Differential amplifier with common-mode bias feedback

Details Differential amplifier with common-mode bias feedback Differential amplifier with common-mode bias feedback

1988-04-22

1990-02-27

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330253, H03F 345, H03F 316

Patent

active

049049534

ABSTRACT:
A differential amplifier includes a pair of input transistors for directing portions of a load current from a current source through a pair of load transistors in response to a differential input signal. A common mode output voltage of the differential amplifier is detected and applied to control terminals of a pair of feedback transistors. The feedback transistors couple the load transistors to a reference voltage and act therewith to provide control currents through the load transistors concurrent with the load currents. The control currents provide feedback that maintains the common mode output voltage at a constant threshold level.

REFERENCES:
patent: 4543538 (1985-09-01), Fay
patent: 4616189 (1986-10-01), Pengue, Jr.
IEEE Journal of Solid State circuits, vol. SC-19, No. 1, Feb. 1984, p. 10.
IEEE Journal of Solid State Circuits, vol. SC-18, No. 3, Jun. 1983, p. 359.
IEEE Technical Digest, 1984 GaAs IC Symposium, p. 11.

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