A Design of 0.12ppm/Step Digitally Controlled Crystal Oscillator for PHS Application in 0.25μm CMOS Process

DongHyun Ko; Young-Gun Pu; Sangwoo Kim; Joon-Sung Park; Byung-Hak Cho; Kang-Yoon Lee

Summary

International Technical Conference on Circuits/Systems, Computers and Communications

2008

Session Number:P2

Session:

Number:P2-18

A Design of 0.12ppm/Step Digitally Controlled Crystal Oscillator for PHS Application in 0.25μm CMOS Process

DongHyun Ko, Young-Gun Pu, Sangwoo Kim, Joon-Sung Park, Byung-Hak Cho, Kang-Yoon Lee,

pp.-

Publication Date:2008/7/7

Online ISSN:2188-5079

DOI:10.34385/proc.39.P2-18

PDF download (301.2KB)

Summary:

This paper presents a integrated Digitally Controlled Crystal Oscillator (DCXO) for PHS application. The frequency tuning is done by two-step MIM capacitor tuning scheme. The coarse tuning covers the frequency range of +-24ppm of the nominal frequency with the resolution of 0.75ppm. On the other hand, the fine tuning covers the frequency range of +-15ppm of the nominal frequency with the resolution of 0.12ppm. This chip is fabricated with 0.25um CMOS technology, and the die area is 0.43mm x 0.55mm including PADs.