We want to evaluate the usefulness of a software tool for calculating differential pairs, and estimating stack up requirements for multi layer boards... Primarily to estimate the correct line width and spacing required in any given design stack up or material combination. Can any of you recommend a tool to do this sort of job that you find useful? I'd like to look at low, med and high end tools and characterize them based on price vs. performance and/or capabilities. Best regards, Bill Brooks - KG6VVP PCB Design Engineer, C.I.D.+, C.I.I. 3030 Enterprise Court, Vista, CA 92083 http://www.dtwc.com <http://www.dtwc.com> Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] _______________________________________ Member of the San Diego Chapter of the IPC Designers Council Communications Officer, Web Manager http://dcchapters.ipc.org/SanDiego/ <http://dcchapters.ipc.org/SanDiego/> http://pcbwizards.com <http://pcbwizards.com> --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------