Predistortion linearization system for high power amplifiers

This paper presents an adaptive wideband, digitally controlled RF envelope predistortion linearization system for high power amplifiers. The advantages of this predistortion architecture over conventional baseband digital approaches are that a 20∼33% wider correction bandwidth is achievable at the same clock speeds, and it can perform linearization without the need for a digital baseband input signal. Using 3-carrier CDMAOne and wideband multi-tone signals, the linearization performances for a 90W PEP LDMOS PA and a 680W PEP LDMOS PA were examined.