Patent ID: 7346122
Filing Date: 2008-03-18
Classification: H03F,H04L

Abstract:
1. A transmitter operating in a switching-mode, the transmitter comprising: a signal decomposition unit decomposing a modulated digital signal into a first signal and a second signal, both being expressed in polar coordinates; an adaptive predistorter, coupled to the signal decomposition unit, configured to distort the first and second signals respectively in accordance with one or more of distorting parameters; a phase equalizer, coupled to the adaptive predistorter, configured to equalize a time delay between the distorted first and second signals in response to a first control signal provided by a feedback loop operating on a sample of an amplified RF signal to generate equalized first and second signals; a phase lock loop (PLL) responsive to the equalized second signal, a second control signal from the feedback loop, a reference frequency signal and a carrier frequency signal for producing a radio frequency (RF) signal, wherein a power amplifier is coupled to the PLL for receiving the RF signal and to produce said amplified RF signal responsive to the equalized first signal; and means for receiving and transmitting said amplified RF signal.