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Capacitor simulation

结论:smic40工艺,MOM电容的标准差σ大约为0.05fF,与电容绝对值无关。


smic40_mom_cap_variation

  1. PDK中MOM cap仿真结果:

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  1. 看看电容值偏差

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从图中可以看到 $CV = 4.77/C$, CV (co-efficient of variation)是离散系数,C是电容均值。

把横轴改为1/C,可以更直观地看到CV和C成反比,其系数正是标准差σ。

SMIC40nm工艺,MOM电容的标准差σ=0.047fF (考虑PVT,大概在0.05fF左右)

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附录:电容仿真设置

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simultaneously run simulations with different views

simultaneously replace library name and cell name of cells in ADE schematic