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Altera_Forum's avatar
Altera_Forum
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15 years ago

DEo NANO VCC noise

hi i have a de0 nano and in the gpio headers i am doing pwm at 50MHZ...it have 2 gpio headers of 40 pins .. and i notice that when they are the same ... in the VCC_SYS appear a noise almost 2 Vpp... ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I don't think, that the problem is generated by insufficient bypassing on the DE0-Nano board. It's most likely in your external circuit and the way how you connect the circuit to the board and how you measure waveforms. In other words, it's about the basics of digital logic design.

Without knowing the exact setup, e.g. cabling, external circuit layout, probe connection, it's difficult to understand the problem details or to give reasonable suggestions.