Dual differential-input amplifier having wide input range

Details Dual differential-input amplifier having wide input range Dual differential-input amplifier having wide input range

2005-01-18

2005-01-18

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S253000, C330S257000

Reexamination Certificate

active

06844781

ABSTRACT:
A dual differential-input operational amplifier that includes six PMOSFETs having their source terminals coupled to a high voltage. A seventh and eighth PMOSFET have their source terminals coupled to a current source. Four NMOSFETs have their source terminals coupled to a low voltage. A fifth and sixth NMOSFET have their source terminals coupled to a current sink. The various PMOSFETs and NMOSFETs are coupled together such that the gate terminals of the fifth NMOSFET and eighth PMOSFET receive a first input of the differential input, and such that the gate terminals of the sixth NMOSFET and the seventh PMOSFET receive a second input of the differential input. The operational amplifier may be vertically inverted, or implemented by bipolar transistors, with cascoding devices, and with a second stage in the form of an inverter.

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ISBN 0-7803-3416-7 Baker, R. Jacob CMOS circuit design, layout, and simulation/ R. Jacob Baker, Harry W. Li, and David E. Boyce (IEEE Press series on microelectronic systems) 1997, p. 643.
CMOS Analog Circuit Design; Phillip E. Allen & Douglas R. Holberg 1987 Copyright Holt, Rinehart and Winston p 356 & 410.

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