Differential amplifier

Details Differential amplifier Differential amplifier

1984-11-08

1985-11-26

LaRoche, Eugene

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

045556709

ABSTRACT:
A differential amplifier is disclosed which comprises: a first differential amplifying circuit comprising first and second transistors of an NPN type, the collector of the first transistor constituting an output terminal of the amplifier; a second differential amplifying circuit comprising third and fourth transistors of the NPN type whose bases are inverting and noninverting input terminals, respectively, the base of the third transistor being connected to the collector of the second transistor, and the base of the fourth transistor being supplied with a bias voltage; a first load circuit for the first differential amplifying circuit, the first load circuit comprising a fifth transistor of a PNP type forming a collector load for the second transistor and a sixth transistor of the PNP type for forming a collector load for the first transistor, the bases of the fifth and sixth transistors being connected to the collector of the fourth transistor; and a second load circuit for the second differential amplifying circuit.

REFERENCES:
patent: 3440554 (1969-04-01), McGraw et al.
patent: 3564439 (1971-02-01), Rao
patent: 4272728 (1981-06-01), Wittlinger

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