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A fully matched N-way Doherty amplifier with optimized linearity986

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 51, NO. 3, MARCH 2003

A Fully Matched N -Way Doherty Amplifier With Optimized Linearity
Youngoo Yang, Member, IEEE, Jeonghyeon Cha, Bumjae Shin, and Bumman Kim, Senior Member, IEEE
Abstract―This paper presents a new fully matched -way Doherty amplifier. The basic principles of operation and important features are described. For the experimental verification, 2.14-GHz Doherty amplifiers having two-, three-, and four-way structures are implemented using silicon LDMOSFETs and tested using down-link WCDMA signal. The linearity performances of the two-, three-, and four-way Doherty amplifiers are optimized for better efficiency versus linearity by a bias adjustment of the peaking amplifiers. For simultaneously improving the effici