Preserving linearity of an isolator-free power amplifier by...

Details Preserving linearity of an isolator-free power amplifier by... Preserving linearity of an isolator-free power amplifier by...

2003-12-10

2008-08-05

Pascal, Robert (Department: 2817)

Amplifiers

Combined with automatic amplifier disabling switch means

C330S295000

Reexamination Certificate

active

07408404

ABSTRACT:
An amplifier circuit (100) includes a driver stage (120) with active devices (140) for pre-amplification and output of a pre-amplified signal; and an output stage (160) with active devices (180) for further amplification of the pre-amplified signal and output of an amplified signal. A detector (190) measures levels of forward and reflected parts of the amplified signal, and a control circuit (145) independently and selectively controls turning on and off of the active devices (140, 180) of the driver and output stages (120, 160) as a function of the levels of the forward and reflected signals to substantially maintain linearity of the amplifier circuit (100) with load variations.

REFERENCES:
patent: 5423082 (1995-06-01), Cygan
patent: 5442322 (1995-08-01), Kornfeld
patent: 5712593 (1998-01-01), Buer
patent: 6064266 (2000-05-01), Anderson
patent: 6362690 (2002-03-01), Tichauer
patent: 6556815 (2003-04-01), Shibamura
patent: 6791407 (2004-09-01), Grebennikov et al.
patent: 7157966 (2007-01-01), Baree et al.

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