A fractional-N frequency synthesizer for WCDMA/Bluetooth/ZigBee applications  

作　　者：周春元 李国林 张春 池保勇 李冬梅 王志华 

机构地区：[1]Institute of Microelectronics Tsinghua University [2]Department of Electronic Engineering, Tsinghua University

出　　处：《Journal of Semiconductors》2009年第7期114-118,共5页半导体学报（英文版）

基　　金：supported by the Beijing Municipal Science & Technology Development Program(No.D0305003040111);the National Natural Science Foundation of China (No. 90407006)

摘　　要：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-80 dBc/Hz in band and-115 dBc/Hz @ 1 MHz for the three modes, and only draws 21 mA from a 1.8 V supply.It has a high hardware sharing and a small size, only 1.5 × 1.4 mm2.The system architecture, circuit design, and measured results are also presented.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-80 dBc/Hz in band and-115 dBc/Hz @ 1 MHz for the three modes, and only draws 21 mA from a 1.8 V supply.It has a high hardware sharing and a small size, only 1.5 × 1.4 mm2.The system architecture, circuit design, and measured results are also presented.

关 键 词：MULTI-STANDARD PLL frequency synthesizers VCO 

分 类 号：TN929.5[电子电信—通信与信息系统]