Gain control circuit

Details Gain control circuit Gain control circuit

1975-02-11

1976-02-24

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 25, 330 30D, H03G 330

Patent

active

039407080

ABSTRACT:
A gain control circuit of the balanced type whose gain is linearly controllable over a wide range and wherein the DC level at the circuit output is maintained at a constant value regardless of variations of the controlling current. The gain control circuit is comprised of a first differential amplifier which receives an input signal differentially applied thereto, and a second differential amplifier connected in series with the first differential amplifier. Unidirectional conductors are connected to the outputs of the first differential amplifier as a load impedance and variable currents are supplied to the first differential amplifier outputs to control the currents flowing in the unidirectional conductors and thereby vary the load impedances presented by the unidirectional conductors. The amplified output signal is derived from an output of the second differential amplifier.

REFERENCES:
patent: 3803505 (1974-04-01), Ishigaki et al.

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