Patent ID: 6700440
Filing Date: 2004-03-02
Classification: H03F,H03G,H04B

Abstract:
A high-frequency power amplifier having a plurality of switching-driven transistors, said amplifier comprising:a plurality of switching-driven transistors connected in parallel with each other; means for applying a fixed drain voltage to a first portion of said plurality of transistors; means for applying a variable drain voltage to a second portion of said plurality of transistors according to a control value; means for turning on or off an operation of the first portion of said plurality of transistors having a fixed drain voltage; and means for controlling an output of said amplifier by varying an output of said high-frequency power amplifier through controlling a drain voltage of said second portion of said plurality of transistors and by turning on the operation of the first portion of said plurality of transistors in a high output power region and, in a low output power region, turning off the operation of said plurality of transistors that have been turned on.