Operational amplifier operable with high performance even at a l

Details Operational amplifier operable with high performance even at a l Operational amplifier operable with high performance even at a l

1997-02-14

1999-08-03

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, H03F 345

Patent

active

059330554

ABSTRACT:
An operational amplifier attaining a class-AB operation with a low voltage power supply. The operational amplifier has an output buffer circuit including transistors of opposite polarity serially connected with an output there between. A first differential current amplifier and a first current mirror circuit drive one of the transistors. A level shifter that includes a second differential current amplifier, a second current mirror circuit and a current aliasing circuit drives the other transistor. The current aliasing circuit is operated at a very low voltage. With this configuration, the currents that flow through the transistors have different values, resulting in a differential current being output from the output between the transistors.

REFERENCES:
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patent: 5361040 (1994-11-01), Barrett, Jr.
patent: 5477190 (1995-12-01), Brehmer et al.
1995 IEEE International Symposium On Circuits and Systems (ISCAS), Seattle, Apr. 30-May 3, 1995, vol. 2, Institute of Electrical and Electronics Engineers, "A CMOS Rail-to-Rail Linear VI-Converter", Vervoort et al., pp. 825-828, XP000558810, Apr. 30, 1995.

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