A low power 2.2-2.6GHz CMOS VCO with a symmetrical spiral inductor

A low power consumption monolithic LC-tank voltage controlled oscillator (VCO) fabricated in a mixed-signal/RF 0.25/spl mu/m CMOS technology is presented. The VCO is implemented with one completely symmetrical spiral inductor, and shows a phase noise under -119 dBc/Hz at a 1 MHz offset frequency across the whole operating band. The proposed VCO, with wide tuning range and small silicon size, is well suitable for the system integration of wireless systems such as Bluetooth and DECT.

[1]  A.L. Lacaita,et al.  Integrated LC oscillators for frequency synthesis in wireless applications , 2002, IEEE Communications Magazine.

[2]  Bingxue Shi,et al.  Integrated 2.4 GHz CMOS quadrature VCO with symmetrical spiral inductors and differential varactors , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).

[3]  H. Sjoland,et al.  High performance 1 V 2.4 GHz CMOS VCO , 2002, Proceedings. IEEE Asia-Pacific Conference on ASIC,.

[4]  M. Steyaert,et al.  A fully integrated CMOS DCS-1800 frequency synthesizer , 1998, 1998 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, ISSCC. First Edition (Cat. No.98CH36156).

[5]  M. Thompson,et al.  A 0.18 /spl mu/m CMOS 2.45 GHz, low-power quadrature VCO with 15% tuning range , 2002, 2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280).

[6]  R. Castello,et al.  A bond-wire inductor-MOS varactor VCO tunable from 1.8 to 2.4 GHz , 2002 .

[7]  T.H. Lee,et al.  A 1.5 V, 1.5 GHz CMOS low noise amplifier , 1996, 1996 Symposium on VLSI Circuits. Digest of Technical Papers.

[8]  A 1.8 GHz CMOS quadrature voltage-controlled oscillator (VCO) using the constant-current LC ring oscillator structure , 1998, ISCAS '98. Proceedings of the 1998 IEEE International Symposium on Circuits and Systems (Cat. No.98CH36187).

[9]  T. Lee,et al.  A 1.5 V, 1.5 GHz CMOS low noise amplifier , 1996 .