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Multiple Frequencies generation

Shahzad Raza
Prodigy 90 points

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,

Shahzad Raza.

  • 0
    TI__Guru 71526 points

    Hello Shahzad, 

      You did not state what processor you are using.  Please provide this detail.

    Also, I am not clear on what solution you are requesting; are you wanting to only see frequencies 0 - 20MHz and eliminate all those >20MHz?  Perhaps a spectrum analyzer screen capture with notations of what you are trying to achieve would be helpful.  Show what is required and what is to be eliminated, please.

    Thanks,

    ~Leonard 

  • 0
    TI__Guru 71526 points

    Hello Shahzad, 

      Just checking on the status of this issue.  Please advise.  

    Regards, 

    ~Leonard