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

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2 Author(s)
Chung-Yu Wu, Ph.D. ; Inst. of Electron., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Hong-Sing Kao

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 in-phase 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 errors 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

Published in:

Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on  (Volume:4 )

Date of Conference:

31 May-3 Jun 1998