Analog predistortion power amplifiers using IMD sweet spots for WCDMA applications

Abstract

An analog predistortion power amplifier (PA) using inter-modulation distortion (IMD) sweet spots for linearity improvement in wide-band code division multiple access (WCDMA) applications is represented. A third-order predistorter is used to cancel the IM3 components when the IM5 components are significantly reduced by the IMD5 sweet spots of the PA. For experimental validation, a 30-W PEP LD-MOSFET PA is implemented and tested for two-tone and 4-carrier WC-DMA signals at 2.14 GHz. The measured results show that the notable linearity improvement is obtained over a whole output power range. (C) 2007 Wiley Periodicals, Inc.