Lossless inductor current control in envelope tracking supply modulator with self-allocation of energy for optimzation of efficiency and EVM

Shang Hsien Yang, Ke-Horng Chen, Chin Long Wey, Ying Hsi Lin, Jian Ru Lin, Tsung Yen Tsai

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Conventional hybrid supply modulator for envelope tracking (ET) technique requires the linear amplifier to track a RF envelop signal with the help of switching converter to provide average power for high efficiency. Any distortion caused by resistive and inaccurate current sensing will result in increase of power loss and Error Vector Magnitude (EVM). Thus, a lossless inductor current control (LICC) with a closed-loop self-allocation technique is proposed to increase efficiency and decrease the EVM. Inductor current ripple information is directly extracted from the gate drive signal of a class-AB linear amplifier and a weighted self-allocation control is applied to optimize for efficiency and EVM. Extra power improvement of 2.5% can be derived. Owing to the removal of a power-consuming sensing resistor in conventional design, the efficiency can be effectively improved. The proposed supply modulator is capable of delivering an instantaneous peak power of 3.36W and a bandwidth of 20MHz with an averaged efficiency up to 85%.

Original languageEnglish
Title of host publication2016 IEEE Asian Solid-State Circuits Conference, A-SSCC 2016 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages281-284
Number of pages4
ISBN (Electronic)9781509037001
DOIs
StatePublished - 6 Feb 2017
Event12th IEEE Asian Solid-State Circuits Conference, A-SSCC 2016 - Toyama, Japan
Duration: 7 Nov 20169 Nov 2016

Publication series

Name2016 IEEE Asian Solid-State Circuits Conference, A-SSCC 2016 - Proceedings

Conference

Conference12th IEEE Asian Solid-State Circuits Conference, A-SSCC 2016
CountryJapan
CityToyama
Period7/11/169/11/16

Keywords

  • envelope tracking (ET) technique
  • lossless inductor current control (LICC) technique
  • supply modulator

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