Input system for a variable gain amplifier having class-AB...

Details Input system for a variable gain amplifier having class-AB... Input system for a variable gain amplifier having class-AB...

2007-08-21

2009-02-24

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

07495511

ABSTRACT:
A variable gain amplifier includes an attenuator having a plurality of pairs of tap points, and a plurality of pairs of gm cells, wherein each pair of gm cells is coupled to a corresponding pair of the tap points, and each pair of gm cells is constructed and arranged to operate as a multi-tanh cell.

REFERENCES:
patent: 5077541 (1991-12-01), Gilbert
patent: 5489878 (1996-02-01), Gilbert
patent: 5684431 (1997-11-01), Gilbert et al.
patent: 6445248 (2002-09-01), Gilbert
patent: 6525601 (2003-02-01), Gilbert
patent: 6812771 (2004-11-01), Behel et al.
patent: 6906588 (2005-06-01), Mouret et al.
patent: 7196577 (2007-03-01), Brunner

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