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This paper describes a 3 to 5 GHz frequency synthesizer for MB-OFDM (multi-band OFDM) UWB (Ultra- Wideband) application using 0.13 um CMOS process. The frequency synthesizer operates in the band group 1 whose center frequencies are 3432 MHz, 3960 MHz, and 4488 MHz. To cover the overall frequencies of group 1, an efficient frequency planning minimizing a number of blocks and the power consumption are proposed. And, a high-frequency VCO and prescaler architecture are also presented in this paper. A new coarse tuning scheme that utilizes the MIM capacitance and the varactor is proposed to expand the VCO tuning range. The single PLL and two SSB-mixers consume 75 mW from a 1.5 V supply. The VCO tuning range is 500 MHz. The simulated phase noise of the VCO is -110 dBc/Hz at 1 MHz offset. The die area is 3 times 2 mm2.