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

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2 Author(s)
Wei-Zen Chen ; Dept. of Electron. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Jieh-Tsong Wu

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.

Published in:

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

Date of Conference:

17-19 June 1999