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Altera_Forum
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13 years ago

Cyclone III PLL loses lock at >75C

I am using PLL reconfiguration. When the FPGA is powered up the PLL is loaded with different M, N and C values for the frequency I want to generate. The PLL will lock below 75C but once it gets t...
Altera_Forum's avatar
Altera_Forum
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13 years ago

75C measured using thermocouple on the part.

Input clk is oscillator quality is good, voltage regulator is OK, switching noise is hard to eliminate, I have reduced outputs to minimum current.

Those were my thoughts too, thanks for the replies.