Amplifier and device having amplifier, and mutual...

Details Amplifier and device having amplifier, and mutual... Amplifier and device having amplifier, and mutual...

2005-11-23

2008-03-04

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S051000, C330S295000

Reexamination Certificate

active

07339435

ABSTRACT:
An amplifier is provided with an amplifier circuit including a plurality of first transistors having gates thereof coupled in common, a bias circuit including a plurality of second transistors that are coupled and outputs a bias voltage to the gates of the plurality of first transistors, and a selection circuit simultaneously controlling a number of first transistors to be coupled to the amplifier circuit and a number of second transistors to be coupled to the bias circuit based on the bias voltage.

REFERENCES:
patent: 6987422 (2006-01-01), Vice
patent: 2000-091861 (2000-03-01), None
patent: 2003-188653 (2003-07-01), None

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