48 lines
1.2 KiB
ReStructuredText
48 lines
1.2 KiB
ReStructuredText
MiM capacitors
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--------------
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Spice Model Information
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~~~~~~~~~~~~~~~~~~~~~~~
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- Cell Name: :cell:`sky130_fd_pr__cap_mim_m3__base`, :cell:`sky130_fd_pr__cap_mim_m4__base`
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- Model Names: :model:`sky130_fd_pr__model__cap_mim`, :model:`sky130_fd_pr__cap_mim_m4`
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Operating Voltages where SPICE models are valid
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- :math:`|V_{c0} – V_{c1}| = 0` to 5.0V
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Details
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~~~~~~~
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The MiM capacitor is constructed using a thin dielectric over metal, followed by a thin conductor layer on top of the dielectric. There are two possible constructions:
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- CAPM over Metal-3
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- CAP2M over Metal-4
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The constructions are identical, and the capacitors may be stacked to maximize total capacitance.
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Electrical specs are listed below:
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.. include:: cap_mim-table0.rst
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The symbol for the MiM capacitor is shown below. Note that the cap model is a sub-circuit which accounts for the parasitic contact resistance and the parasitic capacitance from the bottom plate to substrate.
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|symbol-cap_mim|
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Cell name
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M \* W \* L
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Calc capacitance
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The cross-section of the “stacked” MiM capacitor is shown below:
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|cross-section-cap_mim|
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.. |symbol-cap_mim| image:: symbol-cap_mim.svg
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.. |cross-section-cap_mim| image:: cross-section-cap_mim.svg
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