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