| 摘要 |
Disclosed is a high efficiency power amplifier, which comprises inpput part receiving signal from a voltage amplifying stage; output part which output the inputted signal after power amplification; a plurality of power sources which selectively supplies the output part with a voltage according to the level of amplified signal. The level of amplified signal is detected by a detection part, and the signal detected by the detection part is compared to the threshold value, by a comparison part. A control part slectively connects on of the power source parts to the output part, according to the comparison result through the comparison part. |
