The methods of maintaining low frequency stability in FBAR based cross-coupled VCO design

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

Research output: Contribution to journalLetterpeer-review

2 Citations (Scopus)

Abstract

In this letter, we propose the methods to mitigate low frequency instability in a film bulk acoustic resonator (FBAR) based cross-coupled voltage-controlled oscillator (FBAR-VCO). The first method employs a capacitor and while the other one employs a series inductor-capacitor. Using the post-layout simulation, a comparative study of the performances such as phase noise and figure of merit (FOM) of the designed FBAR-VCO is carried out. It is found that both the methods inhibit the low frequency instability successfully and the additional advantage of the second method is 2 dB improvement of FOM. Compared to other published FBAR-VCOs, this work has very low phase noise, below -150 dBc/Hz at 1MHz offset frequency, and much better FOM below -210 dB.

Original languageEnglish
JournalIEICE Electronics Express
Volume10
Issue number12
DOIs
Publication statusPublished - 2013 Jul 2

Keywords

  • Cross-coupled architecture
  • Film bulk acoustic resonator
  • Low frequency instability
  • Phase noise
  • VCO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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