A 4.6-mW 45-GHz compact-size darlington-pair LC-VCO in 0.18-μm cmos technology

H. K. Chiou, H. T. Chou

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


This work proposes a 45-GHz Darlington-pair voltage-controlled oscillator (VCO) in 0.18-μm CMOS process. The Darlington-pair transistors achieve a 10.3-GHz higher unit gain cutoff frequency (fT) and lower negative resistance than those obtained in single MOS counterpart. This feature lowers the minimum current to start oscillation and hence reduces the power consumption in millimeter-wave frequency regime. Meanwhile, a high-Q straight transmission line is used to replace the inductor of the VCO resonator and achieves a good phase noise of -106.3 dBc/Hz at 10 MHz offset. The achieved figure-of-merit is -172.7 dBc/Hz while consumes a low direct current (DC) power consumption of 4.6 mW from a 1.5 V supply. The chip size including all pads is 0.19 mm2.

Original languageEnglish
Pages (from-to)648-652
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number3
StatePublished - Mar 2013


  • cutoff frequency
  • Darlington-pair
  • low power
  • millimeter wave


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