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Broadside coupled differential pair, possible in Allegro?

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I am interested in routing differential pairs in a broadside coupled configuration, see [here](https://www.allaboutcircuits.com/tools/broadside-coupled-stripline-impedance-calculator/). Is this possible with Allegro? 

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  • steve
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    Yes but you have to start and finish the route in single trace mode. Start routing the diff pair then right click - Single trace mode and route one to a start point on one layer, Repeat for the other half until they are coicident, then change the mode to not use Single Trace mode and they will route together, repeat for the other end. It doesn't to report any DRC's for uncoupled length and phase on my example but that may depend on the stackup thickness and rule values defined. 

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