A design of the frequency synthesizer for UWB application in 0.13 μm RF CMOS process

This paper describes a 3 to 5GHz frequency synthesizer for MB-OFDM (multi-band OFDM) UWB (Ultra-Wideband) application using 0.13um CMOS process. The frequency synthesizer operates in the band group1 whose center frequencies are 3432MHz, 3960MHz, and 4488MHz. 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 75mW from a 1.5V supply. The VCO tuning range is 500MHz. The simulated phase noise of the VCO is -110dBc/Hz at 1MHz offset. The die area is 3 × 2mm
²
.