A HIGHLY LINEAR AND EFFICIENT TWO-STAGE GaN HEMT ASYMMETRICAL DOHERTY AMPLIFIER FOR WCDMA APPLICATIONS

Abstract

In this article, we propose a highly linear and efficient two-stage GaN HEMT asymmetrical Doherty power amplifier (ADPA) for WCDMA applications. The first-stage driving DPA not only improves the linearity as the predistortion circuit but also reduces the power consumption in the driving stage. The second-stage main ADPA is optimized to achieve high efficiency at a 10-dB back-off power. (c) 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1464-1467, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24387