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Altera_Forum's avatar
Altera_Forum
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13 years ago

Temperature affects output frequency

Hi all, I have a problem with a Cyclone III FPGA. I generate a frequency around 40MHz by PLL but the frequency drifts +/- 500kHz depending on the FPGAs temperature. The frequency rises by cooling ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

What is the clock source that feeds the PLL? Are you sure it's not the source that's drifting?