Temperature affects output frequency

Question

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 and decreases by heating the chip. The temperature range I tested was in the field of +60°C to +10°C. Is the PLL affected by temperature that much?

Has anyone an idea what the problem could be?

Greets,

cappuMUC

altera_forum · Answer

Do You use feedback for PLL clock?

altera_forum · Answer

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

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Temperature affects output frequency

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