Method and apparatus for common mode control

Details Method and apparatus for common mode control Method and apparatus for common mode control

2006-08-08

2006-08-08

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S259000

Reexamination Certificate

active

07088181

ABSTRACT:
A common mode feedback circuit is provided that can set a direct voltage operating point of the outputs of an associated amplifier. A feedback path of common mode feedback circuit is configured to be independent from and not pass through the associated amplifier. The common mode feedback circuit can remain powered on during power down of the associated amplifier and maintain a large feedback loop capacitance (in the common mode feedback circuit) at an approximately normal operating voltage to advantageously reduce settling time of an associated amplifier that has been powered off.

REFERENCES:
patent: 5281924 (1994-01-01), Maloberti et al.
patent: 5847607 (1998-12-01), Lewicki et al.
patent: 6121843 (2000-09-01), Vampola et al.
patent: 6400220 (2002-06-01), Wang et al.
patent: 6411166 (2002-06-01), Bashirotto et al.
patent: 6617926 (2003-09-01), Casper et al.
patent: 6888407 (2005-05-01), Ramazan et al.

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