Hence all the stray capacitances (the cable capacitance, the amplifier input capacitance, etc.) are virtually grounded and they have no influence on the output signal. The input impedance of the circuit is almost zero because of the Miller effect. The greater the capacitor value, the less output voltage has to be generated to produce a particular feedback current flow. The output voltage is therefore dependent on the value of input current it has to offset and the inverse of the value of the feedback capacitor.
The input current is offset by a negative feedback current flowing in the capacitor, which is generated by an increase in output voltage of the amplifier. The integrator circuit is mostly used in analog computers, analog-to-digital converters and wave-shaping circuits.Ī common wave-shaping use is as a charge amplifier and they are usually constructed using an operational amplifier though they can use high gain discrete transistor configurations.
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