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Altera_Forum
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14 years ago

Unwanted frequency shift in DA-converted signal

Hi, i use Matlab/Simulink and DSP Builder for my project. In Matlab, I generate a digital source signal and program it in a LUT-Block in Simulink. This Block then sends the data to my DACs...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

It might not be the issue of continuity, it is just a matter of exclusion.

You may try generate the three frequencies then add them up in hardware rather than pre-added in LUT.

I agree phase discontinuity will show as spikes rather than offset.

The offset may be explained on basis of clock, heating, timing or bug.