LVS behaviour with parallel MIM Capacitors

[adrienluitot]

When I stick 2 MIM caps with through Metal 5 and TopMetal 1 to use them in parallel, the LVS won't detect the capacitors at all. (Case 1)
If I space them, the LVS will detect 2 independent MIM caps. (Case 2)
And if keep the space, but fill it with Metal 5 and TopMetal 1 to connect them as if they were stuck, the LVS detect 1 MIM cap with a multiplier=2. (Case 3)

For the case 2 and 3, the space can be as small as 0.005um.

In the end, what I would expect, is a Layout like in case 1, but with LVS results like in case 3.
I don't really understand why the LVS results between case 1 and 3 are so different.

Also, maybe I'm not doing the parallelisation properly?

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Case 1

Layout:

LVS:

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Case 2

Layout:

LVS:

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Case 3

Layout:

LVS:

[sergeiandreyev]

Hi @atorkmabrains, @FaragElsayed2, could you please take a look?

[FaragElsayed2]

Hi @adrienluitot

Could you share the test cases you mentioned?