QUANTIZATION ANALYSIS AND DESIGN OF A DIGITAL PREDISTORTION LINEARIZER FOR RF POWER-AMPLIFIERS

Significant improvements in terms of reduced power consumption and inc reased bandwidth are obtained if a digital predistortion linearizer is implemented with an application specific digital signal processor, Th is paper investigates the quantization effects in different parts of a table based complex gain predistortion linearizer, The analysis can b e used to optimize the predistortion linearizer with respect to wordle ngth based on the knowledge of the RF amplifier gain characteristic, t he probability density function for the modulation scheme and the maxi mum allowable adjacent channel interference level, A predistorter chip is described that has been designed using the analysis, The chip has been fabricated and tested, Compared with a standard digital signal pr ocessing (DSP) solution it provides seven times higher bandwidth but c onsumes only 10% of the power.