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...

2011-08-02

2011-08-02

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S260000

Reexamination Certificate

active

07990217

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: 6906588 (2005-06-01), Mouret et al.
patent: 2009/0302948 (2009-12-01), Weigandt et al.
patent: 2010/0007419 (2010-01-01), Gilbert

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