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发表于 2010-1-5 11:16:56
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If you are asking the CAPACITANCE of the contact, not the resitance, you must mean the contact to poly gate coupling capacitance, it should be small as the spacing is rather large in 0.18u, you could omit in your simulation, and generally foundry won't consider this in the RC extraction.
For metal capacitance, it is usually assumed cap per unit length by assuming miminum metal width. The value is dependent on the local environment such as spacing, swticng signal..., but for typical values you can use 0.2~0.3fF/um for minimum pitch and grounded lines up/below/around. This value decreases slowly as process shrinks. |
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