A 20MHz Low Dropout Controlled Current Sensor for Constant On-Time Based Envelop Tacking Supply Modulator for Radio Frequency Power Amplifier

Wei Ting Lin, Zong Yi Lin, Chia Hao Liu, Ke-Horng Chen, Ying Hsi Lin, Jian Ru Lin, Tsung Yen Tsai

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

Abstract

This paper presents a LDO-controlled current sensor for accelerating constant on-time (COT) switching regulators (SWRs) for high efficiency envelope tracking power modulators (ETSMs) for RF power amplifiers (RF PAs). The proposed LDO-controlled current sensor controls the feedback loop of the SWR, rather than the traditional current sensing technique, in the case of fast envelope tracking. The LDO regulator behaves as the master to rapidly trigger the SWR as a slave energy provider to rapidly deliver the average energy to the RF PA for high efficiency. The experimental results show that the test chip fabricated in 0.18μm CMOS process can accurately track the RF envelope signal, and the peak efficiency is 86.7% when the power is 0.95W.

Original languageEnglish
Title of host publication2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538648810
DOIs
StatePublished - 26 Apr 2018
Event2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Florence, Italy
Duration: 27 May 201830 May 2018

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2018-May
ISSN (Print)0271-4310

Conference

Conference2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
CountryItaly
CityFlorence
Period27/05/1830/05/18

Keywords

  • Envelope tracking
  • low dropout (LDO)-controlled current sensor
  • switching regulator (SWR) with capacitor multiplier

Fingerprint Dive into the research topics of 'A 20MHz Low Dropout Controlled Current Sensor for Constant On-Time Based Envelop Tacking Supply Modulator for Radio Frequency Power Amplifier'. Together they form a unique fingerprint.

Cite this