A 5-GHz band low-phase noise CMOS VCO using above-IC technologies

Hwann Kaeo Chiou, Yuan Chia Hsu, Da Chiang Chang, Ying Zong Juang

Research output: Contribution to journalArticlepeer-review


This article presents a 5-GHz band low phase noise CMOS voltage controlled oscillator (VCO) based on a high quality factor above-IC inductor that is stacked on the top of a 0.18-μm RF CMOS process using wafer level package technology. The measured phase noise of the VCO is -119.8 dBc/Hz at 1 MHz offset frequency, which is an improvement of 6 dB compared to a conventional VCO with on-chip CMOS inductor. The design challenge of the grounding of the above-IC inductor stacked on the CMOS structure is investigated in this work.

Original languageEnglish
Pages (from-to)2051-2055
Number of pages5
JournalMicrowave and Optical Technology Letters
Issue number9
StatePublished - Sep 2013


  • above-IC
  • inductor
  • phase noise
  • voltage-controlled oscillator


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