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DTV 튜너 응용을 위한 광대역 저잡음 CMOS VCO 설계
김용정(Y. J. Kim),유지봉(J. B. Yu),고승오(S. O. Ko),김경환(K. H. Kim),유종근(C. G. Yu) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
Since the digital TV signal band is very wide (54~806㎒), the VCO used in the frequency synthesizer must also have a wide frequency tuning range. Multiple LC VCOs have been used to cover such wide frequency band. However, the chip area increases due to the increased number of integrated inductors. In this paper, a scheme is proposed to cover the full band using only one VCO. The RF VCO block designed using a 0.18㎛ CMOS process consists of a wideband LC VCO, five divide-by-2 circuits and several buffers. The simulation results show that the designed circuit has a phase noise at 10㎑ better than -87㏈c/㎐ throughout the signal band and consumes 10㎃ from a 1.8V supply.