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Single layer boards

labrat7

Has anyone done anything with single layer flexible cirtuit boards?

I am having trouble finding out how to define the cross section for only one layer. The layout cross section window says I can't delete either the TOP layer or the BOTTOM layer.

The board I am designing has pads on both sides of a single layer of conductive material.

Any help would be appreciated.

  • The tool does require you to have at least the two layers in your design. This is because it assumes that you would need different layers to represent the top versus the bottom side of the physical substrate.

    You stated that your design has pads on both the top and bottom sides of the layer. Assuming your conductor traces are on a layer "M1", what layer would the top and bottom pads go on, relative to M1? Would these need to be on separate layers so that the tool can effectively DRC the bottom pads against each other and separate from the top pads?

    Based on that, we might be able to offer some reasonable solution(s) that will be understood by the other parts of the system.

  • "pads on both sides of a single layer" is a bit confusing.

    Do you have component pads and routing only on one layer (top)?

    If yes, consider a two layer board and send only the top layer GBR.

    If you have at least a via, it is a two layer board.

     

  • The circuit board is a flexible design using polyimide film as the board material. The “M1” layer has 3 copper traces ½” wide running the length. The pads on each end need to be open on the bottom while the 2 sets of pads near the center need to be on top.

    See the attached bitmap.
  • The board is a flexible board using only Polyimide insulating material and copper.

    Components J1 & J2 need to be facing the bottom while U1 & U2 need to be facing towards the top.

    This is a high voltage, high current pulse design and vias would add too much inductive loading.

    See attached bitmap.
  • Okay, silly me! I thought I was emailing directly to you two and attached a bitmap so you could see my problem. I guess you didn't get those...

    I have a 0.5" square at each end of a 7 inch flexible circuit board. Assuming 0,0 is on the lower left corner, about an inch to the right of the first o.5" pad is a pair of 0.1" wide by 0.4" high pads, the left one connected to the half inch pad to its left and the right one connected to the left pad a second set of pods. The right pad on this second set of pads is connected to the 0.5" pad on the righ side of the board. I am using 0.5" wide copper pours to connect this together.

    Since the Polyimide material acts as both the board material and the soldermask, I need the soldermask on the end pads to be on the bottom while the pads in the top.

    I have tried to draw the polyimide material, with the cutouts in the polyimide material below. The P's represent the polyimide material. The spaces represent gaps in the material and the C's lines represent the copper pours.

    PPPPPPPPP   PPPPPP   PPPPPP   PPPPPPP   PPPPPPPPPPPPPPPPPPPPPPPPPP
     CCCCCCCCCC    CCCCCCCCCCCC     CCCCCCCCCCCCCCCCCCCCCCCC
    PPP     PPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP    PPP

    Does this make any sense?
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