Wide range operational amplifier

Details Wide range operational amplifier Wide range operational amplifier

1994-07-08

1995-06-13

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330257, H03F 345

Patent

active

054246814

ABSTRACT:
An operational amplifier includes a transistor differential pair having a common source terminal which is coupled to a first power supply terminal through a first current source circuit. A first transistor is provided which has a gate coupled to a first input terminal of the transistor differential pair, a source coupled to a first output of the transistor differential pair, and a drain coupled to a first output terminal. A second current source circuit is coupled between the first power supply terminal and the drain of the first transistor. A second transistor has a gate coupled to a second input terminal of the transistor differential pair, a source coupled to a second output of the transistor differential pair, and a drain coupled to a second output terminal. A third current source circuit is coupled between the first power supply terminal and the drain of the second transistor. A fourth current source circuit is coupled between the source of the first transistor and the second power supply terminal. A fifth current source circuit is coupled between the source of the second transistor and the second power supply terminal. The input signals of the transistor pair are applied to the gates of the source-input transistors connected to the transistor differential pair.

REFERENCES:
patent: 5146179 (1992-09-01), Carley et al.
patent: 5168243 (1992-12-01), Feliz et al.
Ribner, David "Design Techniques for Cascoded CMOS Op Amps with Improved PSRR and Common-Mode Input Range" IEEE Journal of Solid State Circuits, vol. SC-19, No. 6, Dec. 1984.

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