Doug Brooks wrote: > >3. Along the way, the results from the calculator provided the evidence >(unexpected at the time) that moderate ESR is better than low ESR. The >reason is that while low ESRs give you very deep zeros, they also lead to >very high peaks. Moderate ESR gives you an OVERALL better frequency response. > One other factor: If you use low ESR decoupling caps, you also need to use low inductance mounting techniques. If not, the peaks that Doug just mentioned will indeed be very large. Low ESR decaps can allow you to use less total parts, but if you can't mount these parts with very low inductance pads and escapes you may be better off using somewhat more moderate ESR parts. Low ESR parts can be very effective IF utilized properly, or very problematic if not utilized properly. Caveat Emptor...... Ray Anderson Sun Microsystems Inc. ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu