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Altera_Forum's avatar
Altera_Forum
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10 years ago

Signal distortion ADC/DAC on Cyclone III dev kit

Hi All, I'm new to FPGA's, and have been having difficulty doing basic signal I/O. I modified the factory example that came with the Cyclone III software (see attachment for block diagrams)....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

It would be useful if you posted images of the ADC output (captured using a scope) and the DAC data plotted using say MATLAB's stair() function (so that it looks like sampled data).

Can you post a link to the specific board(s) you are using, so that we can see what ADC/DAC is used.

What frequency are you trying to generate? Many ADC/DAC kits have balun/transformer inputs/outputs which limit the range of frequencies you can test with.

There are some FPGA signal processing resources on this page you might like to read;

https://www.ovro.caltech.edu/~dwh/correlator/cobra_docs.html

Take a look at the EELive! slides and the ESC 2013 paper, slides, and code.

Cheers,

Dave