Patent ID: 7706467

Claim:
A transmitter comprising: an input signal source having an input signal that includes both amplitude and phase information; an amplifier coupled to the input signal source and operable for receiving the input signal with amplitude and phase information and amplifying the input signal to produce an output signal; a power supply coupled to the amplifier for supplying power to the amplifier, the power supply operable for tracking the power level of an input signal envelope rather than the precise envelope waveform and varying the level of a power supply output signal supplied to the amplifier, according to a transfer function of the power supply, in response to variation of the power level of the input signal envelope rather than the precise envelope waveform; a digital predistortion circuit coupled to the power supply, the digital predistortion circuit operable for receiving a digital representation of the input signal envelope and digitally predistorting the input signal envelope tracked by the power supply to address non-linearities in the transfer function of the power supply and to produce a predistorted signal that does not precisely follow the input signal envelope thereby improving the input signal envelope-tracking capabilities of the power supply.