Variable gain amplifier circuits

Details Variable gain amplifier circuits Variable gain amplifier circuits

2008-03-27

2009-10-13

Nguyen, Khanh V (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S254000, C330S282000

Reexamination Certificate

active

07602239

ABSTRACT:
A variable gain amplifier circuit has an amplifier, a string of resistors, a plurality of gain switches, a current source, and at least two current switches. A first input terminal of the amplifier receives an input voltage signal. The string of resistors are coupled between an output terminal of the amplifier and a bias voltage input terminal. Each of the gain switches is coupled between a second input terminal of the amplifier and one of connection nodes between two of the resistors. Each of the current switches is coupled between the current source and one of the connection nodes. The current source provides a current through the turned-on current switch.

REFERENCES:
patent: 7057454 (2006-06-01), Ma et al.
patent: 7545209 (2009-06-01), Hughes

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