Design of signal conditioning circuit for sonar receiver with strong anti-interference ability

This paper mainly introduces a sonar receiver signal conditioning circuit, mainly including the front impedance matching circuit, two-stage differential filter amplifier circuit, variable gain amplifier circuit. Circuits at all levels in the design of the low noise program, the use of full differential circuit form, improve the receiving system noise resistance. Circuit using the appropriate combination of structure, optimization of PCB wiring, the design of the four-channel signal conditioning circuit PCB size of 4.1cm × 2.7cm. Finally, the circuit is physically tested, the results show that the design specifications in line with the requirements. Can effectively docking retrieved hydroacoustic target signal amplification, filtering, noise reduction and other conditioning.