C-band fully integrated SiGe HBT superharmonic QVCO

S. C. Tseng*, Chin-Chun Meng, Y. W. Chang, G. W. Huang

*Corresponding author for this work

Research output: Contribution to journalArticle


This paper demonstrates a 4-GHz monolithic SiGe heterojunction bipolar transistor quadrature voltage-controlled oscillator (QVCO) using superharmonic coupling topology. The QVCO at 4.17 GHz has phase noise of -116 dBc/Hz at 1 MHz offset frequency, output power of -6 dBm, and the figure of merit -179 dBc/Hz. The core current consumption is 3.2 mA at 3 V supply voltage. The die size is about 1.4 mm × 1.2 mm.

Original languageEnglish
Pages (from-to)867-869
Number of pages3
JournalMicrowave and Optical Technology Letters
Issue number4
StatePublished - 1 Apr 2007


  • Phase noise
  • Quadrature voltage-controlled oscillator (QVCO)
  • SiGe heterojunction bipolar transistor (HBT)
  • Superharmonic coupling
  • Transformer

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