| 摘要 |
The invention relates to power amplifiers having an adjustable output impedance. A power amplifier according to the invention can be used, for example, for feeding a radio frequency transmission signal into an antenna of a mobile communication device. The real part of an output impedance of a power amplifier according to the invention is matched with the real part of an impedance loading the power amplifier by adjusting an operating point of an output stage transistor 301 of the power amplifier.
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