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Hello dears,
I'll use altera's fft megafunction, and there are several question need you help:
1. The input data coming from ADC's sampling values, the sample speed is 25Mhz. However, my system clock speed is 100MHz. How to set my fft's clock speed? 25MHz or 100Mhz? Could different clock speed for fft will affect the transform result?
2. What data should be fed into sink_imag port of FFT core? i found someone connected this port to GND directly, is it right? why?
thanks in advance!
Jerry
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you do fft on your signal and not on system clock so fft has to be enabled 1:4 of system clock starting with first sample
if you don't have imaginary part of input then set it to zero
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