Design of 1.2-V broadband high data-rate MMW CMOS I/Q modulator and demodulator using modified Gilbert-cell mixer

Jeng Han Tsai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Citations (Scopus)


In this paper, low-voltage evolution and high-speed operation mixer design are presented for millimeter-wave (MMW) CMOS in-phase/quadrature (I/Q) modulator and demodulator. The modified Gilbert-cell mixer architecture, which eliminates the three-level transistors stacking in the conventional Gilbert-cell mixer, can operate at a reduced supply voltage while maintaining reasonable performance. In addition, IF transimpedance amplifier buffer and wideband RF design are introduced to increase the operation speed of the mixer for MMW gigabit wireless transmission link applications. Using a 0.13-μm CMOS process, the I/Q modulator and demodulator formed with the modified Gilbert-cell mixers are demonstrated at the MMW. Under 1.2-V standard supply voltage, the modulator and demodulator exhibit excellent conversion gain (CG) flatness of -3.5 ± 1.5 dB and -3 ± 1.5 dB from 41 to 69.5 GHz and 31 to 69 GHz, respectively. For 60-GHz wireless personal area network applications, π/4 differential quadrature phase-shift keying, 16 quadrature amplitude modulation, and binary phase-shift keying modulation signal tests are successfully performed through the direct-conversion system. The results show that the presented monolithic microwave integrated circuits can operate at low-voltage and low-power while providing good CG and high data rate, even up to multigigabit.

Original languageEnglish
Article number5738364
Pages (from-to)1350-1360
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number5
Publication statusPublished - 2011 May


  • 60 GHz
  • CMOS
  • demodulator
  • direct conversion
  • gigabit
  • millimeter wave (MMW)
  • mixer
  • modulator

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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