4.9-GHz low-phase-noise transformer-based superharmonic-coupled GaInP/GaAs HBT QVCO

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

*Corresponding author for this work

Research output: Contribution to journalArticle

18 Scopus citations


The low-phase-noise GaInP/GaAs heterojunction bipolar transistor (HBT) quadrature voltage controlled oscillator (QVCO) using transformer-based superharmonic coupling topology is demonstrated for the first time. The fully integrated QVCO at 4.87 GHz has phase noise of -131 dBc/Hz at 1-MHz offset frequency, output power of -4 dBm and the figure of merit (FOM) - 198 dBc/Hz. The state-of-the-art phase noise FOM is attributed to the superior GaInP/GaAs HBT low-frequency device noise and the high quality transformer formed on the GaAs semi-insulating substrate.

Original languageEnglish
Article number1637488
Pages (from-to)339-341
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number6
StatePublished - 1 Jun 2006


  • GaInP/GaAs heterojunction bipolar transistor (HBT)
  • Phase noise
  • Quadrature voltage controlled oscillator (QVCO)
  • Superharmonic coupling
  • Transformer

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