A highly-efficient BiCMOS cascode class-E power amplifier using both envelope-tracking and transistor resizing for LTE-like applications

Yan Li, Ruili Wu, Jerry Lopez, Donald Y.C. Lie

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

5 Scopus citations

Abstract

This paper presents the design of a SiGe differential cascode power amplifier (PA) to perform the envelope-tracking (ET) along with transistor resizing for efficiency enhancement for the 16QAM LTE. A new parallel-circuit class-E PA model is developed to analyze and design the cascode PA. The analytic results are compared with SPICE simulation and measurement data to provide circuit design insights. Measurement shows the ET-based PA system reaches an overall power-added-efficiency (PAE) of 38% at its 1 dB compression point (P 1dB) of 22 dBm for its high power mode. Additionally, at the low power mode, some of the transistor cells can be disabled by the integrated MOSFET switches, and the overall PAE is improved by 4-5% at ≥4 dB back-off from its P 1dB. This ET-based cascode PA satisfies the LTE 16QAM linearity specs without needing predistortions.

Original languageEnglish
Title of host publication2011 IEEE Bipolar/BiCMOS Circuits and Technology Meeting, BCTM 2011
Pages142-145
Number of pages4
DOIs
StatePublished - 2011
Event2011 25th IEEE Bipolar/BiCMOS Technology and Circuits Meeting, BCTM 2011 - Atlanta, GA, United States
Duration: Oct 9 2011Oct 11 2011

Publication series

NameProceedings of the IEEE Bipolar/BiCMOS Circuits and Technology Meeting
ISSN (Print)1088-9299

Conference

Conference2011 25th IEEE Bipolar/BiCMOS Technology and Circuits Meeting, BCTM 2011
CountryUnited States
CityAtlanta, GA
Period10/9/1110/11/11

Keywords

  • LTE
  • SiGe BiCMOS power amplifier (PA)
  • envelope-tracking (ET)
  • parallel-circuit class-E PA model
  • transistor resizing

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