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

页码：613 / 616

页数：4

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