High-precision radio frequency power control equipment
By introducing a temperature-controlled crystal oscillator, phase-locked loop, analog attenuator, amplifier, and power divider into the RF power control device, and combining it with an FPGA controller and a high-speed converter, the linearity and integration problems of traditional RF AGC control are solved, achieving high-precision signal control and signal-to-noise ratio optimization.
Patent Information
- Application Number
- CN202423157679.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Traditional radio frequency AGC control is difficult to achieve high-precision radio frequency power control, and suffers from linearity, noise figure, and additional noise or distortion problems, and is not easy to integrate.
By using a temperature-controlled crystal oscillator, phase-locked loop, analog attenuator, amplifier and power divider connected in sequence, combined with an FPGA controller and high-speed analog-to-digital and digital-to-analog converters, the FPGA processes the monitoring signal and adjusts the attenuator gain to achieve stable signal control.
It achieves the ability to increase gain to amplify the signal when receiving weak signals and to reduce gain to avoid overload and distortion when receiving strong signals, thus optimizing the dynamic range and signal-to-noise ratio of the RF link and being easy to integrate.
Smart Images
Figure CN223912457U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electronic instrument equipment technical field, concretely relates to a high accuracy radio frequency power control equipment. BACKGROUND
[0002] The ultra-high precision calibration source equipment is mainly composed of constant temperature crystal oscillator, phase-locked loop, analog attenuator, amplifier, isolator, AGC circuit, FPGA controller and the like. The core idea of the radio frequency AGC control is to optimize the system performance through automatic control. The AGC circuit is usually composed of radio frequency detector, ADC analog-digital conversion, VVA analog attenuator, DAC digital-analog conversion, FPGA control circuit and the like. The level of the output signal can be monitored, and the attenuation of the attenuator is adjusted according to the level, so that the stability of the output signal is ensured, and the important indicators such as the accurate control of the output radio frequency signal power are realized.
[0003] The traditional radio frequency AGC control mainly adopts three circuit parts of radio frequency detector, integral loop filter and programmable gain amplifier (PGA), but the traditional radio frequency AGC control has great difficulty in realizing high-precision radio frequency power control design, and cannot solve the problems of linearity, noise coefficient and additional noise or distortion, is unstable and not easy to integrate. CONTENT OF THE UTILITY MODEL
[0004] In view of the above problems, the utility model provides a high accuracy radio frequency power control equipment to provide a stable, easy-to-integrate radio frequency power control equipment.
[0005] The utility model provides a high accuracy radio frequency power control equipment, include: constant temperature crystal oscillator, phase-locked loop, analog attenuator, amplifier and power divider that connect gradually,
[0006] The first output end of the power divider is connected with an output port, and the second output end of the power divider is connected with a detector and an ADC converter in turn.
[0007] The ADC converter is connected with a FPGA controller, one output end of the FPGA controller is connected with the phase-locked loop, another output end of the FPGA controller is connected with a DAC converter, and the DAC converter output end is connected with the analog attenuator.
[0008] In an embodiment, the high accuracy radio frequency power control equipment further comprises a constant temperature device, and the power divider, the detector and the ADC converter are arranged in the constant temperature device.
[0009] In an embodiment, one output end of the FPGA controller is connected with the phase-locked loop through a control circuit to control the phase-locked loop to output a radio frequency signal.
[0010] In one embodiment, the detector is used to measure the amplitude of the power divider transmitted signal, and after detection, a direct current signal is transmitted to the ADC converter to complete the analog-digital conversion.
[0011] In one embodiment, the ADC converter is a high-speed analog-digital converter, which is used to convert the input direct current signal into a digital signal with high precision and transmit it to the FPGA controller.
[0012] In one embodiment, one input end of the FPGA controller is connected with an RS422 control input socket to accept the set target value, another input end of the FPGA controller is connected with the ADC converter, and another output end of the FPGA controller is connected with the DAC converter.
[0013] In one embodiment, the DAC converter is used to receive the digital signal output from another output end of the FPGA controller, and the DAC converter outputs an analog voltage to control the analog attenuator.
[0014] In one embodiment, the analog attenuator is used to adjust the output gain according to the signal size.
[0015] In one embodiment, the DAC converter is a 14-bit high-speed digital-analog converter.
[0016] In one embodiment, the ADC converter is a 16-bit high-speed analog-digital converter.
[0017] Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
[0018] The high-precision radio frequency power control device provided by the utility model relates to: constant temperature crystal oscillator, phase-locked loop, analog attenuator, amplifier and power divider which are connected in sequence, the first output end of the power divider is connected with an output port, the second output end of the power divider is connected with a detector and an ADC converter in sequence, the ADC converter is connected with an FPGA controller, one output end of the FPGA controller is connected with the phase-locked loop, another output end of the FPGA controller is connected with a DAC converter, the DAC converter output end is connected with the analog attenuator, the FPGA controller processes the received digital signal, adjusts the output digital quantity according to the set target value, the FPGA controller outputs the digital signal to the DAC converter to output the analog voltage to control the analog attenuator, the gain is increased to amplify the signal when receiving the weak signal, the gain is reduced to avoid overload and distortion when receiving the strong signal, and therefore the dynamic range and signal-to-noise ratio of the radio frequency link are optimized to adapt to the change of the input signal. BRIEF DESCRIPTION OF DRAWINGS
[0019] The scope of the disclosure can be better understood by reading the following detailed description of exemplary embodiments in conjunction with the accompanying drawings, in which:
[0020] Figure 1 A connection structure block diagram of the high-precision radio frequency power control device is shown.
[0021] Reference signs:
[0022] 1, first control cable; 2, first radio frequency cable; 3, second radio frequency cable; 4, third radio frequency cable; 5, fourth radio frequency cable 5; 6, fifth radio frequency cable; 7, sixth radio frequency cable; 8, second control cable; 9, third control cable; 10, fourth control cable; 11, fifth control cable; 12, 2U standard case; 13, AC 220V input socket; 14, RS422 control input socket; 15, radio frequency output socket; 16, FPGA controller; 17, phase-locked loop; 18, analog attenuator; 19, amplifier; 20, isolator; 21, power divider; 22, detector; 23, ADC converter; 24, DAC converter; 25, thermostat device; 26, AC / DC power module. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will combine the drawings to make the utility model further detailed description, the described embodiment should not be regarded as the limitation to the utility model, all other embodiments obtained by the person skilled in the art without doing the creative labor under the premise, belong to the scope of protection of the utility model.
[0024] In the following description, "some embodiments" are related to a subset of all possible embodiments, but it can be understood that "some embodiments" can be the same subset or different subset of all possible embodiments, and can be combined with each other without conflict.
[0025] If the application file appears "first / second / third" similar description, the following description is added, in the following description, the term "first / second / third" is only to distinguish similar objects, and does not represent the specific order of the object, and it can be understood that "first / second / third" can be exchanged with the specific order or sequence as allowed, so that the utility model embodiments described here can be implemented in an order other than that illustrated or described here.
[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used herein are only for the purpose of describing the utility model embodiments, and are not intended to limit the utility model.
[0027] In the related art, the traditional radio frequency AGC control mainly adopts a radio frequency detector, an integral loop filter and a programmable gain amplifier (PGA) three-part circuit. The integral loop includes a feedback loop and a feedforward loop, wherein the feedback loop has the characteristics of high linearity and stable output signal, but small bandwidth range and slow locking time; the feedforward loop has large bandwidth range and fast locking time, but poor linearity and output signal stability is not as good as the feedback loop. Therefore, it is difficult to design a high-precision radio frequency power control for the traditional radio frequency AGC control.
[0028] The traditional radio frequency AGC is not conducive to expansion in algorithm and is not flexible. The integral loop cannot be used to flexibly control the algorithm to optimize the performance of the entire radio frequency link. There are great design challenges for linearity, noise factor and avoiding additional noise or distortion.
[0029] Based on the problems in the related art, the applicant provides a flexible, stable and easy-to-integrate high-precision radio frequency power control device to increase the gain to amplify the signal when receiving a weak signal, and to reduce the gain to avoid overload and distortion when receiving a strong signal, thereby optimizing the dynamic range and signal-to-noise ratio of the radio frequency link.
[0030] Please refer to Figure 1 , Figure 1 A connection structure block diagram of a high-precision radio frequency power control device is provided for an embodiment, a high-precision radio frequency power control device, comprising a constant temperature crystal oscillator, a phase-locked loop 17, an analog attenuator 18, an amplifier 19 and a power divider 21 connected in sequence, the first output end of the power divider 21 is connected with an output port, the second output end of the power divider 21 is connected with a detector 22 and an ADC converter 23 in sequence, the ADC converter 23 is connected with an FPGA controller 16, one output end of the FPGA controller 16 is connected with the phase-locked loop 17, the other output end of the FPGA controller 16 is connected with a DAC converter 24, and the output end of the DAC converter 24 is connected with the analog attenuator 18.
[0031] One output of the FPGA controller 16 is connected to the phase-locked loop 17 through a control circuit, wherein the phase-locked loop 17 is connected to one output of the FPGA controller 16 through the first control cable 1 to control the phase-locked loop 17 to output a radio frequency signal, the detector 22 is used to measure the amplitude of the signal transmitted by the power divider 21 and transmit a direct current signal after detection to the ADC converter 23 to complete analog-digital conversion, the ADC converter 23 is a high-speed analog-digital converter, which is used to convert the input direct current signal into a digital signal with high precision and transmit the digital signal to the FPGA controller 16, one input of the FPGA controller 16 is connected to the RS422 control input socket 14 to accept a set target value, another input of the FPGA controller 16 is connected to the ADC converter 23, another output of the FPGA controller 16 is connected to the DAC converter 24, the DAC converter 24 is used to receive the digital signal output by another output of the FPGA controller 16, and the DAC converter 24 outputs an analog voltage to control the analog attenuator 18, and the analog attenuator 18 is used to adjust the output gain according to the signal size.
[0032] The constant temperature crystal oscillator outputs a reference signal, which is sent to the phase-locked loop 17 through the first radio frequency cable 2 to perform frequency phase locking and output a target frequency; the phase-locked loop 17 outputs a radio frequency signal, which is sent to the analog attenuator 18 through the second radio frequency cable 3 to adjust the amplitude; the analog attenuator 18 is sent to the amplifier 19 through the third radio frequency cable 4 to amplify the signal; the amplifier 19 is sent to the isolator 20 through the fourth radio frequency cable to effectively isolate the devices in the previous stage; after being processed by the isolator 20, the signal is sent to the power divider 21 through the fifth radio frequency cable 6, one way of the power divider 21 is output to the radio frequency output socket 15 through a port, and the other way is sent to the detector 22 through the sixth radio frequency cable 7; the detector 22 selects to use power detection, which can satisfy the detector 22 to quickly measure the amplitude of the input signal, and output a direct current voltage after detection, which is transmitted to the ADC converter 23 through the second control cable 8 to complete analog-digital conversion; the ADC converter 23 selects a 16BIT high-speed analog-digital converter to convert the input direct current signal into a digital signal with high precision, and transmits the digital signal to the FPGA controller 16 through the third control cable 9; the FPGA controller 16 processes the received digital signal and adjusts the output digital quantity according to the set target value, the FPGA controller 16 outputs a digital signal to the DAC converter 24 through the fourth control cable 10, and the DAC converter 24 outputs an analog voltage to control the VVA analog attenuator 18 through the fifth control cable 11. The DAC converter 24 selects a 14BIT high-speed digital-analog converter, and the reference voltage is 2.5V, which can realize a voltage resolution of 2500 / 2^14≈0.15mv to increase the gain to amplify the signal when receiving a weak signal and reduce the gain to avoid overload and distortion when receiving a strong signal, so as to optimize the dynamic range and signal-to-noise ratio of the radio frequency link.
[0033] In some embodiments, in consideration of ensuring the detection accuracy of the radio frequency signal at full temperature, the fluctuation of the ADC converter 23 is minimal, and the high-precision radio frequency power control device further comprises a constant temperature device 25, the power divider 21, the detector 22 and the ADC converter 23 are arranged in the constant temperature device 25, and are independently designed as cavities and are ensured to work at a constant temperature.
[0034] In some embodiments, the high-precision radio frequency power control device adopts a 2U standard machine box 12, which is conducive to the test platform construction and maintenance of the system.
[0035] It should be noted that the FPGA controller 16 quickly and accurately achieves the target value to adapt to the change of the input signal, and linear algorithm and dichotomy can be used, the linear algorithm is suitable for the case that the signal changes little, and the dichotomy is suitable for the case that the signal changes greatly, and the gain can be adjusted faster to achieve the target power.
[0036] In addition, in the present application, the high-precision radio frequency power control device further comprises an AC / DC power module 26, wherein the AC / DC power module 26 is connected with an AC 220V input socket 13.
[0037] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not deviate from the spirit and scope of the technical solutions of the present application.
[0038] Although the embodiments disclosed in the present application are as above, the content is only the embodiment adopted for the purpose of facilitating the understanding of the present application, and is not used to limit the present application. Any person skilled in the art of the present application can make any modification and change in the implementation form and details without departing from the spirit and scope of the present application disclosed in the present application. However, the protection scope of the present application should be limited by the scope defined in the appended claims.
Claims
1. A high-precision radio frequency power control device, characterized by, The application relates to a constant-temperature signal transmission device. The constant-temperature signal transmission device comprises a constant-temperature crystal oscillator, a phase-locked loop, an analog attenuator, an amplifier and a power divider connected in sequence. An output port is connected to a first output end of the power divider, and a detector and an ADC converter are connected to a second output end of the power divider in sequence. An FPGA controller is connected to the ADC converter, one output end of the FPGA controller is connected to the phase-locked loop, another output end of the FPGA controller is connected to a DAC converter, and an output end of the DAC converter is connected to the analog attenuator.
2. A high precision radio frequency power control device according to claim 1, characterized in that, The power divider, the detector and the ADC converter are arranged in a constant-temperature device.
3. A high precision radio frequency power control device according to claim 1, wherein, One output end of the FPGA controller is connected to the phase-locked loop through a control circuit to control the phase-locked loop to output a radio frequency signal.
4. A high precision radio frequency power control device according to claim 1, wherein, The detector is used for measuring the amplitude of a transmission signal of the power divider and transmitting a direct current signal to the ADC converter after detection to complete analog-digital conversion.
5. A high precision radio frequency power control device according to claim 4, wherein, The ADC converter is a high-speed analog-digital converter and is used for converting the input direct current signal into a digital signal with high precision and transmitting the digital signal to the FPGA controller.
6. A high precision radio frequency power control device according to claim 5, wherein, One input end of the FPGA controller is connected to an RS422 control input socket to accept a set target value, another input end of the FPGA controller is connected to the ADC converter, and another output end of the FPGA controller is connected to the DAC converter.
7. A high precision radio frequency power control device as claimed in claim 1, wherein, The DAC converter is used for receiving a digital signal output from another output end of the FPGA controller, and the DAC converter outputs an analog voltage to control the analog attenuator.
8. A high precision radio frequency power control device according to claim 1, wherein, The analog attenuator is used for adjusting output gain according to signal size.
9. A high precision radio frequency power control device according to any one of claims 1-8, characterized in that, The DAC converter is a 14BIT high-speed digital-analog converter.
10. A high precision radio frequency power control device according to any one of claims 1-8, characterized in that, The ADC converter is a 16BIT high-speed analog-digital converter.