This circuit is an ultra high input impedance AC unity gain amplifier and used to get unity gain from ultra high input impedance AC. Here is the schematic :

Ultra-High input impedance AC unity gain amplifier circuit

Ultra-High input impedance AC unity gain amplifier circuit diagram

2N4416 IC is used to reduce the input capacitance. The IC has low capacitance. It’s operated as a source follower with bootstrapped gate bias resistor and the resistor.

Source : National Semiconductor Application Note

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