Variable impedance circuit

Details Variable impedance circuit Variable impedance circuit

1976-04-01

1977-08-02

Gensler, Paul L.

Tuners

Tuner unit directly responsive to voltage and/or current...

Reactance tuning

307229, 307264, 325464, 333 80T, H03J 320, H03H 512, H03H 1100

Patent

active

040399818

ABSTRACT:
A variable impedance circuit comprises an amplifier with a high input impedance and a high output impedance whose gain is variable in response to a control voltage, an emitter-follower transistor, and an impedance element adapted to feedback an output signal to an input terminal of the amplifier. The input terminal of the amplifier and the input terminal of the emitter-follower transistor are connected in common. The emitter-follower transistor has its output terminal connected in series with the output terminal of the amplifier through a load resistor. An impedance of the amplifier as viewed from its input terminal is multiplied by Miller effect and varied in value by the control signal to a great extent.

REFERENCES:
patent: 3539826 (1970-11-01), Crouse

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