A 1.8-V frequency synthesizer for WCDMA in 0.18-μm CMOS process

被引：0
|
作者：
Lee, YM [1 ]
Lee, JS [1 ]
Ju, RA [1 ]
Kim, KW [1 ]
Yu, SD [1 ]
机构：
[1] Kyungpook Natl Univ, Sch Elect Engn & Comp Sci, Buk Gu, Taejon, South Korea
来源：
2002 45TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOL III, CONFERENCE PROCEEDINGS | 2002年
关键词：
D O I：
暂无
中图分类号：
TP18 [人工智能理论];
学科分类号：
081104 ; 0812 ; 0835 ; 1405 ;
摘要：
This research describes the design of a fully integrated fractional-N frequency synthesizer for the local oscillator in IMT-2000 system using 0.18-mum CMOS technology and 1.8-V single power supply. The designed fractional-N synthesizer contains following components. Modified charge pump uses active cascode transistors to achieve the high output impedance. A multi-modulus prescaler has modified ECL-like D flip-flop with additional diode-connected transistors for short transient time and high frequency operation. And phase-frequency detector, integrated passive loop filter, LC-tuned VCO having a tuning range from 1.584 to 2.4 GHz at 1.8-V power supply, and higher-order sigma-delta modulator are contained. Finally, designed frequency synthesizer provides 5 MHz channel spacing with -122.6 dBc/Hz at 1 MHz in the WCDMA band and total output power is 28-mW.
引用
收藏
页码：613 / 616
页数：4
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