Patent ID: 8010065

Claim:
A control device of a power amplifier (PA), comprising: a mode selection module, for receiving an input signal and outputting a mode signal according to a comparison result between an envelope amplitude of the input signal and a threshold value; a parameter providing module, for providing a supply voltage parameter and a PA input power parameter; a waveform adjusting module, coupled to the mode selection module and the parameter providing module to receive the input signal and outputting a PA input signal to an input terminal of the PA, wherein when the mode signal is in a first mode, the waveform adjusting module obtains the PA input power parameter from the parameter providing module according to the envelope amplitude of the input signal and outputs the PA input signal according to the PA input power parameter and the input signal; a power voltage generation module, coupled to the mode selection module and the parameter providing module for outputting a supply voltage to a power terminal of the PA, and obtaining the supply voltage parameter from the parameter providing module according to the envelope amplitude of the input signal when the mode signal is in the first mode, so as to set the supply voltage; and a bias generation module, coupled to the mode selection module for outputting an amplifier bias to a bias terminal of the PA, and setting the amplifier bias to be a first predetermined bias according to the mode signal when the mode signal is in the first mode.