Title :
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
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;
Conference_Titel :
VLSI Circuits, 1999. Digest of Technical Papers. 1999 Symposium on
Conference_Location :
Kyoto, Japan
Print_ISBN :
4-930813-95-6
DOI :
10.1109/VLSIC.1999.797257
