Doherty amplifier

Details Doherty amplifier Doherty amplifier

2005-02-08

2005-02-08

Choe, Henry (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S295000

Reexamination Certificate

active

06853245

ABSTRACT:
A microwave Doherty amplifier employs a way-extension in which N ways (N≧2, N is a natural number) are established, and envelope tracking for high efficiency and linearity of the power amplifier of a mobile communications base station or of a handset with improved reliability. The Doherty amplifier includes N ways, where N≧2 and N is a natural number; a carrier amplifier which is placed on one of the N ways; peak amplifiers which are placed on respective ways of the (N−1) ways excluding the way on which the carrier amplifier is placed; a power distribution unit which distributes power to each of the N ways; and a quarter wave impedance transformer at which the N ways meet.

REFERENCES:
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patent: 5757229 (1998-05-01), Mitzlaff
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patent: 6262629 (2001-07-01), Stengel et al.
patent: 6356149 (2002-03-01), Stengel et al.
patent: 6472934 (2002-10-01), Pehlke
patent: 6639464 (2003-10-01), Hellberg
patent: 0 630 104 (1994-12-01), None

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