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Tapered Trace function not working

FrancisFogarty

Hi Guys,

im using cadence allegro 16.5 version. and for some reason the tapered trace function wont work on a selected cline?

i have attached an image with this of the issue and you can see why i wish to taper. the function says it has finished but the cline stays the same.

i know that there is a desired angle and tapered trace options in the settings for tapered traces but im not sure how this works? would anyone know the optimal settings to get this to work?

all help is welcome.Thanks

Regards

Fran  

  • ScottCad

    Fran the tapered trace function works on two clines of different widths only. No DRC must exist on the net for it to work.

    Try this as a test. Draw a trace with a width of 50 mil for about an inch in length then reduce the trace width down to say 25 mils and continue on routing for about an inch.

    Go to the gloss menu "Route > Gloss > Fillet Parameters.

    Check the option at the bottom of the window "Tapered Traces" I set a desired angle of 60 and a offset of 200, click ok to dismiss the dialog.

    Go back to the route gloss menu and select add a tapered trace. in the find menu make sure cline is checked. Draw a box with your cursor around the point where the 50 mil trace intersects with the 25 mil trace and a little fillet will be put in to taper the trace.

    Hope that helps,

    Quick edit here, Fran in your picture I am not sure if that is a pin that the trace is connected to or not. If it is a pin then you dont need to use the tapered trace option. Just use a fillet instead. Come off the pin with a trace of a suitable size and then gloss it with a fillet. 

    Scott.

  • lichao

    I am not very clear, maybe you can come here to have a look.

    http://pcb.hqew.net/

  • FrancisFogarty

    Hi Scott,

    yes this is a pin. could you elaborate a bit on how to use the fillet function i have ever used it before. Thanks for the help.

     Regards

    Fran  

  • FrancisFogarty

    Hi Scott,

    i tried using the add fillet but it only trys to correct the point of entry between pad/pin and cline.

    but the extra etch over the pad as indicated by the arrow is the problem. i need this to taper like the pad but it wont work and i dont know what my options are. thanks

    regards

    Fran  

  • FrancisFogarty
    just to be clear i removed the DRC error like you suggested prior to using tapered function.
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