Patent ID: 6756852
Filing Date: 2004-06-29
Classification: H03F

Abstract:
A method for controlling a power amplifier, the power amplifier being used to amplify an input signal so as to generate an output signal, the input signal providing an input power PRF, and the output signal providing an output power POUT, which being capable of being represented as &Sum;i=0n&it;Ai&af;(PRF)i,where the variable n is an integer greater than 2, and each of the variables A0-An is defined as a power coefficient of the power amplifier, the power amplifier comprising:an input terminal for inputting the input signal; a first order circuit electrically connected to the input terminal and a first bias terminal; and a second order circuit electrically connected to a second bias terminal and an output terminal of the first order circuit; the method comprising: generating a first bias signal and applying the first bias signal to the first bias terminal to control operations of the first order circuit; generating a second bias signal and applying the second bias signal to the second bias terminal to control operations of the second order circuit; and making a waveform of the first bias signal being different from a waveform of the second bias signal to decrease a third order power coefficient A3 of the power coefficients A0-An.