关键词: 扩展频谱时钟, 电磁干扰, 电磁兼容

Abstract: The Spread-Spectrum-Clock Generation（SSCG） technique is the latest technology to decrease electromagnetic radiation of the electronic system.In recent years，internationally it has been successfully used on computer peripherals and the electronic equipment which take the microprocessor as the core.This paper uses programmable SSCG chip made by MAXIM Corporation to replace the main clock in PCI-expansion equipment of the computer，and comparative test confirms that SSCG can decrease the electromagnetic radiation in the source by using experiment’s method.

Key words: Spread-Spectrum-Clock Generation（SSCG）, Electro Magnetic Interference（EMI）, Electro Magnetic Compatibility（EMC）