Variable resistance circuit

Details Variable resistance circuit Variable resistance circuit

1984-03-30

1985-09-10

Mullins, James B.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

330288, 323317, H03K 500

Patent

active

045408963

ABSTRACT:
A variable resistance circuit includes an emitter-follower transistor having a base coupled to an input terminal, a collector and an emitter; a resistance element inserted between the emitter of the emitter-follower transistor and an output terminal; a current mirror circuit whose current input circuit is coupled to the collector of the emitter-follower transistor and whose current output circuit is coupled to the output terminal; and a control circuit coupled to the current mirror circuit. The current mirror operation of the current mirror circuit is controlled by a control signal so that an effective impedance measured from the output terminal is changed according to the control signal. In above the circuit the effective impedance at the output terminal may have plural values according to the control signal.

REFERENCES:
patent: 3761741 (1973-09-01), Hoeft
patent: 4339677 (1982-07-01), Hoeft
Japanese Patent Disclosure (Kokai), No. S55-64419.

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