60-GHz dual-conversion down-/up-converters using schottky diode in 0.18 μm foundry CMOS technology

Hung Ju Wei*, Chin-Chun Meng, Ta Wei Wang, Tai Lin Lo, Chia Ling Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Due to the benefits of Schottky diodes, 0.18-μm CMOS technology is being promoted for millimeter wave applications. In this paper, 60-GHz dual-conversion down-/up-converters using Schottky diodes are realized by using 0.18-μm foundry CMOS technology. A CoSi 2-Si Schottky diode, fabricated on a lower doped N-well by blocking the threshold voltage adjustment implant, has a lower reverse leakage current and a better ideality factor. Thus, it is ideal for the 60-GHz sub-harmonic mixer design. Two new types of Schottky-diode mixers, a down-conversion sub-harmonic mixer with a dual-band lump-distributed phase-inverter rat-race coupler and an up-conversion sub-harmonic mixer with a trifilar transformer, are realized and employed at the high-frequency conversion stage of the dual-conversion architecture to achieve small size and broadband isolations. The silicon-based Schottky diode with a low turn-on voltage offers great advantage in LO pumping power, especially for an antiparallel diode pair structure. In our Schottky-diode sub-harmonic mixers, the required LO power is only 1 dBm. The dual-conversion down-converter achieves 5-dB conversion gain and 19 dB noise figure under V dd = 2.5 V and Idd = 22 mA, and the dual-conversion up-converter, with V dd = 2.5 V and I dd = 26 mA, attains greater than 40-dB sideband rejection and-1 dB conversion gain over the whole 60-GHz bandwidth.

Original languageEnglish
Article number6172539
Pages (from-to)1684-1698
Number of pages15
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number6 PART 1
StatePublished - 27 Mar 2012


  • 0.18-μm foundry CMOS technology
  • 60-GHz
  • Converter
  • dual conversion
  • mixer
  • phase-inverter rat-race coupler
  • Schottky diode
  • single-sideband rejection
  • sub-harmonically pumped mixer
  • trifilar transformer

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