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Altera_Forum
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16 years ago

PLL megacore probs.build my own??

Hi all, I want to implement a PLL that will lock onto & track an incoming signal of about 30KHz and output a multiple of that locked frequency. I tried using Quartus's PLL megacore function but...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi guys! Happy New Year!

I got a working PLL and managed to modify it to do what I want it to do..well almost.

Does anyone know how to cause a clock to have a 50% duty cycle?? The NCO's output clock (I hardlimit the output sine wave to get a clock) seems to have glitches with its duty cycle : every so often the duty cycle is less/more than 50%. This eventually accumulates and my clock drifts.