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http://dx.doi.org/10.6109/jkiice.2012.16.11.2480

Design of the Voltage Controlled Oscillator for Low Voltage  

Lee, Jong-In (군산대학교 전자공학과)
Jung, Dong-Soo (군산대학교 전자공학과)
Jung, Hak-Kee (군산대학교 전자공학과)
Yoon, Young-Nam (대한상공회의소 인력개발사업단)
Lee, Sang-Young (군산대학교 전자공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.16, no.11, 2012 , pp. 2480-2486 More about this Journal
Abstract
The design of low voltage LC-VCO(LC Voltage Controlled Oscillator) has been presented to optimize the phase noise and power consumption for the block of frequency synthesis to satisfy WCDMA system specification in this paper. The parameters for minimum phase noise has been obtained in the region of design, using the lines of the tuning range and the excess gain in the plane of the inductance and the transconductance of MOS transistor to compensate the loss of LC-tank. As a result of simulation, the phase noise characteristics is -113dBc/Hz for offset of 1MHz. The optimum designed LC-VCO has been fabricated using the process of 0.25um CMOS. As a result of measurement for fabricated chip, the phase noise characteristics is -116dBc/Hz for offset of 1MHz. The power consumption is 15mW, and Kvco is 370MHz/V.
Keywords
WCDMA; VCO; Excess gain; Phase noise;
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