JFET AC Coupled Integrator

This is JFET AC Coupled Integrator circuit. This circuit is used to achieve very high voltage gain. To achieve very high voltage gain this circuit uses “µ-amp” technique. Here is the circuit :

JFET AC Coupled Integrator

C1 is used as  a capacitance multiplier or Miller integrator. It will allow the circuit to handle very long time constants. [Source: National Semiconductor Application Note]