利用DSP进行前馈功放设计

A DSP Controlled Adaptive Feedforward Amplifier LinearizerA DSP Controlled Adaptive Feedforward Amplifier Linearizer
Stephen J. Grant James K. Cavers School of Engineering Science, Simon Fraser University Paul A. Goud Dept. of Electrical Engineering, University of Alberta

Abstract―Currently, the only available wideband (multiple MHz) amplifier linearization method is feedforward. Feedforward, though, requires automatic adaptation of key parameters for reliable distortion cancellation as operating conditions vary. With a novel and appropriate use of DSP, we have implemented a feedforward linearizer with adaptation driven by easily computed gradient signals. This overcomes the difficulties, such as DC offsets at the output of analog mixers and masking of weak signals by stronger ones, that slow and/or cause incorrect convergence of many previously