Variable feedback circuits and methods

Details Variable feedback circuits and methods Variable feedback circuits and methods

2007-08-14

2007-08-14

Nguyen, Patricia (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S254000, C330S282000

Reexamination Certificate

active

11166508

ABSTRACT:
In one embodiment, the present invention includes a circuit comprising an amplifier having an input terminal, an output terminal, a positive supply voltage, and a negative supply voltage. The amplifier is configured to have a first gain. A variable feedback circuit is coupled between the input terminal and the output terminal. The difference between the voltage on the output terminal and input terminal is received by the variable feedback circuit, which changes the gain of the circuit and reduces distortion.

REFERENCES:
patent: 4350959 (1982-09-01), Rosenbaum
patent: 5793254 (1998-08-01), O'Connor
patent: 5877612 (1999-03-01), Straw
patent: 6392478 (2002-05-01), Mulder et al.
patent: 6882226 (2005-04-01), Cho et al.
patent: 2003/0123168 (2003-07-01), Yokomizo

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