题目/Title：
                        A Fractional-N Frequency Synthesizer for WCDMA/Bluetooth/ZigBee Applications

作者/Author：周春元,李国林,张春,池保勇,李冬梅,王志华
                        Chunyuan Zhou,Guolin Li,Chun Zhang,Baoyong Chi,Dongmei Li,Zhihua Wang

期刊/Journal：半导体学报 Chinese Journal of Semiconductors

年份/Issue Date：2009.Jul.

卷（期）及页码/Volume（No.）&pages：Vol.30, No.7, pp. 075008-1-5

摘要/Abstract：

A triple-mode Fractional-N frequency synthesizer with a noise-filter voltage controlled oscillator (VCO) for WCDMA/Bluetooth/ZigBee applications has been implemented in 0.18-μm RF-CMOS technology. The proposed synthesizer achieves a good phase noise lower than -80dBc/Hz in band and -115dBc/Hz@1MHz for the three modes, and only draws 21mA from a 1.8V supply. It has a high hardware sharing and a small size, only 1.5mm×1.4mm. The system architecture, circuit design and measured results are presented in this paper.