A Zero-Voltage-Switching Contour-Based Power Amplifier With Minimal Efficiency Degradation Under Back-Off

被引：20

作者：

Singhal, Nitesh ^{[1
]}

Nidhi, Nitin ^{[1
]}

Patel, Rishi ^{[1
]}

Pamarti, Sudhakar ^{[1
]}

机构：

[1] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2011年 / 59卷 / 06期

关键词：

Peak-to-average power ratio (PAR); peak-to-minimum power ratio (PMR); power amplifier (PA); zero voltage switching (ZVS); TRANSFORMER;

D O I：

10.1109/TMTT.2011.2131677

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A switching power amplifier (PA) architecture that offers up to 13 dB of output power back-off without any drain efficiency degradation is presented. The proposed zero-voltage-switching (ZVS) contour-based PA employs a series class-E PA in conjunction with duty cycle modulation and a proposed tunable impedance transformation network. So-called ZVS conditions that ensure ideally 100% drain efficiency are satisfied not just at peak output power, but over the 13-dB back-off range. Theoretical analyses of losses in the PA and the impedance transformation network are also presented to prove that drain efficiency actually improves with back-off. Measurement results of a 100-MHz PA built using discrete components on an FR4 printed circuit board showing drain efficiency greater than or equal to the peak efficiency (40%) at all output power levels are also presented.

引用

页码：1589 / 1598

页数：10

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