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Are Class D amplifiers a potential EMI source?

April 26, 2017amplifiers class EMI potential source

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Are Class D amplifiers a potential EMI source?

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EMI (electro-magnetic interference) is caused by rapid changes in voltages and currents. When the power stage makes a transition, the switch outputs change across the entire power supply voltage and the entire loudspeaker current is re-routed through the output stage. This is the root cause of EMI in class-D amplifiers. It can be satisfactorily addressed by relaxing switching speeds (if distortion is controlled by feedback), and meticulously planning the board layout.