A silicon monolithic phase-inverter rat-race coupler using spiral coplanar striplines and its application in a broadband Gilbert mixer

Sheng Che Tseng*, Chin-Chun Meng, Chia Hung Chang, Shih Hsien Chang, Guo Wei Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

This paper realized a broadband uniplanar phase-inverter rat-race coupler using a standard silicon process, and then analyzed this coupler under a lossy condition. A phase inverter is employed in this coupler, not only to extend the operation bandwidth, but also to generate balanced outputs by providing equal lossy paths, while symmetrical spiral-shaped coplanar striplines (CPSs) are also utilized to shrink the coupler size, as well as to construct a phase inverter in the middle of one of spiral CPSs. The lossy CPS, when designed as a distortionless line, has a real characteristic impedance, and thus, perfect port matching of the coupler can be achieved at the center frequency. The operation frequency of this silicon monolithic rat-race coupler with the size of 0.5 mm2 is extremely wide and ranges from 5 to 23 GHz. The dissipated loss, transmission coefficient, and isolation of the ratrace coupler are approximately 5.5, -8, and below -25 dB, respectively. In addition, a wideband Gilbert micromixer with an integrated uniplanar phase-inverter rat-race coupler at the local oscillator port is demonstrated using 0.35-/zm SiGe BiCMOS technology. This mixer works from 2.5 to 13 GHz with 12-dB conversion gain, -16-dBm IP1 dB, -4-dBm IIP3, and 14-dB noise figure. The chip size of the mixer with an integrated coupler is approximately 1.4 mm x 1.4 mm.

Original languageEnglish
Article number4560049
Pages (from-to)1879-1888
Number of pages10
JournalIEEE Transactions on Microwave Theory and Techniques
Volume56
Issue number8
DOIs
StatePublished - 1 Aug 2008

Keywords

  • Downconverter
  • Micromixer
  • Phase inverter
  • Rat-race coupler
  • SiGe BiCMOS
  • Silicon substrate
  • Transimpedance amplifier
  • Wideband

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