Hi,
I am currently working on zedboard. I want to implement multiple frequencies at 16 bit output of zedboard on FMC terminals. I have implemented multi-channel technique to achieve 10 frequencies starting from 1MHz upto 19MHz with 2MHz difference using DDS IP core (Clock freq = 384 MHz, from DAC 34H84 board). Each channel has Clock frequency of 384/10 = 38.4MHz. Frequencies appears on output in mixed form (i-e 1MHz to 19MHz ) and then repeating the frequency spectrum at multiple of 38.4MHz upto 384MHz. I applied Low-pass filter with cuttoff at 20MHz to attenuate the frequencies appearing on multiples of 38.4MHz, but result shown only two waves (1MHz and 2MHz). All other frequencies are attenuated.
Can someone suggest me a solution? or send some link where multiple frequencies are generated?
Thanks,
Syed Abuzar