John, As Chairman of the committee responsible for this document, I feel a certain "ownership" to this problem. At our last meeting in Naples, the committee members identified various formulae with either printing errors (subscript or superscript) or outright errors. It's difficult to trace how the outright errors occur, especially after the fact. Now that you know all this, I've taken to looking through some references here and none have "embedded microstrip". I can find only microstrip or stripline or generic notations. If you'd like copies of what I have, please email me individually or call. In the meantime, I'll keep looking! Happy Holidays to all the `Net community!!! Regards, Tom ====================================================================== Tom Bresnan Product Engineering Manager 714.951.3388 MULTEK 714.951.8794 FAX 16 Hammond [log in to unmask] Irvine, CA 92718 USA http://www.multek.com ====================================================================== _/ _/ _/ _/ _/ _/_/_/_/_/ _/_/_/_/ _/ _/ _/ _/ _/_/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/_/_/ _/_/_/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/ _/_/_/_/ _/_/_/_/ _/ _/_/_/_/ _/ _/ ______________________________ Reply Separator _________________________________ Subject: DES: Embedded Microstrip IPC-D-317A Author: [log in to unmask] at INTERNET_GATEWAY Date: 12/18/96 10:05 AM REF IPC-D-317A: In section 5.5.2.1, there appears to be an error in the theoretical calculated capacitance. If I use nominal values for equation (5.35): DK = 4.5 H = 0.020 T = 0.0012 I try to take a ln of a negative number. Can someone enlighten me as to what the correct equation should be? TIA, John R. Kretsch, P.E. Sr. Engineer, Design Assurance ADC Broadband Communications [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * *************************************************************************** *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * *************************************************************************** * If you are having a problem with the IPC TechNet forum please contact * * Dmitriy Sklyar at 847-509-9700 ext. 311 or email at [log in to unmask] * ***************************************************************************