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A 2.4 GHz low-power low-phase-noise CMOS VCO using spiral inductors and junction varactors

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2 Author(s)
Jie Long ; Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA ; Weber, R.J.

A completely integrated 2.4 GHz low-power low-phase-noise voltage-controlled oscillator (VCO) was implemented in a standard 0.18 μm single-poly, 6-metal mixed-signal CMOS process. It employs junction varactors as voltage-controlled capacitances along with on-chip spiral inductors to form the LC-tank. The VCO-core draws 1.8 mA of current from a 1.2 V supply. Simulated phase noise is shown as -101.9 dBc/Hz at a 100 kHz offset from the carrier frequency of 2.4 GHz, and -122.1 dBc/Hz at a 1MHz offset. Comparison shows that this design has better performance than previously published similar results. This circuit is in process of being fabricated through the MOSIS Educational Program.

Published in:

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on  (Volume:4 )

Date of Conference:

23-26 May 2004