Variable electronic impedance circuit

Details Variable electronic impedance circuit Variable electronic impedance circuit

1982-06-02

1984-11-27

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

307264, 330110, 330284, H03F 134

Patent

active

044853505

ABSTRACT:
A variable electronic impedance circuit is constructed of a voltage-current converter whose input terminal is supplied with an input signal voltage, and a variable-gain current amplifier whose input terminal is supplied with an output current of the voltage-current converter and whose output signal current is fed back to the input terminal of the voltage-current converter.
In order to prevent the undesirable oscillation phenomenon of the variable electronic impedance circuit immediately after the closure of a power supply, a control circuit which operates for a predetermined time after the closure of the power supply is especially arranged.
Since an output signal from the control circuit inhibits the operation of the variable-gain current amplifier during the predetermined time, the unstable operation immediately after the closure of the power supply can be prevented.

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