METHOD AND APPARATUS FOR POWER AMPLIFIER LINEARIZATION OF POLAR TRANSMITTERS CAPABLE OF COMPENSATING DELAY TIME DIFFERENCE BETWEEN A TRANSMITTING PATH AND A FEEDBACK PATH

摘要

PURPOSE: A method and apparatus for power amplifier linearization of polar transmitters are provided to linearize a power amplifier through a digital distortion device and to compensate time delay difference between a transmitting path and a feedback path. ;CONSTITUTION: First and second demodulators demodulate the output signal of a power amplifier. First and second ADC(Analog to Digital Converters) convert demodulated signals into digital complex baseband signals(710). A delay estimator estimates the delay time of a scale modulation signal and a phase modulation signal(720). A delay compensator compensates time delay of a size information signal and a phase information signal(730). A digital pre-distorter compensates the AM-AM distortion and the AM-PM distortion of the power amplifier(750).;COPYRIGHT KIPO 2011