|
||||||||||||||||
|
||||||||||||||||
|
||||||||||||||||
PIERS Online
Vol. 3
No. 7
2007
pp: 971-975A Low-Power Quadrature VCO Using Current-Reused Technique and Back-Gate CouplingYu-Ching Tsai, Yi-Shing Shen, and Christina F. Jou doi:10.2529/PIERS060907041642 Downloads: 2155 Abstract:A novel quadrature voltage controlled oscillator (QVCO) using current-reused technique and back-gate coupling is presented. The QVCO realized with LC-tank is demonstrated in a 0.18 um RF CMOS 1P6M process. Using the current-reused technique efficiently reduces the power dissipation. However, by stacking switching transistors in series like a cascade, the architecture cannot perform well in phase noise. Through an improved circuit schematic with back-gate coupling, the phase noise of the circuit can be lowered. As a result of reducing four transistors in the circuit, the total power dissipation can be cut down even more. The simulation shows the phase noise is around -10 dBc/Hz at 1 MHz offset and the output frequency tuning range of the fabricated QVCO is 600 kHz ranging from 5.15 to 5.75 GHz for 802.11a. The circuit draws only 1.5 mA from a 1.8-V supply. Compared with the recent works, the proposed topologies show a better phase noise performance and can be adopted for low-power applications.References:1. Vancorenland, P. and M. Steyaert, "A 1.57 GHz fully integrated very low phase noise quadrature VCO," 2001 Symposium on VLSI Circuits, Digest of Technical Paper, 111-114, 2001. 2. Razavi, B., "A 1.8VGHz CMOS voltage-controlled oscillator," IEEE Int. Solid-state Circuit Conf. (ISSC) Dig. Tech. Papers, 388-389, San Francisco, CA, Feb., 1997. 3. Crols, J. and M. Styaert, "A fully integrated 900MHz CMOS double quadrature downcon verter," IEEE Int. Solid-state Circuit Conf. Dig. Tech. Papers, 136-137, San Francisco, CA, Feb., 1995. 4. Gierkink, S. L. J., S. Levantino, and R. C. Frye, "A low-phase-noise 5-GHz CMOS quadrature VCO using superharmonic coupling," IEEE Journal of Solid-state Circuits, Vol. 38, No. 7, July, 2003. 5. Rofougaran, A., J. Rael, M. Rofougaran, and A. Abidi, "A 900MHz CMOS LC-oscillator with quadrature outputs," IEEE JSSCC Dig. Tech. Papers, 392-393, February, 1996. 6. Andreani, P., "A low-phase-noise, low-phase-error 1.8 GHz quadrature CMOS VCO," IEEE JSSCC Dig. Tech. Papers, 290-291, February, 1996. 7. Oh, N.-J. and S.-G. Lee, "Current reused LC VCOs," IEEE Microwave and Wireless Component Letters, Vol. 15, No. 11, November, 2005. 8. Kim, H.-R., C.-Y. Cha, S.-M. Oh, M.-S. Yang, and S.-G. Lee, "A very low-power quadrature with back-gate coupling," IEEE Journal of Solid-state Circuit, Vol. 39, No. 6, June, 2004. 9. Shin, H., Z. Xu, and M. F. Chang, "A1.8-V 6/9-GHz switchable dual-band quadrature LC VCO in SiGe BiCMOS technology," IEEE Radio Frequency Integrated Circuits Symposium, DOI:10.1109/RFIC.2002.1011513, 71-74, June 2-4, 2002. 10. Li, S., I. Kipnis, and M. Ismail, "A 10-GHz CMOS quadrature LC-VCO for multirate optical applications," IEEE Journal of Solid-State Circuits, 1626-1634, October, 2003. 11. Kinget, P., Integrated GHz Voltage Controlled Oscillator, 353-381, Kluwer, Norwell, MA, 1999. |
||||||||||||||||
| © Copyright 2008 PIERS. All Rights Reserved. | ||||||||||||||||
