Differential operational amplifier with common mode feedback

Details Differential operational amplifier with common mode feedback Differential operational amplifier with common mode feedback

1989-03-15

1990-03-06

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330277, 330 9, H03F 316

Patent

active

049069438

ABSTRACT:
A circuit configuration includes a differential operational amplifier having differential input terminals and differential output terminals. A common mode feedback circuit sets a direct voltage operating point of the output terminals. A reference voltage terminal connected to the output terminals supplies a reference voltage. Two pairs of operating point transistors of complementary conductivity types have control terminals and have output circuits connected in series at a respective connection point for each pair. Each of the connection points is connected to a respective one of the output terminals. A reference current source controls the operating point transistors in parallel. First coupling capacitors are each connected between a respective one of the output terminals and a respective one of the control terminals of an associated operating point transistor of one conductivity type. The common mode feedback circuit includes second coupling capacitors and a remainder of the common mode feedback circuit. The second coupling capacitors are each connected between a respective one of the output terminals and a respective one of the control terminals of an associated operating point transistor of a conductivity type complementary to the one conductivity type, for decoupling the first coupling capacitors and the associated operating point transistors from the remainder of the common mode feedback circuit.

REFERENCES:
patent: 3530395 (1970-09-01), Prusha
patent: 4697152 (1987-09-01), Westwick

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