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Altera_Forum
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10 years ago

How does dither value affect the sine wave output of Altera NCO IP Core

Good day! I tried plotting a sine wave in Microsoft Excel by using the following equation in page 3-1 of NCO IP Core User Guide v14.1: s(nT) = Asin[2π(fO+ fFM)nT+ ϕPM+ ϕDITH)] ...
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Altera_Forum
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10 years ago

Hi kaz, Thanks!

I understand now that ϕDITH in the equation is noise of random value.

What I don't understand is that in Altera NCO IP Core, when Dither Level is adjusted, the time domain graph is not changed but the frequency domain graph is affected. Can somebody explain how this happens?

Thanks!