High gain differential amplifier

Details High gain differential amplifier High gain differential amplifier

1978-06-20

1980-08-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

307299B, 330257, 330261, H03F 345

Patent

active

042164362

ABSTRACT:
The disclosed amplifier includes first and second transistors each having an emitter coupled to a bias source, a base, a first collector and a second collector. A third transistor has a collector connected to another bias source, an emitter connected to the base of the first transistor and to the first collector of the second transistor, and a base for receiving input signals. A fourth transistor has a collector connected to another bias source, an emitter connected to the base of the second transistor and to the first collector of the first transistor, and a base for receiving second input signals. Any difference in voltage between the input signals is indicated by an imbalance in current through the second collectors of the first and second transistors. The first collectors of these transistors provide positive feedback for amplifying the magnitude of this imbalance.

REFERENCES:
patent: 3673508 (1972-06-01), Callahan, Jr.
patent: 3783400 (1974-01-01), Gay
patent: 4147944 (1979-04-01), Monticelli

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