A 5.2 GHz 47 dB image rejection double quadrature gilbert downconverter using 0.35 μm SiGe HBT technology

Tzung Han Wu, Chin-Chun Meng, Tse Hung Wu, Guo Wei Huang

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A 5.2 GHz 1 dB conversion gain, IP1 dB = -19 dBm and IIP 3 = -9 dBm double quadrature Gilbert downconversion mixer with polyphase filters is demonstrated by using 0.35 μm SiGe HBT technology. The image rejection ratio is better than 47 dB when LO=5.17 GHz and IF is in the range of 15 MHz to 45 MHz. The Gilbert downconverter has four-stage RC-CR IF polyphase filters for the image rejection. Polyphase filters are also used to generate LO and RF quadrature signals around 5 GHz in the double quadrature downconverter.

Original languageEnglish
Pages (from-to)401-405
Number of pages5
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE90-A
Issue number2
DOIs
StatePublished - 1 Jan 2007

Keywords

  • Double quadrature downconverter
  • Gilbert mixer
  • Image rejection
  • Polyphase filter
  • SiGe BiCMOS

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