How can I measure track lengths for differential pairs?

Question

Hi,

I've been using Eagle for a number of years now for a variety of circuits. I'm going to start on a couple of designs that need differential pairs. I understand the stackup and impedance calculations, how can I get Eagle to report the track net lengths so I can match pair lengths?

Currently use Eagle 5.11, might be tempted to upgrade if V6.x supports better analysis tools

Ian

anweid · Accepted Answer

Am 24.02.2014 23:32, schrieb istedman: Currently use Eagle 5.11, might be tempted to upgrade if V6.x supports better analysis tools EAGLE 6 has direct support for routing differential pairs and can automatically do the meandering for you. Unfortunately, the method is not very intuitive, but it should work once you read the manual. Since I haven't used the differential tool earnestly (but just testwise), I'm not sure about its quality, but at least it's there, and you can test it by just downloading version 6 for free, checking the manual for 'differential pair' and 'meander' and trying yourself. Andreas Weidner

AnalogNotes · Answer

Go to: http://www.cadsoftusa.com/downloads/ulps and type "length" into the search box. There are a couple ULPs you can try... EDIT: That is, if the standard "length.ulp" doesn't do what you want...