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
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