| Summary: | The received signal amplitude of zero-IF Doppler radar usually has a large dynamic range, and this large dynamic range brings inconvenience to signal acquisition. In view of the large dynamic range of this received signal, this paper designs a signal conditioning circuit from the perspective of negative feedback, which includes low noise amplification module, automatic gain control module, non-diode precision rectifier module and subtraction amplifier circuit module; it realizes the function of automatic gain control. After the computer software is simulated, the hardware circuit is fabricated, and the function of the debugging circuit meets the requirements.
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