5.7 GHz Gilbert I/Q downconverter integrated with a passive LO quadrature generator and an RF Marchand balun

Jin Siang Syu*, Chin-Chun Meng, Ying Chieh Yen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

A 5.7 GHz I/Q downconversion mixer is demonstrated in this letter using 0.35 μm SiGe BiCMOS technology. A quarter-wavelength coupled line and two center-tapped transformers are utilized to generate differential quadrature LO signals. A miniaturized Marchand balun is placed before the common-base- configured RF input stage of each I/Q Gilbert mixer to generate balanced RF signals. All the reactive passive elements are placed directly on the standard silicon substrate. The 5.7 GHz I/Q downconverter achieves 7 dB conversion gain, -26 dBm IP 1dB , and -18 dBm IIP 3 at the power consumption of 3.875 mW and 2.5 V supply voltage.

Original languageEnglish
Pages (from-to)127-129
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume18
Issue number2
DOIs
StatePublished - 1 Feb 2008

Keywords

  • Gilbert mixer
  • I/Q downconverter
  • Marchand balun
  • SiGe BiCMOS

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