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Honored Contributor

13 years ago

undesired sidebands on Cyclone IV E PLL output

I am using a PLL in a Cyclone IV E. I have a 20 MHz oscillator connected to a clock-input pin. I am trying to get 200 MHz as the output. For the design, I am using only an ALTPLL megafunction bloc...

Altera_Forum

Honored Contributor

13 years ago

Nevermind, problem solved. The issue was due to a faulty VCCA regulator that had 22 KHz oscillations on its output.

Lesson learned: a sloppy VCCA equals sloppy PLL outputs.

Forum Discussion

undesired sidebands on Cyclone IV E PLL output

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