DJ - On Mon, Aug 21, 2006 at 12:56:37AM -0400, DJ Delorie wrote: > > 0.1 uF or 1 uF ? Same footprint (0603), the 1uFs are a few cents more > each (er, ~ 40% more cost for 10x the capacitance). > Don't know if the 0.1uFs have some benefits inductance-wise or > ESR-wise, in general.
This is indeed the trick -- it's unusual to get believable parasitic inductance information from capacitor manufacturers. ESR on a ceramic cap is pretty close to zero; all the damping at the LC resonance will come from the parallel resistance provided by your circuit. I found some nice ceramic capacitor inductance curves (representative, not definitive) from AVX. Go to Digi-Key, bring up a page of 0.1 uF ceramic capacitors, and click through to the datasheets. Like I say, some manufacturers are more helpful than others. The actual parts probably don't change much, as long as you stick to the same package size and dielectric type. - Larry _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user