Charge amplifier circuit composed of the OPA128

Published:2011/6/28 3:30:00 Author:Rebekka | Keyword: Charge amplifier | From:SeekIC

The so-called charge amplifier is amplifier circuit used to amplify the signal from the piezoelectric devices charge. The intrinsic impedance of the amplifier circuit sources is high, while the signal is very weak. The formation of the current source is only pA level. The charge amplifier need to have high input resistance and low offset current. Or when the amplifier's bias current is similar to the signal current signals, the signals might be engulfed by the current. The normal amplification will not be achieved.



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