IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
An asynchronous dual switch envelope tracking supply modulator with 86% efficiency
Dong ChenChenxi ZhaoYitong XiongYunqiu WuYongling BanYing LiuHuihua LiuKai Kang
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2018 Volume 15 Issue 8 Pages 20180206

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Abstract

An asynchronous dual-switch hybrid envelope tracking (ET) supply modulator is proposed in this paper. Two high-efficiency switching amplifiers (SA) working at different speed are adopted to reduce the current supplied by the linear amplifier (LA), which improves the efficiency of the supply modulator. A highly reliable control circuit is presented to make the SAs work asynchronously. Measured with 20 MHz LTE signal, the proposed supply modulator’s average efficiency reaches 86% when the output power is 29.7 dBm. The supply modulator is fabricated in 180 nm CMOS technology with 0.7 × 0.7 mm2 die area.

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© 2018 by The Institute of Electronics, Information and Communication Engineers
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