Multiple-stage operational amplifier and methods and systems...

Details Multiple-stage operational amplifier and methods and systems... Multiple-stage operational amplifier and methods and systems...

2007-04-10

2007-04-10

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S310000, C330S302000, C330S294000

Reexamination Certificate

active

11011443

ABSTRACT:
A multiple-stage operational amplifier including a gain stage for amplifying an input signal and implementing a dominant pole producing a frequency response having a gain roll-off with frequency and a unity gain frequency. An intermediate stage is coupled to an output of the gain stage and has a high input impedance and a low output impedance. A high gain amplifier configured as a low gain output stage using resistive feedback and coupled to an output of the intermediate stage drives an output of the operational amplifier and implements a dominant pole at a frequency substantially higher than the unity gain frequency implemented by the dominant pole implemented the gain stage.

REFERENCES:
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patent: 4559502 (1985-12-01), Hiujsing
patent: 4908566 (1990-03-01), Tesch
patent: 5115202 (1992-05-01), Brown
patent: 5880634 (1999-03-01), Babanezhad
patent: 6140879 (2000-10-01), Morrish
patent: 6201835 (2001-03-01), Wang
patent: 6307430 (2001-10-01), Thomsen
patent: 6778017 (2004-08-01), Analui et al.

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