Reducing noise in embedded systems by clock signal spectrum spreading

Clock modulation has the role of reducing electromagnetic interference (EMI) by spreading the spectrum of the clock signal. This method is implemented in the Fujitsu 16 bit and 32 bit microcontrollers. Experiments were conducted on the MB91F362GA microcontroller, with the modulated clock extracted on a special pin and the emitted signals measured with a spectrum analyzer.

[1]  Doyoon Kim,et al.  Spread spectrum clock generator for reducing Electro-Magnetic Interference (EMI) noise in LCD driver IC , 2007, 2007 50th Midwest Symposium on Circuits and Systems.

[2]  D. Kasilingam,et al.  A novel chirp modulation spread spectrum technique for multiple access , 2002, IEEE Seventh International Symposium on Spread Spectrum Techniques and Applications,.

[3]  Chauchin Su,et al.  A spread spectrum clock generator for SATA-II , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[4]  Jonghoon J. Kim,et al.  Dithered timing spread spectrum clock generation for reduction of electromagnetic radiated emission from high-speed digital system , 2002, 2002 IEEE International Symposium on Electromagnetic Compatibility.