2007•Electronics LettersRequires access

Design of N -way distributed Doherty amplifier for WCDMA and OFDM applications

K.J. Cho, W.J. Kim, Shawn P. Stapleton, J.H. Kim, Byunghyun Lee, J.J. Choi, Ji‐Yeon Kim, J.C. Lee

Abstract

A novel three-way distributed Doherty power amplifier with an extended efficiency range for WCDMA or OFDM repeater or base-station applications is presented. This distributed Doherty amplifier consists of one main amplifier and two peaking amplifiers. To achieve high efficiency at a high back-off power, the peaking amplifier structure is based on the dual-fed distributed amplifier form. The 2140 MHz measured results of the three-way distributed Doherty amplifier yielded an 11 dB power gain, with 39.5% power added efficiency at 9.5 dB back-off power.

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Key concepts: Doherty amplifier, Amplifier, Linear amplifier, Power-added efficiency, RF power amplifier, Direct-coupled amplifier, Electrical engineering, Cascade amplifier