Re: PLL Noise
Hi, Use a low noice regulator like the MIC5205 from micrel (used by me in a PLL system works perfect, very very low noise) or LM2905. Check the diagrams for optimum capacitors for your frequency range.
In my design I used a switching mode power supply at 260KHz and the power supply is used for the PLL too, I pass the SMPS through the MIC5205 and supply the PLL, loopfilter etc.. I can detect any residue of the 260 KHz on my analyzer at - 120 dbm !!! impressive I think.
Paul.
Added after 2 minutes:
Hi, you can also use a common mode transformer and pass + and - lines through them before you go to the servo !!. capacitors at the beginning and end. I doing wonders.
Paul.