Improved charge amplifier using hybrid hysteresis compensation

Rev Sci Instrum. 2013 Aug;84(8):085115. doi: 10.1063/1.4818140.

Abstract

We present a novel charge amplifier, with a robust feedback circuit and a method for compensating piezoelectric actuator's hysteresis at low frequencies. The amplifier uses a modified feedback circuit which improves robustness to the addition of series load impedance such as in cabling. We also describe a hybrid hysteresis compensation method for enabling the charge amplifier to reduce hysteresis at low frequencies. Experimental results demonstrate the utility of the new amplifier design.