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Altera_Forum
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14 years ago

Gate level Simulation passes but design fails on target borad

Hello, I am implementing a filter (2nd order) in Quartus Stratix II device running at 500KHz. I simulated the design using ModelSim. My Target hardware consists of stratix II device. Input...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi,

I hope you realise that changing Fs for a given filter will change the response proportionally.

If your filter is fixed for a response at Fs of 500Ksps to produce a notch at 100Hz, then that notch point will move to 100 *125/500 = 25Hz if Fs is made 125Ksps.

How do you know your input is at a given freq. If you generate from LUT then the freq will depend on Fs at LUT