Differential amplifier

Details Differential amplifier Differential amplifier

1975-02-12

1976-05-25

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

330 35, H03F 345

Patent

active

039597334

ABSTRACT:
An operational amplifier includes an input differential stage formed of a differential pair of transistors, a tail current source supplying that differential pair, and a pair of current source loads, each connected to a respective one of the transistors of the differential pair. A common mode feedback loop is provided from a second stage of the differential amplifier to remove any excess current supplied by the tail current source which is not drawn by the current source loads. A single capacitor is employed for assymetric frequency compensation of the second stage, such that the above described common mode feedback can be applied without producing oscillations.

REFERENCES:
patent: 3395358 (1968-07-01), Petersen
patent: 3440554 (1969-04-01), McGraw et al.
patent: 3444476 (1969-05-01), Leidich
patent: 3786362 (1974-01-01), Marsh et al.
patent: 3810031 (1974-05-01), Poujois
russell, et al., "A High-Voltage Monolithic Operational Amplifier," IEEE Journal of Solid State Circuits, Vol., SC-6, No. 6 Dec. 1971, pp. 352-357.
Woodward et al., "An Inexpensive Current-Voltage Booster for Electrochemical Instrumentation," Analytical Chemistry, Vol. 45, No. 2, Feb. 1973, pp. 435-436.

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