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Checking connectivity on a large array of metal structures

oldnick

I'm having trouble figuring out how to verify a design of a CCD array we have. The array consists of many rows/columns of pixels which, but there is no schematic for the pixel as the layout is 4 metal rectangle which stretch across the width of the cell with vias to the substrate (the substrate has several customer specific layers which allow a CCD to be fabricated on CMOS technology - we have no access to what these layers are). These 4 metal lines are the CCD clocks, p1, p2, p3, p4. It is at the left side of the array every all clock phases are connected together (al p1's connected together, all p2's connected together) and then out to the 4 pads.

one missing via etc. will render the array useless so a robust verification strategy is required, but I'm having trouble figuring out how to do this as there is no circuit to be used for comparison. Ideally we'd want a continuity check from say, each of the clock lines in every pixel to the pad. The best I can see so far is highlight nets, then zoom in and check every thing by eye. But in a mega pixel camera this isn't feasible or robust.

I've tried making a schematic with just 4 pins and comparing that against a pixel, this lvs's with a single pixel, but as soon as you combine 2 or more it falls over.

There must be a way of doing this. Is there some connectivity check between 2 points I could write a script to repeat for a whole array counting the errors or something? 

Any help would be greatly appreciated.

Parents

  • Cheers Ted,

    That's a lot of help. That's not something I knew about until you mentioned it. I've had a quick read of the LVS user guide and I think I understand what has to be done and it sounds like it'll work. I just need to figure out how to do it now...I think the CTM layer that is peculiar to the pixels will make this a bit easier.

    Cheers.

Reply

  • Cheers Ted,

    That's a lot of help. That's not something I knew about until you mentioned it. I've had a quick read of the LVS user guide and I think I understand what has to be done and it sounds like it'll work. I just need to figure out how to do it now...I think the CTM layer that is peculiar to the pixels will make this a bit easier.

    Cheers.

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