A Zero-Voltage-Switching Contour-Based Outphasing Power Amplifier

作者：Singhal Nitesh^*; Zhang Haoxing; Pamarti Sudhakar

来源：IEEE Transactions on Microwave Theory and Techniques, 2012, 60(6): 1896-1906.

DOI：10.1109/TMTT.2012.2190747

• Peak-to-average power ratio (PAR)
• power amplifier (PA)
• zero voltage switching (ZVS)

A parallel class-E modified Chireix outphasing power amplifier (PA) that can maintain high efficiency across a wide output power range is presented. The architecture presented essentially implements a zero voltage switching (ZVS) contour-based PA using a modified Chireix outphasing structure. It utilizes the inherent load modulation present in the outphasing scheme and combines it with duty cycle modulation to satisfy ZVS conditions over a wide range of output powers. Thus, a ZVS contour-based PA is realized, and the amplifier maintains high efficiency for about 9-dB back-off of output power. Beyond the 9-dB range, simple outphasing is performed to extend the dynamic range up to about 30 dB. The proposed PA, implemented using discrete components on an FR4 printed circuit board, achieves a dynamic range of 30 dB with a peak power of 29 dBm and a peak drain efficiency of 65% at about 6-dB back-off from the peak output power at 100 MHz from a 3-V supply.

• 出版日期2012-6
• 单位浙江大学