A low-noise primary amplifier circuit and noise decomposition method suitable for a transceiver transducer

Abstract

The present invention discloses a low-noise primary amplifier circuit and a noise decomposition method suitable for a transceiver transducer, which mainly includes a transceiver conversion module, a filter module, and an operational amplifier circuit. The transceiver conversion module is provided with a pair of protection diodes D1, D2, D3, and D4, as well as a resistor R4 and a power inductor L. The filter module includes a resistor R1 and a capacitor C, which form a bandpass filter with the power inductor. The operational amplifier circuit is composed of a low-voltage and current noise amplifier and resistors R2 and R3. The present invention replaces the power resistor of the transceiver conversion module with a power inductor, adjusts and optimizes the RC filter parameters at the input end of the amplifier circuit, thereby eliminating the influence of the power resistor in the original circuit on the noise of the amplifier circuit and the signal receiving efficiency; it can be used for low-noise amplification of active sonar echo signals and circuit noise level evaluation; it improves the signal receiving efficiency; a noise calculation model is established to verify the correctness of the circuit design, which can guide the design of the same type of circuits.