Berti
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Hi, I can't tell you the optimal solution, but according to my experience:
- don't use electrolytic capacitors since those might produce current-spike noise - tantalum capacitors are more expensive but don't show current-spike noise. But ESL and ESR are usually higher than in ceramic capacitors. Therefore you probably should include(model) ESL/ESR into your loop filter. - Cermic capacitors are better suited for high frequencies because they are not constructed as a coil. However, usually they are not very linear (distortion), but for a PLL loop filter I don't think that this is a issue.
Parallel capacitors always work, but that needs space...
I hope this helps.
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