Is there a document contain the technology paramet...
# sky130e
Eslam Morsie
04/25/2021, 8:47 AMIs there a document contain the technology parameters of mosfets of sky130 like uncox , lambda , etc. ? please provide a link.
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Lofty
04/25/2021, 10:45 AMhttps://skywater-pdk.readthedocs.io/en/latest/rules/assumptions.html
Maybe you want this one?
Lofty
04/25/2021, 10:46 AMAs I understand it, lambda is 0.15um
Lofty
04/25/2021, 10:47 AM(Based on the Poly 1 minimum critical dimension)
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Eslam Morsie
04/25/2021, 10:53 AMhow to get Uncox and Upcox or what its name in this manual ?
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Lofty
04/25/2021, 10:56 AMThe process stack diagram lists K values
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Luis Henrique Rodovalho
04/25/2021, 3:19 PMAll these parameters can be found in the transistor BSIM model files... and they are buried among zillions of lines. + u0 = 0.0318614 for the nfet_1v8, for example. https://raw.githubusercontent.com/google/skywater-pdk-libs-sky130_fd_pr/f62031a1be9aefe90[…]36/cells/nfet_01v8/sky130_fd_pr__nfet_01v8__tt.pm3.spice
Luis Henrique Rodovalho
04/25/2021, 3:26 PMBut it doesn't matter, really. The model takes into account many variables, such as the transistor physical dimensions, terminal voltages, process variability, temperature, etc, to calculate these parameters. The best thing you can do is extract those parameters with your own testbench for the transistor dimensions you plan to use in your designs.
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J. Scott Elder
04/26/2021, 8:27 PMThe BSIM model has roughly 1000 equations and a couple hundred parameters. The days are long gone where Level 1 or Level 2 spice models were used. Just simulate a the device, or devices, and measure the "text book" values.
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Lofty
04/27/2021, 1:26 PMIs it expected that it takes way longer to simulate with the vendor transistor model than with the default ngspice model?
Lofty
04/27/2021, 2:22 PM(Answer: no, the model that SkyWater provide is not a mosfet but a subcircuit, and ngspice complains)
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