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

Author

Lee, Young-Mi ; Lee, Ju-Sang ; Ju, Ri-A ; Kim, Kang Wook ; Yu, Sang-Doe

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Kyungpook Nat. Univ., Daegu, South Korea

Volume

3

fYear

2002

fDate

4-7 Aug. 2002

Abstract

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.

Keywords

3G mobile communication; CMOS integrated circuits; UHF integrated circuits; channel spacing; code division multiple access; frequency synthesizers; low-power electronics; 0.18 micron; 1.584 to 2.4 GHz; 1.8 V; 28 mW; CMOS process; ECL D-flip-flop; IMT-2000 system; LC-tuned VCO; WCDMA; active cascode transistor; channel spacing; charge pump; diode-connected transistor; local oscillator; low-power fully-integrated fractional-N frequency synthesizer; multi-modulus prescaler; output power; passive loop filter; phase-frequency detector; portable wireless communication; sigma-delta modulator; CMOS process; CMOS technology; Charge pumps; Flip-flops; Frequency synthesizers; Impedance; Local oscillators; Multiaccess communication; Phase frequency detector; Power supplies;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2002. MWSCAS-2002. The 2002 45th Midwest Symposium on

Print_ISBN

0-7803-7523-8

Type

conf

DOI

10.1109/MWSCAS.2002.1187114

Filename

1187114