Electrically variable impedance circuits

Details Electrically variable impedance circuits Electrically variable impedance circuits

1976-10-27

1978-01-03

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307296R, 323 79, 323 81, H03K 508

Patent

active

040669149

ABSTRACT:
In a known variable impedance circuit with the variable impedance established across junctions of transistors connected in two branches between a control current source, for variably forward-biasing the junctions, and an equalizing circuit for equalizing the currents in the branches, the balance of the circuit is upset when an amplifier connected to one branch draws input bias current therefrom. This problem is overcome by a transistor connected to the other branch to draw a matching current from the second branch. Transistors may be connected to both branches to increase the currents in the equalizing circuit and thereby improve the operation thereof when the control current is reduced to a low value for obtaining a high impedance.

REFERENCES:
patent: 3719833 (1973-03-01), Free
patent: 3986058 (1976-10-01), Hongu et al.

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