input signal power voltage value and the output signal power voltage value by collecting and converting the input signal of the input end and the output signal of the output end, and then controls the attenuation of the voltage variable attenuator in combination with the control voltage output by the compensation control module to complete the attenuation of the radio frequency signal, thereby achieving the effect of closed-loop feedback compensation, solving the technical problem that the existing technology needs to collect a large amount of data or rely on algorithm adjustment to compensate for signal power fluctuations.

[0008] The utility model is realized by the following technical solutions:

[0009] A radio frequency attenuation automatic compensation device comprises a voltage variable attenuator, a compensation operation module and a compensation control module; the input end of the voltage variable attenuator is connected to the circuit input end, the output end of the voltage variable attenuator is connected to the circuit output end, the control end of the voltage variable attenuator is connected to the output end of the compensation operation module, the first input end of the compensation operation module is connected to the circuit input end, the second input end of the compensation operation module is connected to the circuit output end, and the third input end of the compensation operation module is connected to the output end of the compensation control module.

[0010] Furthermore, the compensation operation module includes a first signal conversion unit, a second signal conversion unit and an operation unit; the input end of the first signal conversion unit is connected to the circuit input end, the output end of the first signal conversion unit is connected to the first input end of the operation unit, the input end of the second signal conversion unit is connected to the circuit output end, the output end of the second signal conversion unit is connected to the second input end of the operation unit, the third input end of the operation unit is connected to the output end of the compensation control module, and the output end of the operation unit is connected to the control end of the voltage variable attenuator.

[0011] Furthermore, the operation unit includes a first operation subunit, a second operation subunit and a third operation subunit; the first input end of the first operation subunit is connected to the output end of the first signal conversion unit, the second input end of the first operation subunit is connected to the output end of the second signal conversion unit, the output end of the first operation subunit is connected to the first input end of the second operation subunit, the second input end of the second operation subunit is connected to the output end of the compensation control module, the output end of the second operation subunit is connected to the first input end of the third operation subunit, the second input end of the third operation subunit is connected to the output end of the compensation control module, and the output end of the third operation subunit is connected to the control end of the voltage variable attenuator.

[0012] Furthermore, the compensation control module includes a control unit and a control voltage output unit; the output end of the control unit is connected to the input end of the control voltage output unit, the first output end of the control voltage output unit is connected to the second input end of the second operator unit, and the second output end of the control voltage output unit is connected to the second input end of the third operator unit.

[0013] Furthermore, the first signal conversion unit includes a first signal receiving subunit and a first signal conversion subunit; the input end of the first signal receiving subunit is connected to the circuit input end, the output end of the first signal receiving subunit is connected to the input end of the first signal conversion subunit, and the output end of the first signal conversion subunit is connected to the first input end of the first operation subunit.

[0014] Furthermore, the second signal conversion unit includes a second signal receiving subunit and a second signal conversion subunit; the input end of the second signal receiving subunit is connected to the circuit output end, the output end of the second signal receiving subunit is connected to the input end of the second signal conversion subunit, and the output end of the second signal conversion subunit is connected to the second input end of the first operation subunit.

[0015] Furthermore, the first operator unit, the second operator unit and the third operator unit all use operational amplifiers.

[0016] Furthermore, the control unit adopts a controller, and the control voltage output unit adopts one of a digital potentiometer and a digital-to-analog converter.

[0017] Furthermore, the first signal receiving subunit adopts a coupler, and the first signal converting subunit adopts a radio frequency detector.

[0018] Furthermore, the second signal receiving subunit adopts a coupler, and the second signal converting subunit adopts a radio frequency detector.

[0019] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0020] In the utility model, by adopting a voltage variable attenuator, it is convenient to complete continuous and high-precision adjustment of the radio frequency signal power; the compensation control module outputs a control voltage based on the attenuation instruction issued by the user, and the compensation operation module obtains the difference between the input signal power voltage value and the output signal power voltage value by collecting and converting the input signal at the input end and the output signal at the output end, and then controls the attenuation of the voltage variable attenuator in combination with the control voltage output by the compensation control module to complete the attenuation of the radio frequency signal, thereby achieving the effect of closed-loop feedback compensation, solving the technical problem that the prior art needs to collect a large amount of data or rely on algorithm adjustment to compensate for signal power fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 This is a schematic diagram of module connections of a radio frequency attenuation automatic compensation device in this embodiment;

[0023] Figure 2 This is a schematic diagram of the connection of various units in a radio frequency attenuation automatic compensation device in this embodiment;

[0024] Figure 3 Schematic diagram of circuit connection of a radio frequency attenuation automatic compensation device in this embodiment.

[0025] Marks and corresponding parts names in the attached drawings:

[0026] 1. Voltage variable attenuator; 2. Compensation operation module; 3. Compensation control module; 20. First signal conversion unit; 21. Second signal conversion unit; 22. Operation unit; 30. Control unit; 31. Control voltage output unit; 201. First signal receiving subunit; 202. First signal conversion subunit; 211. Second signal receiving subunit; 212. Second signal conversion subunit; 221. First operation subunit; 222. Second operation subunit; 223. Third operation subunit. DETAILED DESCRIPTION

[0027] The following is a description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0028] In the present disclosure, unless otherwise specified, the use of the terms "first", "second", etc. to describe various elements is not intended to limit the positional relationship, timing relationship, or importance relationship of these elements, and such terms are only used to distinguish one element from another element. In some examples, the first element and the second element may refer to the same instance of the element, and in some cases, based on the description of the context, they may also refer to different instances.

[0029] The terms used in the description of various examples in this disclosure are only for the purpose of describing specific examples and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element can be one or more. In addition, the term "and / or" used in this disclosure covers any one of the listed items and all possible combinations.

[0030] Example

[0031] A radio frequency attenuation automatic compensation device comprises a voltage variable attenuator 1, a compensation operation module 2 and a compensation control module 3; the input end of the voltage variable attenuator 1 is connected to the circuit input end, the output end of the voltage variable attenuator 1 is connected to the circuit output end, the control end of the voltage variable attenuator 1 is connected to the output end of the compensation operation module 2, the first input end of the compensation operation module 2 is connected to the circuit input end, the second input end of the compensation operation module 2 is connected to the circuit output end, and the third input end of the compensation operation module 2 is connected to the output end of the compensation control module 3.

[0032] Specifically, in the present embodiment, the model of the voltage variable attenuator 1 is HMC346ALC3B. By adopting the voltage variable attenuator 1, it is convenient to complete the continuous high-precision adjustment of the RF signal power; the compensation control module 3 outputs the control voltage based on the attenuation instruction issued by the user, and the compensation operation module 2 obtains the difference between the input signal power voltage value and the output signal power voltage value by collecting and converting the input signal at the input end and the output signal at the output end, and then controls the attenuation of the voltage variable attenuator 1 in combination with the control voltage output by the compensation control module 3 to complete the attenuation of the RF signal, thereby achieving the effect of closed-loop feedback compensation.

[0033] Furthermore, the compensation operation module 2 includes a first signal conversion unit 20, a second signal conversion unit 21 and an operation unit 22; the input end of the first signal conversion unit 20 is connected to the circuit input end, the output end of the first signal conversion unit 20 is connected to the first input end of the operation unit 22, the input end of the second signal conversion unit 21 is connected to the circuit output end, the output end of the second signal conversion unit 21 is connected to the second input end of the operation unit 22, the third input end of the operation unit 22 is connected to the output end of the compensation control module 3, and the output end of the operation unit 22 is connected to the control end of the voltage variable attenuator 1.

[0034] Specifically, in the present embodiment, the first signal conversion unit 20 is used to facilitate the acquisition of the input signal inputted at the input end of the circuit, and to convert the input signal into an input signal power voltage value; the second signal conversion unit 21 is used to facilitate the acquisition of the output signal outputted at the output end of the circuit, and to convert the output signal into an output signal power voltage value; the operation unit 22 is used to facilitate the acquisition of the input signal power voltage value, the output signal power voltage value, and the control voltage outputted by the compensation control module 3, and output them to the voltage variable attenuator 1 to obtain the required actual attenuation.

[0035] Furthermore, the operation unit 22 includes a first operation subunit 221, a second operation subunit 222 and a third operation subunit 223; the first input end of the first operation subunit 221 is connected to the output end of the first signal conversion unit 20, the second input end of the first operation subunit 221 is connected to the output end of the second signal conversion unit 21, the output end of the first operation subunit 221 is connected to the first input end of the second operation subunit 222, the second input end of the second operation subunit 222 is connected to the output end of the compensation control module 3, the output end of the second operation subunit 222 is connected to the first input end of the third operation subunit 223, the second input end of the third operation subunit 223 is connected to the output end of the compensation control module 3, and the output end of the third operation subunit 223 is connected to the control end of the voltage variable attenuator 1.

[0036] It should be noted that, in this embodiment, the first operator unit 221, the second operator unit 222 and the third operator unit 223 all use operational amplifiers, the model of the operational amplifier used is LM321LV, and the operational amplifier performs addition and subtraction logic operations on the input voltage value to obtain the required compensation value.

[0037] Specifically, in the present embodiment, through the first operator unit 221, it is convenient to utilize the input signal power voltage value output by the first signal conversion unit 20 and the output signal power voltage value output by the second signal conversion unit 21 to obtain the first difference between the input signal power voltage value and the output signal power voltage value, and output the first difference to the second operator unit 222; through the second operator unit 222, it is convenient to utilize the first difference output by the first operator unit 221 and the control voltage output by the compensation control module 3 to obtain the second difference between the first difference and the control voltage, and output the second difference to the third operator unit 223; through the third operator unit 223, it is convenient to utilize the second difference output by the second operator unit 222 and the control voltage output by the compensation control module 3 to obtain the sum of the second difference and the control voltage, and then take the inverse of the sum and output it to the voltage variable attenuator 1;

[0038] Meanwhile, it should be noted that in this embodiment, since the voltage variable attenuator 1 used adopts negative voltage control logic and the control voltage range is -5V-0V, it is necessary to take the inverse of the sum of the second difference and the control voltage.

[0039] Furthermore, the compensation control module 3 includes a control unit 30 and a control voltage output unit 31; the output end of the control unit 30 is connected to the input end of the control voltage output unit 31, the first output end of the control voltage output unit 31 is connected to the second input end of the second operator unit 222, and the second output end of the control voltage output unit 31 is connected to the second input end of the third operator unit 223.

[0040] It should be noted that, in this embodiment, the control unit 30 adopts a controller, the model of which is XC3S200. The controller receives the attenuation instruction sent by the user and converts the attenuation into a control signal of the digital potentiometer. The control voltage output unit 31 adopts a digital potentiometer, the model of which is TPL0501. The digital potentiometer changes its own resistance value according to the control signal sent by the controller, and then outputs the control voltage of the voltage-adjustable variable attenuator 1 to the two operational amplifiers through voltage division.

[0041] Specifically, in the present embodiment, through the control unit 30, it is convenient to receive the attenuation instruction issued by the user, and at the same time convert the attenuation instruction into a control signal and output it to the control voltage output unit 31; through the control voltage output unit 31, it is convenient to change its own resistance value to output the control voltage according to the control signal output by the control unit 30, and output the control voltage to the second operator unit 222 and the third operator unit 223.

[0042] Furthermore, the first signal conversion unit 20 includes a first signal receiving subunit 201 and a first signal conversion subunit 202; the input end of the first signal receiving subunit 201 is connected to the circuit input end, the output end of the first signal receiving subunit 201 is connected to the input end of the first signal conversion subunit 202, and the output end of the first signal conversion subunit 202 is connected to the first input end of the first operation subunit 221.

[0043] Furthermore, the second signal conversion unit 21 includes a second signal receiving subunit 211 and a second signal conversion subunit 212; the input end of the second signal receiving subunit 211 is connected to the circuit output end, the output end of the second signal receiving subunit 211 is connected to the input end of the second signal conversion subunit 212, and the output end of the second signal conversion subunit 212 is connected to the second input end of the first operation subunit 221.

[0044] It should be noted that, in the present embodiment, the first signal receiving subunit 201 and the second signal receiving subunit 211 both use a coupler, the model of the coupler used is ADC-6-1R+, the first signal conversion subunit 202 and the second signal conversion subunit 212 both use a radio frequency detector, the model of the radio frequency detector used is AD8314; the coupler is used to extract a part of the radio frequency signal from the circuit input end or the circuit output end respectively for calculating the attenuation amount to be compensated; the radio frequency detector is used to convert the extracted radio frequency signal into a voltage value for the operational amplifier to calculate the compensation value.

[0045] Specifically, in this embodiment, the first signal receiving subunit 201 is used to collect the input signal input into the input end of the circuit; the first signal conversion subunit 202 is used to convert the input signal into an input signal power voltage value and send it to the first operation subunit 221; the second signal receiving subunit 211 is used to collect the output signal output from the output end of the circuit; the second signal conversion subunit 212 is used to convert the output signal into an output signal power voltage value and send it to the first operation subunit 221.

[0046] At the same time, in this embodiment, a voltage variable attenuator 1 is used to replace the digital step attenuator of the prior art, and the attenuation can be continuously changed with the voltage, which can achieve higher precision adjustment; a controller + coupler + RF detector + operational amplifier + digital potentiometer is used, and there is no need to collect a large amount of data. The controller only has a communication connection with a digital potentiometer, which reduces the number of connections. At the same time, the controller is only used to send the required attenuation value, and no complex algorithm is required;

[0047] At the same time, except for the digital potentiometer, the other devices are analog devices, so the attenuation accuracy of the voltage variable attenuator 1 is only affected by the accuracy of the digital potentiometer. The control bit number of the digital potentiometer is 8 bits, the input voltage is +4V, and the output voltage accuracy is 4 / 2^8=0.015625V / bit. The attenuation value of the variable attenuator is 0~28dB, and the voltage control range is 0~-4V, then the accuracy of the variable attenuator is 28 / 4=7dB / V, so the final attenuation accuracy of the variable attenuator is 0.015625×7=0.109375dB / bit, which is better than the 0.5dB / bit accuracy of the conventional digital step attenuator.

[0048] Working principle: The first signal receiving subunit 201 collects the input signal of the input end of the circuit, the first signal conversion subunit 202 converts the input signal into the input signal power voltage value Vin, and inputs it to the positive input end of the first operator unit 221, the second signal receiving subunit 211 collects the output signal of the output end of the circuit, the second signal conversion subunit 212 converts the output signal into the output signal power voltage value Vout, and inputs it to the negative input end of the first operator unit 221, the first operator unit 221 performs a difference calculation to obtain a first difference (Vout1=Vin-Vout), and outputs the first difference Vout1 to the negative input end of the second operator unit 222, the user inputs the desired attenuation through the control unit 30, and the control unit 30 converts the input attenuation The control signal is sent to the control voltage output unit 31, the control voltage output unit 31 converts the control signal into a control voltage VATT, and outputs it to the positive input terminal of the second operator unit 222 and the negative input terminal of the third operator unit 223 respectively, the second operator unit 222 performs a difference calculation to obtain a second difference (Vout2=VATT-Vout1), and outputs the second difference Vout2 to the negative input terminal of the third operator unit 223, the negative input terminal of the third operator unit 223 performs a sum calculation and takes the opposite value to obtain a final control voltage (Vout3=-(VATT+Vout2)), and outputs the final control voltage to the control terminal of the voltage variable attenuator 1 to control the voltage variable attenuator 1 to change its own attenuation to complete the attenuation of the RF signal.

[0049] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A radio frequency attenuation automatic compensation device, characterized in that: The device includes a voltage variable attenuator, a compensation operation module and a compensation control module; the input end of the voltage variable attenuator is connected to the circuit input end, the output end of the voltage variable attenuator is connected to the circuit output end, the control end of the voltage variable attenuator is connected to the output end of the compensation operation module, the first input end of the compensation operation module is connected to the circuit input end, the second input end of the compensation operation module is connected to the circuit output end, and the third input end of the compensation operation module is connected to the output end of the compensation control module.

2. The radio frequency attenuation automatic compensation device according to claim 1, characterized in that: The compensation operation module includes a first signal conversion unit, a second signal conversion unit and an operation unit; the input end of the first signal conversion unit is connected to the circuit input end, the output end of the first signal conversion unit is connected to the first input end of the operation unit, the input end of the second signal conversion unit is connected to the circuit output end, the output end of the second signal conversion unit is connected to the second input end of the operation unit, the third input end of the operation unit is connected to the output end of the compensation control module, and the output end of the operation unit is connected to the control end of the voltage variable attenuator.

3. The automatic radio frequency attenuation compensation device according to claim 2, characterized in that: The operation unit includes a first operation subunit, a second operation subunit and a third operation subunit; the first input end of the first operation subunit is connected to the output end of the first signal conversion unit, the second input end of the first operation subunit is connected to the output end of the second signal conversion unit, the output end of the first operation subunit is connected to the first input end of the second operation subunit, the second input end of the second operation subunit is connected to the output end of the compensation control module, the output end of the second operation subunit is connected to the first input end of the third operation subunit, the second input end of the third operation subunit is connected to the output end of the compensation control module, and the output end of the third operation subunit is connected to the control end of the voltage variable attenuator.

4. The automatic compensation device for radio frequency attenuation according to claim 3, characterized in that: The compensation control module includes a control unit and a control voltage output unit; the output end of the control unit is connected to the input end of the control voltage output unit, the first output end of the control voltage output unit is connected to the second input end of the second operator unit, and the second output end of the control voltage output unit is connected to the second input end of the third operator unit.

5. The automatic compensation device for radio frequency attenuation according to claim 3, characterized in that: The first signal conversion unit includes a first signal receiving subunit and a first signal conversion subunit; the input end of the first signal receiving subunit is connected to the circuit input end, the output end of the first signal receiving subunit is connected to the input end of the first signal conversion subunit, and the output end of the first signal conversion subunit is connected to the first input end of the first operation subunit.

6. The radio frequency attenuation automatic compensation device according to claim 3, characterized in that: The second signal conversion unit includes a second signal receiving subunit and a second signal conversion subunit; the input end of the second signal receiving subunit is connected to the circuit output end, the output end of the second signal receiving subunit is connected to the input end of the second signal conversion subunit, and the output end of the second signal conversion subunit is connected to the second input end of the first operation subunit.

7. The automatic radio frequency attenuation compensation device according to claim 3, characterized in that: The first operator unit, the second operator unit and the third operator unit all use operational amplifiers.

8. The radio frequency attenuation automatic compensation device according to claim 4, characterized in that: The control unit adopts a controller, and the control voltage output unit adopts a digital potentiometer or a digital-to-analog converter.

9. The radio frequency attenuation automatic compensation device according to claim 5, characterized in that: The first signal receiving subunit adopts a coupler, and the first signal converting subunit adopts a radio frequency detector.

10. The radio frequency attenuation automatic compensation device according to claim 6, characterized in that: The second signal receiving subunit adopts a coupler, and the second signal converting subunit adopts a radio frequency detector.

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