A 2 V 150 MHz CMOS digital phase modulator for fast-switching frequency synthesis

Author

Wei-Zen Chen ; Jieh-Tsong Wu

Author_Institution

Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

fYear

1999

fDate

17-19 June 1999

Firstpage

121

Lastpage

122

Abstract

A 2 V 145 mW 150 MHz CMOS digital phase modulator is fabricated using a 0.6 /spl mu/m CMOS technology. The modulator is used to control a PLL to form a frequency synthesizer. Fine frequency resolution is achieved by phase interpolation and /spl Delta//spl Sigma/ oversampling. High-speed frequency switching is achieved by loop bandwidth adaptation. Settling time of a PLL with 109 kHz natural frequency can be reduced from 830 /spl mu/s to 94 /spl mu/s.

Keywords

CMOS digital integrated circuits; delta-sigma modulation; frequency synthesizers; interpolation; modulators; phase locked loops; phase modulation; switching circuits; /spl Delta//spl Sigma/ oversampling; 0.6 micron; 109 kHz; 145 mW; 150 MHz; 2 V; 94 mus; CMOS digital phase modulator; PLL control; delta-sigma oversampling; fast-switching frequency synthesis; fine frequency resolution; high-speed frequency switching; loop bandwidth adaptation; phase interpolation; Bandwidth; CMOS technology; Communication switching; Frequency conversion; Frequency synthesizers; Interpolation; Oscillators; Phase locked loops; Phase modulation; Radio frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

VLSI Circuits, 1999. Digest of Technical Papers. 1999 Symposium on

Conference_Location

Kyoto, Japan

Print_ISBN

4-930813-95-6

Type

conf

DOI

10.1109/VLSIC.1999.797257

Filename

797257