Questions tagged [thd]

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How to calculate THD using only the first harmonic?

How can I calculate THD using only the first harmonic? How can I implement in C code DFT voltage formula in order to calculate THD?
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1answer
86 views

Accuracy when measuring THD with LT Spice for AB Audio Amp

I've designed and built my own AB class audio amplifier circuit. I designed it to have as low THD as possible, using LT Spice to run my simulations with the .four command, so I created a bunch of ...
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167 views

DAC “aliasing” of harmonics

While reading articles and application notes regarding DACs and their output spectrum, I stumbled across aliasing of higher harmonics to the first Nyquist band. For example, when generating a single ...
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35 views

Relation between THD and spectral leakage or number of samples

So I'm studying data acquisition and on the lab had to perform an experiment involving sampling a sinusoidal signal of frequency 1100 Hz, 70 samples and sampling frequency 22000 Hz. Now I can clearly ...
4
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1answer
109 views

High THD in an Active Power Correction Circuit

I'm asked to design a 30W power factor corrector for "dimmable" LED drivers. Here are the most crucial requirements: THD (ITHD - THD of the line input current) should never exceed 10% PF should be at ...