Inhibit circuit for a differential amplifier

Details Inhibit circuit for a differential amplifier Inhibit circuit for a differential amplifier

1979-05-23

1981-03-17

Mullins, James B.

Amplifiers

Combined with automatic amplifier disabling switch means

330258, 330259, H03F 345

Patent

active

042570093

ABSTRACT:
The outputs of a pair of non-additive combiners are coupled to respective inputs of a differential amplifier and an a.c. signal to be amplified is applied to a selected input of one of the combiners. A control circuit operates in a first mode to apply control voltages to the combiner inputs for causing the one combiner to block the a.c. signal and also causing both combiners to apply a common mode input voltage of a first value to the amplifier inputs. In a second mode, the control circuit changes the values of the control voltages in a sense to cause the one combiner to pass the a.c. signal and to also cause both combiners to apply a common mode input voltage of a second value to the amplifier inputs whereby, in either mode, the amplifier produces a constant quiescent d.c. output voltage.

REFERENCES:
patent: 3072853 (1963-01-01), Buffington et al.
patent: 3371160 (1968-02-01), Hurford
patent: 3430154 (1969-02-01), Harwood
patent: 3651418 (1972-03-01), Wittman
patent: 3707603 (1972-12-01), Limberg

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