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Why is the Frequency Modulation Profile important?

April 26, 2017Frequency modulation profile

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Why is the Frequency Modulation Profile important?

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Since the frequency modulation width is fixed and independent of the frequency modulation profile, the total radiated EMI is spread over the frequency modulation width. The goal of a spread spectrum oscillator is to spread the EMI energy evenly over the frequency modulation width, so as to eliminate any peaks or troughs.

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Since the frequency modulation width is fixed and independent of the frequency modulation profile, the total radiated EMI is spread over the frequency modulation width. The goal of a spread spectrum oscillator is to spread the EMI energy evenly over the frequency modulation width, so as to eliminate any peaks or troughs. Using a sinwave or triangular profile can result in increases in peak EMI emissions. Using an optimized modulation profile evenly distributes this EMI energy over the frequency modulation width.