| 摘要 |
PROBLEM TO BE SOLVED: To simplify a circuit by eliminating the need of loading a special signal source and to provide high efficiency and low distortion by enhancing timing adjustment accuracy. SOLUTION: A power amplifier is provided with a power detecting device 7 for detecting the power of an RF signal amplified by an RF power amplifying transistor 2, and a phase control device 8 for detecting a deviation in inputting timing between a RF signal for the RF power amplifying transistor 2 and a drain voltage signal corresponding to a control signal AF from the power of the RF signal detected by the power detecting device 7, adjusts the phase of the control signal AF in accordance with a detection result of the deviation in the inputting timing and eliminates the deviation in the inputting timing. COPYRIGHT: (C)2009,JPO&INPIT
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