Thank you, Brad, Gisbert and John for you info regarding this issue - Black Magic; as many designer call it. I certainly follow up your suggestions to try and get the best possible results - After - it's up to "Black Magic". But, I guess - once you have a satisfied calculation, things can't go wrong too bad - I hope. Thanks again to you Robi
At 02:33 16.02.07, you wrote: >Robi, > I second the comments about the limited Polar calculator. > The limited version with the time licenses is easy to use, setup, > purchase licenses and you only pay for what you use. A lot of the > better fab shops use the Polar calculators. It is the only > reasonably priced solution available without purchasing a full > field solver program for big bucks. > > If you purchase the one hour license and are careful about > organizing your materials before starting the program and shutting > down the program immediately after doing calculations, you can do a > lot of calculations over the approx. 36 hours until the license > actually expires. > >Sincerely, >Brad Velander >Senior PCB Designer >Northern Airborne Technology >#14 - 1925 Kirschner Road, >Kelowna, BC, V1Y 4N7. >tel (250) 763-2232 ext. 225 >fax (250) 762-3374 > > >-----Original Message----- >From: John M. Cardone [mailto:[EMAIL PROTECTED] >Sent: Thursday, February 15, 2007 7:54 AM >To: Protel EDA Discussion List >Subject: Re: [PEDA] "differential pair" routing on CS layer > > > robi, >I do a bit of controlled impedance work in printed flex cabling and I've >found the Polar calculator to be very accurate. We've realized flex >cables within 5% of predicted at 110 ohm. Your fabricator may have a >calculator and know their processes, which also have an effect. It's >quite expensive, but is available over FlexLM for about $20 US/hour . >All impedance calculators are approximations and you will get the best >calculator results with edge coupled as opposed to broadside coupled. >John > > >____________________________________________________________ >You are subscribed to the PEDA discussion forum > >To Post messages: >mailto:[email protected] > >Unsubscribe and Other Options: >http://techservinc.com/mailman/listinfo/peda_techservinc.com > >Browse or Search Old Archives (2001-2004): >http://www.mail-archive.com/[email protected] > >Browse or Search Current Archives (2004-Current): >http://www.mail-archive.com/[email protected] ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
