Charge amplifier circuit diagram OPA128

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The so-called charge amplifier means for amplifying the signal charge from the piezoelectric device amplifying circuit . Such high internal impedance

of the amplifier signal source, while its charge very weak signal, the current source is formed only pA level, which requires a charge amplifier with a high input resistance and low bias current, otherwise when the amplifier bias current and signal current is similar to the bias current signal may be overwhelmed, and can not achieve normal zoom. Further, high-impedance (1012 ) in the usual sense amplifier circuit can not be used. Often used for this type of electrostatic integrated operational amplifier OPA128 amplifier circuit composed. As shown for the charge amplifier OPA128 constituted.

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