Ground noise when switching output

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.

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?

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