A 5.2-GHz GaInP/GaAs HBT double-quadrature downconverter with polyphase filters for 40-dB image rejection

Chin-Chun Meng*, D. W. Sung, G. W. Huang

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

A 5.2-GHz 11-dB gain, IP1 dB = -17 dBm and IIP3 = -10 dBm double-quadrature Gilbert downconversion mixer with polyphase filters is demonstrated by using GaInP/GaAs heterojunction bipolar transistor (HBT) technology. The image rejection ratio is better than 40 dB when LO = 5.17 GHz and intermediate frequency (IF) is in the range of 15 MHz to 40 MHz. The Gilbert downconverter has four-stage RC-CR IF polyphase filters for image rejection. Polyphase filters are also used to generate local (LO) and radio frequency (RF) quadrature signals around 5 GHz in the double-quadrature downconverter because GaAs has accurate thin film resistors and the low parasitic semi-insulating substrate.

Original languageEnglish
Pages (from-to)59-61
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume15
Issue number2
DOIs
StatePublished - 1 Feb 2005

Keywords

  • Double-quadrature downconverter
  • GaInP/GaAs heterojunction bipolar transistor (HBT)
  • Gilbert mixer
  • Image rejection
  • Polyphase filter

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