Broadband CMOS schottky-diode star mixer using coupled-CPW Marchand Dual-Baluns

Yu Chih Hsiao, Chin-Chun Meng*, Yong Hao Peng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


A broadband CMOS Marchand dual-balun using stacked broadside couplers for low odd-mode impedance with surrounded ground planes for high even-mode impedance is employed to achieve a high coupling coefficient needed for a Marchand dual-balun. The demonstrated Marchand dual-balun using 0.18-μm CMOS technology is designed at 30-GHz center frequency with an insertion loss of 11.5- and 10-dB input return loss bandwidth of over 120%. The bandwidth of 1-dB amplitude imbalance and 10° phase difference are over 100%. A broadband CMOS Schottky-diode star mixer is implemented with two Marchand dual-baluns at RF and local oscillator (LO) ports. As a result, the Schottky-diode star mixer shows conversion loss of 14 dB, LO-to-RF isolation of 26 dB, LO-to-IF isolation of 45 dB, and RF-to-IF isolation of 42 dB within 27-GHz operating bandwidth, respectively.

Original languageEnglish
Article number7907298
Pages (from-to)500-502
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number5
StatePublished - 1 May 2017


  • Coupled coplanar waveguide
  • Marchand dual-balun
  • Schottky diode
  • Star mixer

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