A 38-46 GHz MMIC Doherty power amplifier using post-distortion linearization

Jeng Han Tsai, Tian Wei Huang

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

This letter describes the first demonstration of a fully integrated Doherty power amplifier (PA) monolithic microwave integrated circuit (MMIC) with post-distortion linearization at millimeter-wave (MMW) frequency band. The Doherty amplifier MMIC, using a 0.15-μm GaAs HEMT process, achieves a small signal gain of 7 dB from 38 to 46 GHz with a compact chip size of 2 mm 2. The saturation output power of the Doherty amplifier is 21.8 dBm. The similar topology between the Doherty amplifier and post-distortion linearization makes it possible to improve efficiency and linearity simultaneously in MMW PA designs. After gate bias optimization of the main and peaking amplifier, the drain efficiency improved 6% at 6-dB output back-off and the inter-modulation distortion (IMD) of quasi Doherty amplifier can be improved 18 dB at 42 GHz compared with the balanced amplifier operation.

Original languageEnglish
Pages (from-to)388-390
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume17
Issue number5
DOIs
Publication statusPublished - 2007 May 1

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Keywords

  • Doherty amplifier
  • Millimeter-wave (MMW)
  • Monolithic microwave integrated circuit (MMIC)
  • Post-distortion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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