IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
A low phase noise FBAR based multiband VCO design
Guoqiang ZhangAbhay KochharKeiji YoshidaShuji TanakaKenya HashimotoMasayoshi EsashiHaruichi KanayaRamesh K. Pokharel
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2013 Volume 10 Issue 13 Pages 20130425


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.

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© 2013 by The Institute of Electronics, Information and Communication Engineers
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