Quasi-constant-sensitivity VCO with offset-tuning PN junction varactor array

Sung Huang Lee, Yueh Ta Chiang, Hwann Kaeo Chiou

Research output: Contribution to journalArticlepeer-review


A quasi-constant-sensitivity voltage-controlled oscillator ( VCO) using an offset-tuning junction varactor array is demonstrated with low standard deviation of 4.5 MHz/V and average sensitivity of 41 MHz/V. The varactor array utilizing PN-junction varactors provides high-linear capacitor-voltage response and low sensitivity variation. The VCO has a figure-of-merit (FOM) value, FOMKvco' of 0.11 and phase noise of -120 dBc/Hz at 1-MHz offset.

Original languageEnglish
Pages (from-to)1063-1066
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number6
StatePublished - Jun 2006


  • Quasi-constant sensitivity
  • Varactor array
  • Voltage-controlled oscillator


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