Automatic current reduction biasing technique for RF amplifier

Details Automatic current reduction biasing technique for RF amplifier Automatic current reduction biasing technique for RF amplifier

2006-02-14

2006-02-14

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including gain control means

C330S296000

Reexamination Certificate

active

06998918

ABSTRACT:
A power amplifier (PA) circuit is disclosed that comprises a PA output stage having a first amplifying portion having a first gain portion and disposed in parallel with a second amplifying portion having a second gain portion, the PA output stage having an output stage gain, an input port for receiving of a RF input signal. A second RF power detector is provided for detecting a signal power of the RF input signal and for providing a second detected signal. An at least a biasing circuit is provided for biasing the first amplifying portion and the second amplifying portion in dependence upon the second detected signal for amplifying the RF input signal such that for the output stage gain the ratio between the first gain portion and the second gain portion varies in dependence upon the second detected signal.

REFERENCES:
patent: 3925718 (1975-12-01), Wittlinger
patent: 5825228 (1998-10-01), Gross
patent: 6396347 (2002-05-01), Lie et al.
patent: 6472857 (2002-10-01), Genest et al.
patent: 6946913 (2005-09-01), Moriwaki et al.
patent: 2002/0113655 (2002-08-01), Lautzenhise et al.
patent: WO 2004/027984 (2004-04-01), None
patent: WO 2004/055972 (2004-07-01), None
patent: WO 2004/055973 (2004-07-01), None

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