Measuring Distortion in Switching Ampliefiers
The distortion performance of switching amplifiers (a.k.a. "Class-D" amplifiers) has rapidly improved in recent years. Unfortunately they still exhibit a form of high-frequency non-linearity that is not clearly revealed by traditional THD+N and SMPTE-IMD tests. The Twin-Tone IMD measurement technique provides an excellent way to measure this form of distortion.
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