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Spread-Spectrum Modulation
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By flattening the wideband spectral components using Maxim's spread-spectrum modulation technology, EMI emissions that may be radiated by the speaker and cables are reduced. Note the lower peaks and wider spectral components in Figure 1 as compared to the peaks and spectral components of the conventional PWM Class D architecture shown in Figure 2.
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| The dramatic decrease in energy at the fundamental frequency and its harmonics is achieved by dithering the Class D switching frequency to spread its energy across a wider spectrum. Application Note 3881 (Spread-Spectrum-Modulation Mode Minimizes Electronmagnetic Interference in Class D Amps) provides a detailed discussion of this technique. |
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