Impedance matched variable gain low noise amplifier using...

Details Impedance matched variable gain low noise amplifier using... Impedance matched variable gain low noise amplifier using...

2007-11-27

2007-11-27

Nguyen, Patricia (Department: 2817)

Amplifiers

Signal feedback

Amplifier in signal feedback path

C330S254000, C330S260000

Reexamination Certificate

active

11295431

ABSTRACT:
The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eliminating the feedback mechanism. This ensures that the input impedance seen at the input port does not grow excessively, using part of the feedback resistor as a passive termination at low gain levels. In this way variable gain ranges in excess of 30 dB can be achieved.

REFERENCES:
patent: 3662276 (1972-05-01), Hyer
patent: 3737798 (1973-06-01), Faraguet et al.
patent: 5327027 (1994-07-01), Taylor
patent: 6538507 (2003-03-01), Prentice et al.
patent: 7064605 (2006-06-01), Westwick et al.

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