And one more note. On Apr 11, 2011, at 9:09 AM, Andy Fierman wrote:
> The capacitance vs. voltage of the X7R dielectric is not very good. > NP0/COG are usually specified for precision timing and filter > applications. > > NP0/COG also have a much lower temperature coefficient. NPO/C0G is a temperature coefficient spec. Usually, a low temperature coefficient ceramic will also have low dielectric hysteresis. However, I have encountered exceptions. It's preferable to use capacitors where the manufacturer's data sheet gives a limit on hysteresis. A common spec for a "good" capacitor is <0.1% hysteresis. John Doty Noqsi Aerospace, Ltd. http://www.noqsi.com/ j...@noqsi.com _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
