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A 3–10 GHz, 14 Bands CMOS Frequency Synthesizer With Spurs Reduction for MB-OFDM UWB System

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2 Author(s)
Tai-You Lu ; Dept. of Electron. Eng., Nat. Chiao-Tung Univ., Hsinchu, Taiwan ; Wei-Zen Chen

This paper presents the design of a 14 bands CMOS frequency synthesizer with spurs reduction for MB-OFDM UWB system. Based on a single phase-locked loop and two-stage frequency mixing architecture, it alleviates harmonics mixing and frequency pulling to diminish spurs generation. Also, only divide-by-2 dividers are needed in the feedback path of the PLL. Thus more precise I/Q sub-harmonics can be derived for the SSB mixer in the 14 bands carrier generation. The image spurs are suppressed below -45 dBc and improved by more than 22 dB incorporating with I/Q calibration. Implemented in a 0.18-μm CMOS technology, this chip drains 65 mA from a single 1.8 V supply. The chip size is 2.5 by 2.2 mm2 providing 14 bands I/Q phases.

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Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:20 ,  Issue: 5 )