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

Research output: Contribution to journalArticlepeer-review

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 <formula> <tex>${V_{{NEG}}}$</tex> </formula> and achieve fast down tracking. With the insertion of <formula> <tex>${V_{{NEG}}}$</tex> </formula> , the negative slope of <formula> <tex>${I_{{BUCK}}}$</tex> </formula> becomes 25&#x0025; larger. <formula> <tex>${V_{{NEG}}}$</tex> </formula> is also used to boost the input voltage of buck converter from 2 <formula> <tex>${V_{{BAT}}}$</tex> </formula> to 2.6 <formula> <tex>${V_{{BAT}}}$</tex> </formula> and raise the positive slope of <formula> <tex>${I_{{BUCK}}}$</tex> </formula> by 93&#x0025;, which improves the transient response of buck converter and decreases <formula> <tex>${| I_{{LA}}|}$</tex> </formula> by 37&#x0025;. With energy recycling and high-bandwidth LA replica, ETSM supports 150-MHz 5G new radio (5G NR) application and achieves 89.7&#x0025; 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)1
Number of pages1
JournalIEEE Journal of Solid-State Circuits
DOIs
StateAccepted/In press - 2022

Keywords

  • 5G mobile communication
  • 5G new radio (5G NR)
  • Bandwidth
  • Buck converters
  • Capacitors
  • Couplings
  • energy recycling
  • envelope tracking (ET)
  • fast transient buck converter
  • high-bandwidth linear amplifier (LA).
  • Recycling
  • Voltage control

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