JFET AC Coupled Integrator
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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 : 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]
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