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Creating Guard Rings

Beques
I am working an example learning how to do PCB design using Allegro PCB editor from the OrCAD 16.6 suite, and I'm having a problem where, when I try to put a guard ring around a through-hole pin, it erases the trace when I place the last point of the arc.  It won't let me place a complete circle.  Is there something I'm doing wrong?

I've placed a via from ground to the top routing layer, a straight trace that goes above my pin, then as I place the arcs around the pin, it will not let me complete the circle.  If I click to place the last point of the arc, it erases the whole thing and has me start over again.
  • redwire

     Make sure "Replace Etch" is unselected.  This can be found in the "Options" tab when routing.  This is typically a fly-out window on the right side of the screen.  Allegro is attempting to minimize the route length.  There are other methods too with shapes/voids that can be used as well if interested.

  • Beques

    I tried again with "replace etch" unchecked, and it did the same.  It lets me get 3/4 of the way through routing the trace, then when I go to place the last point to complete the ring, it erases the whole circle and I have to start over.

  • Nayyierwajih

     if you have to make circle then use ADD-->CIRCLE

    if you will use ADD-->ARC W/RADIUS then you will be able to make only arc not complete circle.

    Nayyier

  • redwire

    Agreed that Add->Circle is more appropriate.   I think you are wanting to add vias at specified increments?  You can do this with Edit->Copy, then adjust to "Polar" coordinates and adjust the angle, etc...

    Otherwise you can do the add-Arc method but you need to set up your grids correctly.  Add a via at each segment which is what I think may have been missing?

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