An asynchronous dual switch envelope tracking supply modulator with 86% efficiency

作者：Chen, Dong; Zhao, Chenxi; Xiong, Yitong; Wu, Yunqiu; Ban, Yongling; Li, Ying; Li, Huihua; Kan, Kai^*

来源：IEICE Electronics Express, 2018, 15(8): 20180206-20180206.

DOI：10.1587/elex.15.20180206

• envelope tracking
• power amplifier
• CMOS
• switch

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 arc 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 X 0.7 mm(2) die area.

• 出版日期2018-4-25
• 单位电子科技大学