Three-band high-efficiency modulator for envelope tracking power amplifier using class-B push-pull amplifiers

Jiafeng Zhou*, Kevin Morris, Gavin Watkins, Keiichi Yamaguchi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

1 Citation (Scopus)

Abstract

Envelope modulators for wideband and high- power envelope tracking or envelope elimination and restoration amplifiers are usually realized by combing a switching stage and a linear stage. The efficiency and bandwidth of the modulator is mainly limited by the linear stage. This paper proposes a method to improve the performance of the linear stage by adding another stage. The third stage is a push-pull amplifier biased in class-B mode. The push-pull amplifier can achieve a peak efficiency of 76%, and well above 60% over the envelope frequencies from 1MHz to 20MHz. By adding this push-pull amplifier, the three-band modulator can achieve a peak efficiency of 81% and an effective efficiency of 73% for 10MHz and 20MHz LTE signals with 30W output power. The linearity of the push-pull amplifier and the three-band modulator has been evaluated. The three-band modulator has also been tested by driving a class-E amplifier at 2.06GHz to validate the design

Original languageEnglish
Title of host publicationEuropean Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 42nd European Microwave Conference, EuMC 2012
Pages124-127
Number of pages4
Publication statusPublished - 2012
Event2012 42nd European Microwave Conference, EuMC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012 - Amsterdam, Netherlands
Duration: 29 Oct 20121 Nov 2012

Conference

Conference2012 42nd European Microwave Conference, EuMC 2012 - Held as Part of 15th European Microwave Week, EuMW 2012
CountryNetherlands
CityAmsterdam
Period29/10/121/11/12

Keywords

  • class-B
  • class-E
  • envelope elimination and restoration
  • envelope modulator
  • Envelope tracking
  • PAE
  • power amplifiers
  • push-pull
  • SMPS

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