The Methods of Maintaining Low Frequency Stability in FBAR Based Cross-coupled VCO Design

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概要

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• 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 1 MHz offset frequency, and much better FOM below -210 dB.

著者

• Esashi Masayoshi

  Graduate School Of Engineering Tohoku University

• Yoshida Keiji

  Graduate School Of Information Science And Electrical Engineering Kyushu Unversity

• Tanaka Shuji

  Graduate School Of Eng. Tohoku University

• ESASHI Masayoshi

  Graduate School of Engineering, Tohoku University

• Yoshida Keiji

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Zhang Guoqiang

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Kochhar Abhay

  Graduate School of Engineering, Tohoku University

• Hashimoto Kenya

  Graduate School of Engineering, Chiba University

• Pokharel Ramesh

  Graduate School of Information Science and Electrical Engineering, Kyushu University

• Tanaka Shuji

  Graduate School of Engineering, Tohoku University

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