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Altera_Forum's avatar
Altera_Forum
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16 years ago

Interpolation with CIC Filter

Hello! I want to interpolate a 13.5 kHz sinus signal, which is generated with a NCO at a sampling rate of 54 Khz. I want a sampling of 5,4 MHz. So i tried to use a CIC-Filter with rate = 10...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hello!

I tried to connect the "valid in" with the lower clock. When I set the rate to 5 it works fine. But with a higher rate like 10 or 100 I get a 4.5 kHz-Sinus....it's weird.

But I think it is the right way to "clock" the valid in, because in the "functional description" of the CIC-Filter you can see that the "valid in" is clocked too.