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A Simple Phase Interpolator based Spread Spectrum Clock Generator Technique  

Lee, Kyoung-Rok (School of Electronics and Electrical Engineering, Hongik University)
You, Jae-Hee (School of Electronics and Electrical Engineering, Hongik University)
Kim, Jong-Sun (School of Electronics and Electrical Engineering, Hongik University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.47, no.10, 2010 , pp. 7-13 More about this Journal
Abstract
A compact phase interpolator (PI) based spread spectrum clock generator (SSCG) for electromagnetic interference (EMI) reduction is presented. The proposed SSCG utilizes a digitally controlled phase interpolation technique to achieve triangular frequency modulation with less design complexity and small power and area overhead. The novel SSCG can generate the system clock with a programmable center-spread spectrum range of up to +/- 2 % at 200 MHz, while maintaining the clock duty cycle ratio without distortions. The PI-based SSCG has been designed and evaluated in 0.18-um 1.8-V CMOS technology, which consumes about 5.0 mW at 200MHz and occupies a chip size of $0.092mm^2$ including a DLL.
Keywords
Spread spectrum clock; SSCG; Frequency modulation; phase interpolator; EMI;
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