27th International AES Conference
 

PAPER SESSION 6: MEASUREMENTS AND TESTS



6-1 Measuring Distortion in Switching Amplifiers


Bruce Hofer. Audio Precision, Inc., Beaverton, OR, USA


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 nonlinearity 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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