Integrator error compensation method in charge sensitive amplifier and device thereof

摘要

According to the present invention, there is provided a circuit having a function of compensating for an integrator error of a charge amplifier, wherein a small circuit which can be integrated with a piezoelectric sensor can be constituted by minimizing component parts, A method and an apparatus for compensating an integrator error of a charge amplifier are disclosed. The integrator error compensation apparatus of the disclosed charge amplifier includes an integrator error compensation circuit for amplifying and outputting a positive voltage signal proportional to a charge signal to positive and negative charge signals Q output from a piezoelectric sensor, An adder (V1) for receiving a charge signal (Q) from the piezoelectric sensor and amplifying the same and outputting the amplified charge signal as a primary voltage signal (Vo1); A second amplification unit (V2) receiving the first voltage signal (Vo1) output from the adder (V1) and amplifying it secondarily and outputting it as a second voltage signal (Vo2); A comparator V5 for receiving the secondary voltage signal Vo2 output from the secondary amplifier V2 and comparing the received secondary voltage signal Vo2 with the reference voltage signal Vref to output a tertiary voltage signal Vo3; And a compensation circuit for receiving and compensating the third voltage signal Vo3 from the comparator V5 and applying a compensation voltage signal to the addition integrator V1.