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TAP cell in 28nm Kit

cupidsd
We are designing a 28nm test chip, but right now we run into a problem about tap cells. In order to make a good ohmic contact for wells, we usually add well contacts, which requires additional active regions. But this is not the case in 28nm. Instead, tap cells are recommended. But I do not know the max distance between these tap cells, and how to use them. I guess it is defined somewhere in PDK, so can you help us find out this? Thanks a lot. By the way, can we use these tap cells for both NMOS and PMOS transistors?
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  • Thanks  a lot, Quek.

    Thats what i ususally do, trial and error. :)

    But the issue for me is i did not find any TAP cells. Actually I have no idea what these cells look like. I found a layer named TAP, which is like METAL1. Its only a layer, so how to use it in our design? If its only a layer, how does it work, im quite curious.

    Thanks again. 

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  • Thanks  a lot, Quek.

    Thats what i ususally do, trial and error. :)

    But the issue for me is i did not find any TAP cells. Actually I have no idea what these cells look like. I found a layer named TAP, which is like METAL1. Its only a layer, so how to use it in our design? If its only a layer, how does it work, im quite curious.

    Thanks again. 

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