An Energy Recycling Envelope Tracking Supply Modulator Assisted by Small Cap Replica With 89.7% Efficiency and 37% Reduced Linear Amplifier Current for 150 MHz Bandwidth 5G New Radio RF Applications

Chong Sin Huang, Tzu Yu Tzeng, Wei Cheng Huang, Yi Hsiang Kao, Jie Lin Wu, Ke Horng Chen*, Ying Hsi Lin, Shian Ru Lin, Tsung Yen Tsai

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This article proposes an envelope tracking supply modulator (ETSM) that recycles the originally wasted energy in the linear amplifier (LA) to generate negative voltage $V_{\mathrm {NEG}}$ and achieve fast down tracking. With the insertion of $V_{\mathrm {NEG}}$ , the negative slope of $I_{\mathrm {BUCK}}$ becomes 25% larger. $V_{\mathrm {NEG}}$ is also used to boost the input voltage of buck converter from 2 $V_{\mathrm {BAT}}$ to 2.6 $V_{\mathrm {BAT}}$ and raise the positive slope of $I_{\mathrm {BUCK}}$ by 93%, which improves the transient response of buck converter and decreases $\vert I_{\mathrm {LA}}\vert $ by 37%. With energy recycling and high-bandwidth LA replica, ETSM supports 150-MHz 5G new radio (5G NR) application and achieves 89.7% efficiency when output power is 3.7 W. In addition, the proposed differential feedforward technique controls the operation of energy recycling precisely with the calibration logic.

Original languageEnglish
Pages (from-to)3361-3369
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Volume57
Issue number11
DOIs
StatePublished - 1 Nov 2022

Keywords

  • 5G new radio (5G NR)
  • energy recycling
  • envelope tracking (ET)
  • fast transient buck converter
  • high-bandwidth linear amplifier (LA)

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