Analysis and design of a weak charge signal amplifier circuit

In view of the difficulties in adjusting the weak charge signal generated by the piezoelectric plate-meter in the process of plate-shape detection and the limitations of the traditional charge amplifier due to its large size, a weak charge signal amplifying circuit was designed, which has the advantages of small size, high integration, strong anti-interference ability and good economy. The Multisim simulation and the actual circuit test show that the circuit has a good flatness in the passband, the amplitude of the output signal and the theoretical error is less than 2%, and the sensitivity is easy to adjust, which verifies the feasibility and reliability of the circuit.