Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Reexamination Certificate
2007-09-11
2007-09-11
Nguyen, Patricia (Department: 2817)
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
C330S296000, C330S289000, C330S278000
Reexamination Certificate
active
11298525
ABSTRACT:
A Doherty microwave amplifier having a main amplifier and a peaking amplifier, distributing and inputting an input signal to the main amplifier and the peaking amplifier to obtain an output signal by combining an output from the main amplifier and an output from the peaking amplifier, comprises a first coupler which branches and outputs a part of the input signal, a second coupler which branches and outputs a part of the output signal, and a bias control unit which feedback-controls a bias signal to the peaking amplifier, based on a difference between a level of a signal branched and output from the first coupler and a level of a signal branched and output from the second coupler.
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Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kabushiki Kaisha Toshiba
Nguyen Patricia
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