1.8 GHz CMOS quadrature voltage-controlled oscillator (VCO) using the constant-current LC ring oscillator structure

Chung-Yu Wu*, Hong Sing Kao

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

13 Scopus citations

Abstract

A new fully integrated CMOS quadrature voltage-controlled oscillator (VCO) realized in a standard 0.5 μm double poly double metal (DPDM) CMOS technology is proposed, that combines a fully differential two-stage ring oscillator with LC tanks and negative resistance to provide both inphase and quadrature output signals. The phase noise is low due to the use of the resonator-type oscillator. The simulation results show that with an on-chip varactor tuned resonator and a control voltage of 0-3 V, the tuning range of the VCO is 160 MHz from 1.67 GHz to 1.83 GHz. Under 1% mismatch of the inductor or capacitor, the phase error of VCO outputs are less than 1° from perfect quadrature and the amplitude ratio are less than 1.0007. The power dissipation is 35 mW for 3 V power supply. The area is 1.3×0.9 mm2, dominated by the two integrated spiral inductors.

Original languageEnglish
Pages (from-to)378-381
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Volume4
DOIs
StatePublished - 1 Jan 1998
EventProceedings of the 1998 IEEE International Symposium on Circuits and Systems, ISCAS. Part 5 (of 6) - Monterey, CA, USA
Duration: 31 May 19983 Jun 1998

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