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

Young Mi Lee, Ju Sang Lee, Ri A. Ju, Kang Wook Kim, Sang Dae Yu

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


This research describes the design of a fully integrated fractional-N frequency synthesizer for the local oscillator in IMT-2000 system using 0.18-μm 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.

Original languageEnglish
StatePublished - 2002
Event2002 45th Midwest Symposium on Circuits and Systems - Tulsa, OK, United States
Duration: 4 Aug 20027 Aug 2002


Conference2002 45th Midwest Symposium on Circuits and Systems
Country/TerritoryUnited States
CityTulsa, OK


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