Electrically variable impedance circuit

Details Electrically variable impedance circuit Electrically variable impedance circuit

1979-03-08

1981-09-08

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307296A, 307493, 330257, 330284, H03H 1100

Patent

active

042887070

ABSTRACT:
An electrically variable impedance circuit in which a voltage-current converter circuit is provided to produce a current having a magnitude corresponding to an instantaneous input signal potential applied to an input terminal and a current variation of the voltage-current converter circuit is fed back to the input terminal, the current variation being controlled by a control signal to vary the circuit impedance seen from the input terminal. In order to expand the range of linearity in impedance, the voltage-current converter is so arranged that the varying component of its output current is linearly proportional to the instantaneous input signal potential, and a current converter circuit is provided which linearly converts the output current of the voltage-current converter circuit and whose output is coupled to the input terminal. The current converter circuit is comprised of a PN junction which develops a voltage which is the logarithm of the output current of the voltage-current converter and a transistor between the base and emitter of which is applied the voltage developed by the PN junction to produce a current which is the exponential of the voltage developed by the PN junction.

REFERENCES:
patent: 3676789 (1972-07-01), Bray
patent: 3761741 (1973-09-01), Hoeft
patent: 4066914 (1978-01-01), Gundry

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