| 摘要 |
The present invention relates to arrangements and procedures in the power amplification of a signal. The power of an input signal is amplified and the power-amplified input signal forms an output signal whose power shall be in agreement with a reference level. The power of the signal is amplified with a power amplification circuit (5) that includes a power amplifier (1) and a control unit (2). The power amplification circuit (5) also includes means for measuring the power of the output signal. The control unit (2) generates supply voltages for the transistors (58, 64, 70) of the power amplifier (1) in relation to said reference level, so as to obtain a power amplifier (1) of good efficiency. The control unit (2) regulates the power of the output signal in relation to the reference level and in relation to the power of the output signal, so that the power of the output signal will be in general agreement with said reference level. The power amplifier (1) may also include controllable matching circuits that are controlled by controlled signals generated in relation to said reference level, so as to further improve the efficiency of the power amplifier (2). |
