1. A NOVEL N-WAY DISTRIBUTED DOHERTY AMPLIFIER WITH IMPROVED EFFICIENCY AT HIGH PAR SIGNALS.
- Author
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Kyoung-Joon Cho, Wan-Jong Kim, Ji-Yeon Kim, Jong-Heon Kim, and Stapleton, Shawn P.
- Subjects
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POWER amplifiers , *MICROWAVE amplifiers , *MICROWAVE devices , *DISTRIBUTED amplifiers , *LINEAR statistical models , *SIGNALS & signaling , *ELECTRONIC amplifiers , *RADIO frequency , *BROADBAND amplifiers , *RATIO measurement - Abstract
A novel three-way distributed Doherty power amplifier, with improved efficiency at high peak-to-average ratio (PAR) signals such as W-CDMA and OFDM, is presented. This distributed Doherty amplifier consists of one main amplifier and two peaking amplifiers. In order to improve the efficiency at a high back-off power, the peaking amplifier structure is based on a dual-fed distributed amplifier form. The results of the three-way distributed Doherty amplifier, measured at 2140 MHz, produced a power gain of 11 dB. At that point, a power-added efficiency (PAE) of 39.5 percent was measured for a 9.5 dB PAR signal. A high linearity peiformance of -54 dBc ACPR is achieved after using memory-compensated digital predistortion. [ABSTRACT FROM AUTHOR]
- Published
- 2008