Microwave receiving module

Abstract

The utility model provides a microwave receiving module, which relates to the technical field of signal processing, and comprises a VGC control temperature compensation circuit, the VGC control temperature compensation circuit comprises a voltage-controlled amplifier and a temperature sensor, and the input end and the output end of the voltage-controlled amplifier are respectively connected with an amplitude-limiting low-noise amplification filter circuit and a noise control circuit. The power supply end of the voltage-controlled amplifier is connected with the voltage conversion circuit, and the temperature sensor is connected with the control voltage input end of the voltage-controlled amplifier through the signal processing circuit. The problem of gain fluctuation caused by electrical characteristic change of active devices such as a transistor and an amplifier chip in the VGC amplification control circuit due to temperature change is effectively solved, the control voltage of the voltage-controlled amplifier is dynamically adjusted, and the voltage-controlled amplifier can stably work at different temperatures; therefore, the gain stability of the whole microwave receiving module is improved, and the signal amplification effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of signal processing technology, and more specifically, to a microwave receiving module. Background Technology

[0002] Microwave receiver modules are key components of modern communication and radar systems. Their main function is to receive microwave signals and convert them into electrical signals suitable for subsequent processing. A typical module consists of an antenna, a low-noise amplifier (LNA), a mixer, filters, and an intermediate frequency (IF) amplifier. The antenna captures the microwave signal, the LNA amplifies the weak signal initially while minimizing noise introduction, and the mixer converts the high-frequency microwave signal to an intermediate frequency (IF) or fundamental frequency for easier processing. Filters remove unwanted frequency band components, and the IF amplifier further amplifies the filtered signal to meet the system's signal strength requirements.

[0003] Microwave receiver modules face problems caused by temperature changes in practical applications. The electrical characteristics of active devices in the VGC amplification control circuit, such as transistors and amplifier chips, change with temperature, which leads to fluctuations in circuit gain, affects signal amplification, and seriously restricts the performance and stability of microwave receiver modules. Utility Model Content

[0004] The purpose of this invention is to address the problems in the prior art by providing a microwave receiving module that incorporates a VGC-controlled temperature compensation circuit.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a microwave receiving module, including a signal receiving device, a limiting low noise amplification and filtering circuit, a VGC control temperature compensation circuit, a noise control circuit, a logarithmic amplification and detection circuit, and a signal output device connected in sequence. The microwave receiving module also includes a voltage conversion circuit, which is connected to the limiting low noise amplification and filtering circuit, the VGC control temperature compensation circuit, and the logarithmic amplification and detection circuit respectively to provide voltages respectively.

[0007] The VGC-controlled temperature compensation circuit includes a voltage-controlled amplifier and a temperature sensor. The signal input terminal of the voltage-controlled amplifier is connected to the limiting low-noise amplification and filtering circuit, the signal output terminal of the voltage-controlled amplifier is connected to the noise control circuit, the power supply terminal of the voltage-controlled amplifier is connected to the voltage conversion circuit, and the temperature sensor is connected to the control voltage input terminal of the voltage-controlled amplifier through a signal processing circuit.

[0008] Optionally, the limiting low-noise amplifier and filter circuit includes a limiting low-noise amplifier, a filter, a mixer and a first intermediate frequency filter connected in sequence. The signal input terminal of the limiting low-noise amplifier is connected to the signal receiving device, and the first intermediate frequency filter is connected to the signal input terminal of the voltage-controlled amplifier.

[0009] The power supply terminal of the limiting low-noise amplifier is connected to the voltage conversion circuit, the LO terminal of the mixer is connected to the local oscillator, and the power supply terminal of the local oscillator is connected to the voltage conversion circuit.

[0010] Optionally, the noise control circuit includes a second intermediate frequency filter, the signal input terminal of which is connected to the signal output terminal of the voltage-controlled amplifier; the logarithmic amplification and detection circuit includes a logarithmic amplification filter, the signal input terminal of which is connected to the signal output terminal of the second intermediate frequency filter, the signal output terminal of which is connected to the signal output device, and the power supply terminal of which is connected to the voltage conversion circuit.

[0011] Optionally, the temperature sensor is mounted in conjunction with the voltage-controlled amplifier.

[0012] Optionally, the microwave receiving module further includes a current feedback circuit, which is connected to the signal output device and the signal processing circuit respectively, and is also connected to the voltage conversion circuit.

[0013] Optionally, the signal processing circuit includes an operational amplifier and a current amplifier connected in sequence;

[0014] The non-inverting input of the operational amplifier is connected to the temperature sensor via a signal processor; the output of the operational amplifier is connected to the signal input of the current amplifier; the inverting input of the operational amplifier is connected to the current feedback circuit; and the power supply of the operational amplifier is connected to the voltage conversion circuit.

[0015] The power supply terminal of the current amplifier is connected to the voltage conversion circuit, and the signal output terminal of the current amplifier is connected to the control voltage input terminal of the operational amplifier.

[0016] Optionally, the current feedback circuit includes a root mean square (RMS) detector, the input terminal of which is connected to the signal output device, the output terminal of which is connected to the inverting input terminal of the operational amplifier, and the power supply terminal of which is connected to the voltage conversion circuit.

[0017] The beneficial effects that this utility model can produce include:

[0018] By introducing a VGC (Voltage Controlled Amplifier) ​​temperature compensation circuit into the microwave receiver module, the gain fluctuation problem caused by changes in the electrical characteristics of active components such as transistors and amplifier chips in the VGC amplification control circuit due to temperature variations is effectively solved. The temperature sensor can monitor temperature changes in real time and transmit the signal to the signal processing circuit, which then dynamically adjusts the control voltage of the voltage-controlled amplifier. This ensures that the voltage-controlled amplifier can operate stably at different temperatures, thereby improving the gain stability of the entire microwave receiver module, enhancing signal amplification, and improving the performance and stability of the microwave receiver module, enabling it to operate reliably in various temperature environments. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a microwave receiving module provided in an embodiment of this application.

[0021] Icons: 1. Voltage conversion circuit; 2. Limiting low-noise amplifier; 3. Filter; 4. Mixer; 5. Local oscillator; 6. First intermediate frequency filter; 7. Voltage-controlled amplifier; 8. Second intermediate frequency filter; 9. Logarithmic amplifier filter; 10. Signal output device; 11. Operational amplifier; 12. Current amplifier; 13. Root mean square detector; 14. Signal processor; 15. Temperature sensor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of this application. It should be noted that, without conflict, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0023] like Figure 1As shown, this application provides a microwave receiving module, including a signal receiving device, a limiting low-noise amplifier and filter circuit, a VGC control temperature compensation circuit, a noise control circuit, a logarithmic amplifier and detector circuit, and a signal output device 10 connected in sequence. It also includes a voltage conversion circuit 1, which is connected to the limiting low-noise amplifier and filter circuit, the VGC control temperature compensation circuit, and the logarithmic amplifier and detector circuit to provide voltages respectively. The VGC control temperature compensation circuit includes a voltage-controlled amplifier 7 and a temperature sensor 15. The signal input terminal of the voltage-controlled amplifier 7 is connected to the limiting low-noise amplifier and filter circuit, the signal output terminal of the voltage-controlled amplifier 7 is connected to the noise control circuit, and the power supply terminal of the voltage-controlled amplifier 7 is connected to the voltage conversion circuit 1. The temperature sensor 15 is connected to the control voltage input terminal of the voltage-controlled amplifier 7 through a signal processing circuit. The microwave receiving module also includes a current feedback circuit, which is connected to the signal output device 10 and the signal processing circuit, and is also connected to the voltage conversion circuit 1.

[0024] The limiting low-noise amplifier and filter circuit includes a limiting low-noise amplifier 2, a filter 3, a mixer 4, and a first intermediate frequency filter 6 connected in sequence. The signal input terminal of the limiting low-noise amplifier 2 is connected to a signal receiving device, and the first intermediate frequency filter 6 is connected to the signal input terminal of a voltage-controlled amplifier 7. The power supply terminal of the limiting low-noise amplifier 2 is connected to a voltage conversion circuit 1, and the LO terminal of the mixer 4 is connected to a local oscillator 5. The power supply terminal of the local oscillator 5 is also connected to the voltage conversion circuit 1. The noise control circuit includes a second intermediate frequency filter 8, the signal input terminal of which is connected to the signal output terminal of the voltage-controlled amplifier 7. The logarithmic amplification and detection circuit includes a logarithmic amplification filter 9, the signal input terminal of which is connected to the signal output terminal of the second intermediate frequency filter 8, the signal output terminal of which is connected to a signal output device, and the power supply terminal of the logarithmic amplification filter 9 is connected to the voltage conversion circuit 1. The signal processing circuit includes an operational amplifier 11 and a current amplifier 12 connected in sequence. The non-inverting input of the operational amplifier 11 is connected to the temperature sensor 15 via a signal processor 14. The output of the operational amplifier 11 is connected to the signal input of the current amplifier 12. The inverting input of the operational amplifier 11 is connected to a current feedback circuit. The power supply of the operational amplifier 11 is connected to a voltage conversion circuit 1. The power supply of the current amplifier 12 is connected to the voltage conversion circuit 1, and the signal output of the current amplifier 12 is connected to the control voltage input of the operational amplifier 11. The current feedback circuit includes a root-mean-square (RMS) detector 13. The input of the RMS detector 13 is connected to a signal output device 10, the output of the RMS detector 13 is connected to the inverting input of the operational amplifier 11, and the power supply of the RMS detector 13 is connected to the voltage conversion circuit 1. The temperature sensor 15 is mounted in contact with the voltage-controlled amplifier 7.

[0025] like Figure 1As shown, voltage conversion circuit 1 uses a multi-channel low-dropout linear regulator to output +5V and +10V voltages respectively; +5V powers the limiting low-noise amplifier 2, mixer 4, local oscillator 5, root mean square detector 13, operational amplifier 11, and logarithmic amplifier filter 9; +10V powers the voltage-controlled amplifier 7 and current amplifier 12.

[0026] EX ANT is the antenna input terminal. The microwave signal received by the antenna is transmitted to the limiting low-noise amplifier 2 via the signal receiving device. Its threshold is set to -20dBm to suppress strong signal overload. Filter 3 is a bandpass filter with a center frequency of 2.4GHz and a bandwidth of ±50MHz to filter out out-of-band interference. Mixer 4 works in conjunction with local oscillator 5. The local oscillator output frequency is 2.3GHz, which downconverts the 2.4GHz signal to a 100MHz intermediate frequency signal. The first intermediate frequency filter 6 is a surface acoustic wave (SAW) filter to further filter out spurious components after mixing.

[0027] VGC temperature compensation circuit: Temperature sensor 15 is a surface-mount negative temperature coefficient (NTC) thermistor, which is attached to the housing of voltage-controlled amplifier 7 with thermally conductive adhesive to monitor its operating temperature in real time; Signal processing circuit: The output signal of temperature sensor 15 is converted from analog to digital by signal processor 14 (model ADuCM360) and the temperature compensation coefficient is calculated; Operational amplifier 11 (model OPA2188) generates a 0-5V control voltage according to the compensation coefficient, which drives the gain control terminal of voltage-controlled amplifier 7 through current amplifier 12 (current gain is 10 times); Voltage-controlled amplifier 7 uses wideband voltage-controlled gain chip HMC985A, and the linearity error of the control voltage is <1%.

[0028] Noise control and output stage: The second intermediate frequency filter 8 adopts an LC filter with a cutoff frequency of 10MHz to suppress high-frequency noise; the logarithmic amplifier filter 9 uses an AD8310 chip, and the output signal is detected by the root mean square detector 13 (model LT5581) and then fed back to the compensation terminal of the operational amplifier 11.

[0029] Temperature compensation implementation process: 1. Temperature signal acquisition: Temperature sensor 15 acquires the surface temperature of voltage-controlled amplifier 7 in real time. The output resistance value changes with temperature (e.g., the resistance is 10kΩ at 25℃, and the resistance decreases by 5% for every 1℃ increase). Signal processor 14 converts the resistance value into a voltage signal through a voltage divider circuit and samples it through the built-in ADC (sampling rate 1kHz) to calculate the current temperature value. 2. Gain compensation calculation: A preset temperature-gain compensation table is used. The gain of voltage-controlled amplifier 7 needs to be increased linearly to offset temperature drift. Signal processor 14 generates a compensation voltage value based on the current temperature by looking up the table and transmits it to operational amplifier 11 through the SPI interface. 3. Dynamic gain adjustment: Operational amplifier 11 converts the digital compensation signal into an analog control voltage (e.g., the control voltage increases by 0.1V for every 1℃ increase in temperature). Current amplifier 12 increases the drive current of the control voltage from 10mA to 100mA to ensure that the gain adjustment response time of voltage-controlled amplifier 7 is <1ms.

[0030] Calibration feedback: Output signal monitoring. The root mean square detector 13 detects the power level of the signal output device 10 in real time. If the output power exceeds the preset range, a calibration signal is triggered. The calibration signal is transmitted to the compensation terminal of the operational amplifier 11 through the current feedback circuit to adjust its bias current and dynamically correct the control voltage.

[0031] This embodiment of the application effectively solves the gain fluctuation problem caused by changes in the electrical characteristics of active devices such as transistors and amplifier chips in the VGC amplification control circuit due to temperature variations by introducing a VGC control temperature compensation circuit into the microwave receiving module. The temperature sensor 15 can monitor temperature changes in real time and transmit the signal to the signal processing circuit, thereby dynamically adjusting the control voltage of the voltage-controlled amplifier 7. This ensures that the voltage-controlled amplifier 7 can operate stably at different temperatures, thereby improving the gain stability of the entire microwave receiving module, enhancing the signal amplification effect, and improving the performance and stability of the microwave receiving module, enabling it to operate reliably in different temperature environments.

[0032] An example of adaptive compensation in this application embodiment: When a sudden change in ambient temperature causes a decrease in output power, the root mean square detector 13 detects an abnormal power, and the feedback signal increases the voltage at the compensation terminal of the operational amplifier 11 by 0.3V. The gain of the voltage-controlled amplifier 7 is then increased, restoring the output signal to the rated range.

[0033] The embodiments of this application are applicable to: satellite communication terminals that stably receive Ku-band signals in outdoor environments with large day-night temperature differences; vehicle-mounted radar systems that adapt to the high-temperature environment of engine compartments and ensure target detection accuracy; and 5G millimeter-wave base stations that maintain channel balance in dense equipment heat dissipation scenarios.

[0034] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A microwave receiving module, comprising a signal receiving device, a limiting low-noise amplification and filtering circuit, a VGC-controlled temperature compensation circuit, a noise control circuit, a logarithmic amplification and detection circuit, and a signal output device (10) connected in sequence, characterized in that: The microwave receiving module further includes a voltage conversion circuit (1), which is connected to the limiting low noise amplification and filtering circuit, the VGC control temperature compensation circuit and the logarithmic amplification and detection circuit respectively to provide voltage respectively; The VGC control temperature compensation circuit includes a voltage-controlled amplifier (7) and a temperature sensor (15). The signal input terminal of the voltage-controlled amplifier (7) is connected to the limiting low-noise amplification and filtering circuit, the signal output terminal of the voltage-controlled amplifier (7) is connected to the noise control circuit, the power supply terminal of the voltage-controlled amplifier (7) is connected to the voltage conversion circuit (1), and the temperature sensor (15) is connected to the control voltage input terminal of the voltage-controlled amplifier (7) through a signal processing circuit.

2. The microwave receiving module according to claim 1, characterized in that, The limiting low noise amplifier and filter circuit includes a limiting low noise amplifier (2), a filter (3), a mixer (4) and a first intermediate frequency filter (6) connected in sequence. The signal input terminal of the limiting low noise amplifier (2) is connected to the signal receiving device, and the first intermediate frequency filter (6) is connected to the signal input terminal of the voltage-controlled amplifier (7). The power supply terminal of the limiting low noise amplifier (2) is connected to the voltage conversion circuit (1), the LO terminal of the mixer (4) is connected to the local oscillator (5), and the power supply terminal of the local oscillator (5) is connected to the voltage conversion circuit (1).

3. The microwave receiving module according to claim 2, characterized in that, The noise control circuit includes a second intermediate frequency filter (8), the signal input terminal of which is connected to the signal output terminal of the voltage-controlled amplifier (7); the logarithmic amplification and detection circuit includes a logarithmic amplification filter (9), the signal input terminal of which is connected to the signal output terminal of the second intermediate frequency filter (8), the signal output terminal of which is connected to the signal output device, and the power supply terminal of which is connected to the voltage conversion circuit (1).

4. The microwave receiving module according to claim 1, characterized in that, The temperature sensor (15) is attached to the voltage-controlled amplifier (7).

5. The microwave receiving module according to claim 1, characterized in that, The microwave receiving module further includes a current feedback circuit, which is connected to the signal output device (10) and the signal processing circuit respectively, and is also connected to the voltage conversion circuit (1).

6. The microwave receiving module according to claim 5, characterized in that, The signal processing circuit includes an operational amplifier (11) and a current amplifier (12) connected in sequence; The non-inverting input of the operational amplifier (11) is connected to the temperature sensor (15) through the signal processor (14), the output of the operational amplifier (11) is connected to the signal input of the current amplifier (12), the inverting input of the operational amplifier (11) is connected to the current feedback circuit, and the power supply of the operational amplifier (11) is connected to the voltage conversion circuit (1). The power supply terminal of the current amplifier (12) is connected to the voltage conversion circuit (1), and the signal output terminal of the current amplifier (12) is connected to the control voltage input terminal of the operational amplifier (11).

7. The microwave receiving module according to claim 6, characterized in that, The current feedback circuit includes a root mean square detector (13), the input terminal of which is connected to the signal output device (10), the output terminal of which is connected to the inverting input terminal of the operational amplifier (11), and the power supply terminal of which is connected to the voltage conversion circuit (1).

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