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A 1.8-GHz low-phase-noise CMOS VCO using optimized hollow spiral inductors

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2 Author(s)
Craninckx, J. ; ESAT, Katholieke Univ., Leuven, Heverlee, Belgium ; Steyaert, M.S.J.

A completely integrated 1.8-GHz low-phase-noise voltage-controlled oscillator (VCO) has been realized in a standard silicon digital CMOS process. The design relies heavily on the integrated spiral inductors which have been realized with only two metal layers and without etching. The effects of high-frequency magnetic fields and losses in the heavily doped substrate have been simulated and modeled with finite-element analysis. The achieved phase noise is as low as -116 dBc/Hz at an offset frequency of 600 kHz, at a power consumption of only 6 mW. The VCO is tuned with standard available junction capacitances, resulting in a 250-MHz tuning range

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:32 ,  Issue: 5 )
RFIC Virtual Journal, IEEE

Date of Publication:

May 1997

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