:wave: Hello, team! Thanks for offering something ...
# sky130c
Charles White
06/02/2022, 9:16 AM👋 Hello, team! Thanks for offering something like this! I'm trying to get started with some ngspice simulations for the mosfets in the sky130_pr library. I haven't looked at any layouts or DRC's so I'm wondering what would be appropriate values for: as ad ps pd (in terms of w, l and NF). Thanks!
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Kunal
06/02/2022, 10:11 AMOne of the IP link from below should help
https://www.vlsisystemdesign.com/ip/
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Charles White
06/02/2022, 6:43 PMThat was helpful, thanks! I found this:
Charles White
06/02/2022, 6:43 PMad='int((nf+1)/2) * W/nf * 0.29'
+ as='int((nf+2)/2) * W/nf * 0.29' pd='2*int((nf+1)/2) * (W/nf + 0.29)' ps='2*int((nf+2)/2) * (W/nf + 0.29)'
Charles White
06/02/2022, 6:43 PMCharles White
06/02/2022, 6:45 PMDo you think that's accurate? I guess I assumed skywater would have more accurate information, maybe relating to the DRC minimums, or recommended sizes.
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Kunal
06/03/2022, 1:05 AM@Swarup Pulujkar
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Charles White
06/03/2022, 1:21 AMThanks for your help. As well as ad,as,pd,ps I'm also having a hard time finding stress parameters such as sa,sd and sb. I'm mainly following ON semiconductors presentation but of course that's for a totally different process. Is it safe to assume the skywater 130 process is about the same?
Charles White
06/03/2022, 2:20 AMActually I found a better reference, the BSIM4 manual. Maybe this is the solution:
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Swarup Pulujkar
06/03/2022, 5:06 AMHi, when I designed a schematic in XSCHEM some of the parameters like pd, ps were added into the spice deck by the tool itself. If I remember correctly, we removed these parameters from the spice deck after some discussions( check the post layout spice deck).
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