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A 27-GHz low-power push-push LC VCO with wide tuning range in 65nm CMOS

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3 Author(s)
Molavi, R. ; Dept. of Electr. & Comput. Eng., Univ. of British Columbia, Vancouver, BC, Canada ; Mirabbasi, S. ; Djahanshahi, H.

Push-push voltage-controlled oscillators (VCOs) achieve high oscillation frequencies by relying on the boosted second harmonic component of the oscillator. These VCOs however, typically require a high power to deliver a reasonable output swing. In this paper, we first derive an analytical expression that relates the amplitude of the second harmonic of an LC VCO to the C-V characteristics of its varactor. Then based on the results of the analysis, we present the design of a low- power and compact 27-GHz push-push VCO in 65 nm CMOS that exhibits a 28.5% tuning range while consuming 21 mW (including buffers) from a 1 V supply. At 27-GHz output, the VCO achieves a phase noise of -101 dBc/Hz at 1-MHz offset.

Published in:

Circuits and Systems (ISCAS), 2011 IEEE International Symposium on

Date of Conference:

15-18 May 2011