Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
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

i think there is a problem with your CIC hardware, because input samples should be synchronized with c0 clock and output samples should be synchronized with c1 clock. Note this, for every input sample 100 samples must go out.

In your hardware, an input sample (synchronized with c0) is read 100 times by a module clocked with c1.

As you are using two clocks, in your CIC hardware a dual-clock FIFO for crossing clock domains must be included.