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Altera_Forum's avatar
Altera_Forum
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14 years ago

PLL output square wave distorted

I am testing PLL output from an old Stratix board. The PLL has an onboard 80MHz crystal as input clock. However at > 60 MHz, the PLL output is not as square as I wish with ripple and 50mv u...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

My scope is tek TDS5034B, sampling rate is 5G/s.

My stratix board have an SMA connector for PLL output, from which I use a SMA-BNC adaptor + BNC cable to the scope. all cable and connector should have a bandwidth well beyond 2GHz.

Anybody have monitored your PLL output at high frequency?