Spread-spectrum oscillators reduce spectral EMI emissions, allowing products to pass FCC and other regulatory tests. They "dither" the clock frequency in a narrow range around the desired clock rate. This produces a wider spectrum with spectral lines which have lower energy per hertz, as compared to a conventional single tone. Learn more...
Spread-spectrum oscillators attempt to reduce the spectral EMI emissions from circuits and systems. A clock signal usually provides a single tone spectrum, which can interfere with other systems' inputs, and thus can fail FCC EMI emissions tests. "Dithering" the clock frequency about some narrow range around the desired clock rate produces a wider spectrum with spectral lines which have lower energy per hertz than the single tone.
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|Application Note||1995||Using Spread Spectrum Oscillators to Reduce Radiated Emissions in Consumer Products|
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