Title :
A 1.8 GHz CMOS quadrature voltage-controlled oscillator (VCO) using the constant-current LC ring oscillator structure
Author :
Wu, Chung-Yu ; Kao, Hong-Sing
Author_Institution :
Inst. of Electron., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fDate :
31 May-3 Jun 1998
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 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
Keywords :
CMOS analogue integrated circuits; UHF integrated circuits; UHF oscillators; circuit tuning; radio receivers; transceivers; voltage-controlled oscillators; 0.5 micron; 1.8 GHz; 160 MHz to 1.67 GHz; 3 V; 35 mW; CMOS quadrature VCO; LC tanks; constant-current LC ring oscillator structure; direct conversion transceivers; double poly double metal; fully differential two-stage ring oscillator; fully integrated; integrated spiral inductors; low phase noise; negative resistance; on-chip varactor tuned resonator; resonator-type oscillator; CMOS technology; Capacitors; Inductors; Phase noise; Power dissipation; Ring oscillators; Tuning; Varactors; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.698867