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15 GHz-band low phase-noise LC-VCO with second harmonic tunable filtering technique

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5 Author(s)
Qing Liu ; Grad. Sch. of Inf., Production & Syst., Waseda Univ., Kitakyushu, Japan ; Jiangtao Sun ; Yoshimasu, T. ; Kurachi, S.
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In this paper, a novel technique is proposed to improve the phase-noise of an LC-VCO. The LC-VCO includes two series LC second harmonic filters which consist of a spiral inductor and two varactors. The resonant frequency of the series LC filter is tunable with the control voltage, and the resonator largely prevents the noise modulation in the LC-VCO, improving the phase-noise of the LC-VCO with wide frequency range. The LC-VCO is fabricated using 0.13 ¿m CMOS technology, and fully evaluated on wafer. The measured phase-noise of -112dBc/Hz at 1MHz offset from the 15 GHz carrier is obtained.

Published in:

Personal, Indoor and Mobile Radio Communications, 2009 IEEE 20th International Symposium on

Date of Conference:

13-16 Sept. 2009