Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takao Moriwaki0
Kazuya Yamamoto0
Takayuki Matsuzuka0
Date of Patent
January 15, 2013
0Patent Application Number
131950510
Date Filed
August 1, 2011
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A power amplifier includes an input matching circuit, an amplifier transistor for amplifying an input signal received through the input matching circuit, an element for varying the collector voltage of the amplifier transistor, a bias circuit for varying the idle current in the amplifier transistor, and a compensation circuit for varying capacitance of the input matching circuit to maintain the phase shift and the input reflection in the power amplifier constant when the collector voltage and the idle current are varied, to prevent a decrease in the efficiency of the power amplifier due to changes in the output power of the amplifier transistor.
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