A low phase noise FBAR based multiband VCO design

Guoqiang Zhang, Abhay Kochhar, Keiji Yoshida, Shuji Tanaka, Kenya Hashimoto, Masayoshi Esashi, Haruichi Kanaya, Ramesh K. Pokharel

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


In this letter, design methodlogy of a low phase noise multiband film bulk acoustic resonator (FBAR) based voltage controlled oscillator (FBAR-VCO) is presented. It employs a 1.9GHz cross-coupled FBAR-VCO core, and extends oscillation to 0.65GHz, 0.98GHz, 1.96GHz and 3.92GHz by a divider and a multiplier. By analyzing the low frequency instability and proposing the solution based on a capacitor, cross-coupled architecture is employed in 1.9GHz FBAR-VCO core and phase noise degradation is extensively studied for extended frequencies. By considering the effect of transistors' size on the Q-factor and impedance of FBAR, excellent phase noise and high loop gain are obtained. The post-layout simulation shows the proposed multiband FBAR-VCO achieves the lowest phase noise below 150dBc/Hz at 1MHz offset frequency.

Original languageEnglish
Article number20130425
JournalIEICE Electronics Express
Issue number13
Publication statusPublished - 2013


  • FBAR
  • Low frequency instability
  • Low phase noise
  • Multiband
  • VCO


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