Variable gain amplifier circuit, method of correcting DC...

Details Variable gain amplifier circuit, method of correcting DC... Variable gain amplifier circuit, method of correcting DC...

2008-09-02

2008-09-02

Nguyen, Patricia (Department: 2817)

Amplifiers

With periodic switching input-output

C330S254000, C330S253000

Reexamination Certificate

active

11448828

ABSTRACT:
A variable gain amplifier circuit according to an embodiment of the invention includes: an output offset correcting unit for executing correction to attenuate a fixed offset component independent of a gain change of a variable gain amplifier circuit out of a DC offset involved in an output voltage of an amplifying unit; and an input offset correcting unit for executing correction to attenuate an input offset component that varies depending on a gain of an amplifying unit. The correction of the fixed offset component with the output offset correcting unit and the correction of the input offset component with the input offset correcting unit are independently executed.

REFERENCES:
patent: 6441684 (2002-08-01), Nakamura
patent: 6741131 (2004-05-01), Nicklasson
patent: 7061325 (2006-06-01), Pitz
patent: 7148744 (2006-12-01), Bailey et al.
patent: 7239199 (2007-07-01), Chien et al.
patent: 2005/0200421 (2005-09-01), Bae et al.
patent: 9-64666 (1997-03-01), None

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