DocumentCode
1310431
Title
Spread spectrum clock generator with hybrid controlled oscillator
Author
Byun, Sangjin
Author_Institution
Electron. Eng., Dongguk Univ., Seoul, South Korea
Volume
45
Issue
23
fYear
2009
fDate
11/1/2009 12:00:00 AM
Firstpage
1146
Lastpage
1147
Abstract
A spread spectrum clock generator (SSCG) with a hybrid controlled oscillator (HCO) is presented. By using the proposed HCO, the modulation ratio of an SSCG can be made insensitive to process, voltage and temperature variations without a SigmaDelta fractional-N phase-locked loop. The simulated modulation ratio sensitivities are as low as - 1.3%/100degC and 7.0%/V for temperature and VDD, respectively. The SSCG IC, designed in a 0.18 m 1P4M CMOS process, operates from 40 to 90 MHz and consumes 5.5 mA from a 1.8 V supply voltage.
Keywords
CMOS integrated circuits; oscillators; phase locked loops; sigma-delta modulation; signal generators; CMOS process; SSCG IC; SigmaDelta fractional-N phase-locked loop; current 5.5 mA; frequency 40 MHz to 90 MHz; hybrid controlled oscillator; modulation ratio; spread spectrum clock generator; voltage 1.8 V;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el.2009.2042
Filename
5325106
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