44 lines
1.6 KiB
ReStructuredText
44 lines
1.6 KiB
ReStructuredText
NMOS ESD FET
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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__nfet_01v8`
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- Model Name: :model:`sky130_fd_pr__esd_nfet_01v8`, :model:`sky130_fd_pr__esd_nfet_g5v0d10v5`, :model:`sky130_fd_pr__esd_nfet_g5v0d10v5_nvt`
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Operating Voltages where SPICE models are valid
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- V\ :sub:`DS` = 0 to 11.0V (:model:`sky130_fd_pr__nfet_g5v0d10v5*`), 0 to 1.95V (:model:`sky130_fd_pr__nfet_01v8*`)
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- V\ :sub:`GS` = 0 to 5.0V (:model:`sky130_fd_pr__nfet_g5v0d10v5*`), 0 to 1.95V (:model:`sky130_fd_pr__nfet_01v8*`)
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- V\ :sub:`BS` = 0 to -5.5V, (:model:`sky130_fd_pr__nfet_g5v0d10v5`), +0.3 to -5.5V (:model:`sky130_fd_pr__nfet_05v0_nvt`), 0 to -1.95V (:model:`sky130_fd_pr__nfet_01v8*`)
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Details
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~~~~~~~
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The ESD FET’s differ from the regular NMOS devices in several aspects, most notably:
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- Increased isolation spacing from contacts to surrounding STI
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- Increased drain contact-to-gate spacing
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- Placement of n-well under the drain contacts
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Major model output parameters are shown below and compared against the EDR (e-test) specs
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.. include:: esd_nfet-table0.rst
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The symbols of the :model:`sky130_fd_pr__esd_nfet_g5v0d10v5` and :model:`sky130_fd_pr__esd_nfet_g5v0d10v5_nvt` (ESD NMOS FET) are shown below:
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|symbol-esd_nfet_g5v0d10v5| |symbol-esd_nfet_g5v0d10v5_nvt|
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The cross-section of the ESD NMOS FET is shown below.
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|cross-section-esd_nfet|
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.. |symbol-esd_nfet_g5v0d10v5| image:: symbol-esd_nfet_g5v0d10v5.svg
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.. |symbol-esd_nfet_g5v0d10v5_nvt| image:: symbol-esd_nfet_g5v0d10v5_nvt.svg
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.. |cross-section-esd_nfet| image:: cross-section-esd_nfet.svg
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