Total Harmonic Distortion Measurements
Total harmonic distortion (THD), generally defined as the ratio of the RMS sum of the amplitudes of harmonic signals of a desired fundamental to the RMS sum with the fundamental included, is a popular measure of the nonlinearity of a device. Often, it is desired to evaluate this quantity over a sweep of (fundamental) frequency or power, and as such it can sometimes be complicated to set up since many measurements are needed. In the MS464xB series VectorStar VNAs, multiple source control (Option 7), coupled with the standard equation editor, can give one considerable flexibility in defining this measurement while providing a relatively simple way to orchestrate all of the needed acquisitions. This paper will look at some of the variations on defining THD and some different ways that the MS464xB can be configured to make them. We will begin with some definitions, cover two-port DUT measurements, and then explore variations with differential DUTs.
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