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Intermittent RF signal of cn0511

Category: Hardware
Product Number: cn0511

Hi Experts:

We design a FPGA motherboard for cn0511, and plan to generates a DC-5GHz RF signal. The configurations of AD9166 we want to adopt are: 

      -- 2*NRZ, 

      -- NCO mode only, DC_TEST_EN = 1,

      -- Integer NCO Mode,

      -- Main NCO Frequency Hopping,

      -- DC TEST Data( 0x14E 0x14F) for amplitude adjustment, which means I_OUTFS is fixed.

The register map we initialized is as follew:

But we found a very strange problem. It seems to be OK with the signal frequency close to 6GHz/2^n(n = 1,2,...), but intermittent with the signal

frequency away from 6GHz/2^n(n = 1,2,...), e.g. OK for 750MHz, 1.5GHz, intermittent for 647MHz, 1.15GHz. The normal situation is as follows

The abnormal situation is shown below

So How can we fix this problem? Any help is appreciated, Thank you!

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  • Hi  , 

    Here are some questions about your setup: 

    1. Have you tried to setup the CN0511 board with a Raspberry Pi 4 on your side? If yes, have you tried to implement your desired changes in your CN0511 + RPI setup, before transferring into your FPGA platform?
    2. Is it possible to ask for a schematic diagram that will view the FPGA's power rail interfaced with the CN0511 board?
    3. Are you using the available Linux driver for the CN0511 in your setup or are you reading/writing in the registers using your own software?

    Can I also ask for a photo of your complete hardware setup as well?

    Thanks and regards,
    Andy

Reply
  • Hi  , 

    Here are some questions about your setup: 

    1. Have you tried to setup the CN0511 board with a Raspberry Pi 4 on your side? If yes, have you tried to implement your desired changes in your CN0511 + RPI setup, before transferring into your FPGA platform?
    2. Is it possible to ask for a schematic diagram that will view the FPGA's power rail interfaced with the CN0511 board?
    3. Are you using the available Linux driver for the CN0511 in your setup or are you reading/writing in the registers using your own software?

    Can I also ask for a photo of your complete hardware setup as well?

    Thanks and regards,
    Andy

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