| 摘要 |
<p>The present invention relates to the field of power amplifiers. In order to solve a problem in the prior art that when output power of a main power amplifier is saturated, back-off efficiency is not high since a peak power amplifier is turned on in advance, a power amplifier is provided, which includes a power dividing unit, a first power amplification tributary, a second power amplification tributary, and an impedance conversion unit. An input end of the first power amplification tributary and an input end of the second power amplification tributary are coupled to two output ends of the power dividing unit respectively. An output end of the first power amplification tributary is coupled to an output end of the second power amplification tributary through the impedance conversion unit. Rated power of a peak power amplifier in the second power amplification tributary is greater than that of a main power amplifier in the first power amplification tributary. The beneficial effects of the present invention lie in that larger back-off exists at the peak of an efficiency curve of the power amplifier, and in the case that power is back-off, efficiency of the power amplifier is improved.</p> |
