Patent ID: 6934341

Claim:
An apparatus for plurality signal generation, comprising: a digital baseband generator that generates a digital baseband input signal, a controller that receives and processes the digital baseband signal to generate at least one time delayed, gain adjusted driving signal; a reference RF up-converter that converts a first one of the driving signals to a desired RF reference signal; a predistortion RF up-converter that combines a second one of the driving signals with a predistortion signal and converts the combined pre-distorted signal to a RF predistortion signal; an amplifier that amplifies the RF predistortion signal; a comparator that compares a sample of the RF predistortion signal with the RF reference signal and outputs an error signal corresponding to the comparison; a wide-band feed forward loop that amplifies the error signal and combines, in anti-phase, the amplified error signal with the amplified RF predistortion signal to produce an output signal; a measurement RF down-converter that samples and measures the error signal to provide a corresponding digital sampled error signal to the controller; and an adaptive estimator processor operatively coupled to the controller to estimate the performance of the apparatus by comparing the measured error signal with a delayed copy of the input signal and provide estimate information to the controller to support adaptive updating of the controller.