| 摘要 |
A power amplification circuit ( 10 ) includes a scalable power amplifier ( 20 ) to produce an RF output signal ( 50 ) at an output of the power amplification circuit ( 10 ), and a variable impedance circuit ( 30 ) coupled to the output of the power amplification circuit ( 10 ). The scalable power amplifier ( 20 ) includes a plurality of selectively activated amplifier elements ( 22 ), ( 24 ), ( 26 ) to produce the RF output signal ( 50 ) in accordance with a desired RF output signal power level. The power amplification circuit ( 10 ) selectively activates individual amplifier elements by, for example reducing power or increasing power to at least one amplifier element. The variable impedance circuit ( 30 ) varies an impedance of the variable impedance circuit ( 30 ) to dynamically load the output of the scalable power amplifier ( 20 ).
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