Differential-input amplifier circuit

Details Differential-input amplifier circuit Differential-input amplifier circuit

1979-08-28

1981-06-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330258, 330261, H03F 345

Patent

active

042727286

ABSTRACT:
A plural-stage amplifier circuit having improved common-mode input voltage range includes first and second transistors connected to form a first long-tailed pair, third and fourth transistors connected to form a second long-tailed pair in cascade connection after the first long-tailed pair, a first current supply providing tail current to the first long-tailed pair, a second current supply having a plurality of outputs providing collector currents to the first long-tailed pair, and a third current supply providing tail current to the second long-tailed pair. The output currents of the first, second and third current supplies are controlled in proportion to a control current which permits the voltage across the third current supply to be controlled such that the first and second transistors do not saturate at input voltages approaching the supply voltage.

REFERENCES:
patent: Re27351 (1972-05-01), McGraw et al.
patent: 3564439 (1971-02-01), Rao
patent: 3614645 (1971-10-01), Wheatley, Jr.
patent: 3876955 (1975-04-01), Ahmed
patent: 3946325 (1976-03-01), Leidich
patent: 3979689 (1976-09-01), Schade, Jr.
patent: 4007427 (1977-02-01), Leidich
patent: 4101842 (1978-07-01), Ohsawa

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