Operational amplifier with high common mode rejection

Details Operational amplifier with high common mode rejection Operational amplifier with high common mode rejection

1995-05-05

1997-01-28

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, 330258, H03F 345

Patent

active

055981283

ABSTRACT:
An operational amplifier includes a symmetrical end stage being formed of emitter followers. The end stage has output terminals forming outputs of the operational amplifier and has input terminals. A voltage divider is connected between the output terminals of the end stage and has a tap. A first differential amplifier stage has input terminals forming symmetrical inputs of the operational amplifier and has output terminals each being coupled to a respective one of the input terminals of the end stage. Loads each terminate a respective one of the output terminals of the first differential amplifier stage. Two second parallel-connected differential amplifier stages each have a first input terminal connected to a reference potential, a second input terminal connected to the tap of the voltage divider, and an output terminal each being coupled to a respective one of the loads.

REFERENCES:
patent: 3582802 (1971-01-01), Weekes et al.
patent: 5254956 (1993-10-01), Nishijima
patent: 5298809 (1994-03-01), Yamaguchi

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