Patent ID: 7259630

Claim:
A predistorter configured for use with an RF power amplifier, the predistorter comprising: an input loop configured to be coupled to the input of an RF power amplifier, the input loop including a look-up table containing predistortion values, the input loop configured to apply the predistortion values to an input signal, in response to a monotonically increasing function of the input signal power, for forming a predistorted input signal; a peak control circuit coupled to the input loop, the peak control circuit configured to select a power supply voltage for the RF power amplifier in response to the power in the input signal; and an output loop coupled to the output of the RF power amplifier, the output loop tunable to frequency select a portion of a frequency band and measure an intermodulation distortion product of the RF power amplifier output resulting from the predistorted input signal and disposed in the selected portion of the frequency band, the output loop operable to update the predistortion values in the look-up table responsive to the measured intermodulation distortion product.