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MB-OFDM UWB 시스템을 위한 주파수 합성기의 유형별 설계 및 비교
이재경(J. K. Lee),정태현(T. H. Cheong),박종태(J. T. Park),유종근(C. G. Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
This paper describes fast-hopping frequency synthesizers for multi-band OFDM(MB-OFDM) ultra-wide band(UWB) systems. Three different structures in generating 3 center frequencies(3432㎒, 3960㎒. 4488㎒) are designed and compared. The first structure generates 3 center frequencies using only one PLL operating at 4224㎒. The second uses three PLLs operating at corresponding center frequencies. The third employes two PLLs operating at 3960㎒ and 528㎒. Simulation results using a 0.18㎛ RF CMOS process parameters show that the third structure exhibit the best characteristics. The band switching time of the proposed synthesizer is less than 1.3㎱ and the spur is less than -36㏈c. The synthesizer consumes 22㎃ from a 1.8V supply.