Analog pre-distortion linearizer using self base bias controlled amplifier

Shintaro Shinjo, Kazutomi Mori, Keiki Yamada, Noriharu Suematsu, Mitsuhiro Shimozawa

Research output: Contribution to journalArticle

Abstract

An analog pre-distortion linearizer employing a radio frequency (RF) transistor with a self base bias control circuit is proposed. The self base bias control circuit extracts the envelope from the modulated input RF signal of the RF transistor and automatically controls its base current according to the extracted envelope. As a result, the proposed linearizer realizes positive gain deviation at high input power level. By adding a resistor between the RF transistor and the self base bias control circuit, the negative gain deviation can be derived. The design of the proposed lineaizer is described with taking the envelope frequency response of the self base bias control circuit into consideration. The fabricated linearizer achieves the adjacent channel power leakage ratio (ACLR) improvement of 8.1 dB for a 2 GHz-band, 10 W-class GaAs FET high-power amplifier (HPA) with negative gain deviation for W-CDMA base stations. It also achieves the ACLR improvement of 8.3 dB for a LDMOS HPA with positive gain deviation for the same application.

Original languageEnglish
Pages (from-to)966-974
Number of pages9
JournalIEICE Transactions on Electronics
VolumeE93-C
Issue number7
DOIs
Publication statusPublished - 2010 Jul
Externally publishedYes

Keywords

  • Distortion
  • Envelope
  • Linearizer
  • Microwave
  • Power amplifier
  • Silicon

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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