Patent ID: 7962108
Filing Date: 2011-06-14
Classification: H03F,H04B

Abstract:
1. A method for calibrating Amplitude Modulation to Phase Modulation (AM/PM) compensation in a transmitter operating according to a polar modulation scheme comprising: obtaining during ramp-up for a transmit burst phase error measurements of a phase error between a phase of an input signal provided to an input of power amplifier circuitry of the transmitter and a phase of an output signal provided at an output of the power amplifier circuitry; pre-distorting the input signal to provide AM/PM compensation during ramp-up for the transmit burst using seed compensation circuitry calibrated for ideal load conditions; and providing AM/PM compensation for the transmit burst based on the phase error measurements by calibrating adaptive compensation circuitry based on the phase error measurements and pre-distorting the input signal to provide AM/PM compensation for at least a portion of the transmit burst after ramp-up using the adaptive compensation circuitry.