Low-phase-noise transformer-based top-series QVCO using GaInP/GaAs HBT technology

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The fully integrated GaInP/GaAs heterojunction bipolar transistor, transformer-based top-series quadrature voltage controlled oscillator (QVCO) is demonstrated at 4 GHz. The transformers on the semi-insulating GaAs substrate possess good electrical properties at high frequencies. The QVCO at 4.1 GHz has phase noise of -120 dBc/Hz at I MHz offset frequency, output power of 2 dBm and the figure of merit -178 dBc/Hz.

Original languageEnglish
Pages (from-to)215-218
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number1
StatePublished - 1 Jan 2007


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

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