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Altera_Forum's avatar
Altera_Forum
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13 years ago

FFT Frequency Range

I am using the 50MHz internal clock of the Stratix III to collect samples of a chirp signal operating at 30kHz to 80kHz. I read in one of the forums that the FFT MegaCore output frequencies are 0~Fs...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Thanks for the quick reply! I'll try sampling around 200kHz and see if that does the trick. By the way, if I want to look at the FFT results in SignalTap, how do I change the SignalTap clock to match the clock of the ADC and FFT? I can't seem to apply my PLL block to SignalTap since it doesn't appear as a choice in the Signal Compiler block under the SignalTap II tab. Since the slowest internal clock of the FPGA is 50MHz (which would be my base clock), how do you suggest I apply a slower clock to SignalTap?

Thanks again,

Cory