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Altera_Forum
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17 years ago

Cyclone 3, no output for high freq. signals?

Hi there, I have a design that sends two LVDS signals (one data, one clock) off a cyclone 3 device. When the signal frequency was 250MHz or below, I can see those signals with a scope. But when...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
17 years ago

Hi Brad,

Thank you for your reply. Actually I was changing it from the PLL.... But I think I know why now. The high frequency signal got attenuated too much at the frequency of 276 MHz. I guess with better impedance matching the problem may be gone.

Thanks again.

Hua