Composite differential amplifier

Details Composite differential amplifier Composite differential amplifier

1992-05-29

1993-10-19

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330259, H03F 345

Patent

active

052549569

ABSTRACT:
There is provided a composite differential amplifier with a lower voltage and a lower power consumption of the circuit thereof. An output of a differential amplifier is inputted into an emitter-follower and is delivered as a DC voltage from an emitter of each of transistors of the emitter-follower to a non-inverting input terminal or an operational amplifier. Then, an output of the operational amplifier is supplied to a variable current source. The variable current source at its current drain side is connected to a resistance side of the differential amplifier so that an external control voltage inputted to the non-inverting input side of the operational amplifier is equal to the DC output voltage of the differential amplifier.

REFERENCES:
patent: 3786362 (1974-01-01), Marsh et al.
patent: 4105942 (1978-08-01), Henry
patent: 4701719 (1987-10-01), Nagata
De la Plaza et al. "Power-Supply Rejection in Differential Switched-Capacitor Filters", IEEE Journal of Solid-State Circuits, vol. SC-19, No. 6, Dec. 1984, pp. 912-918.

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