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Karunakaran's avatar
Karunakaran
Icon for New Contributor rankNew Contributor
4 years ago

Ground noise when switching output

HI

When am switching any output Ground is bouncing 400mV 3 to 4 rings... is there any guidelines to reduce this

4 Replies

  • Ash_R_Intel's avatar
    Ash_R_Intel
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    Hi,


    Please let us know which FPGA device you are targeting to.

    You may refer to documents available:

    • AN-731: Simultaneous Switching Noise Guidelines for Intel Cyclone 10 LP, Cyclone IV, and Cyclone III Devices
    • Device design guidelines
    • AN 75: High-Speed Board Designs
    • Pin connection guidelines


    Regards.


  • ak6dn's avatar
    ak6dn
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    How are you measuring that 400mV noise on your ground? What is the test lead setup into the oscilloscope input?

    A less than optimal probing setup can induce false noise into your measurement.

    You must be probing 'ground' with respect to 'ground', correct? But where are these two points located?

  • Ash_R_Intel's avatar
    Ash_R_Intel
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    This thread will be transitioned to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you