Low noise variable gain amplifier

Details Low noise variable gain amplifier Low noise variable gain amplifier

2005-12-30

2008-08-05

Pascal, Robert J. (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S278000

Reexamination Certificate

active

07408407

ABSTRACT:
The present invention provides systems and methods for asymmetrically varying gain in a low noise amplifier. The amplifier includes a first stage amplifier, a plurality of second stage amplifiers coupled to the first stage amplifier, a comparator coupled to one of the second stage amplifiers, and a controller coupled to the comparator, the first stage amplifier, and the plurality of second stage amplifiers. The controller is configured to produce one or more gain control signals to change the gain of one of the first stage amplifier or the plurality of second stage amplifiers at a plurality of asymmetric rates so as to cause the power of the output signal to move toward one of the threshold values of the comparator. The rate of change of the gain is based on conditions including the gain of the first stage amplifier, gain of a second stage amplifier, and the sampled power level.

REFERENCES:
patent: 6798286 (2004-09-01), Dauphinee et al.
patent: 7068100 (2006-06-01), Dauphinee et al.
patent: 7183845 (2007-02-01), Dauphinee et al.
patent: 7215933 (2007-05-01), Tse et al.

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