could I get a bit of help with extracting for simu...
# magicm
Matt Venn
10/13/2020, 9:53 AMcould I get a bit of help with extracting for simulation
Matt Venn
10/13/2020, 9:53 AMI put this together before the sky130 release: https://github.com/mattvenn/magic-inverter
Matt Venn
10/13/2020, 9:54 AMnow I'd like to convert to the sky130 tech files
Matt Venn
10/13/2020, 9:55 AMthere is a branch in that repo called sky130 where I am working on this
Matt Venn
10/13/2020, 9:56 AMI needed to change a few layer names in the inverter.mag file, and now I can open it and extract it with magic: magic -rcfile sky130A.magicrc inverter.mag
Matt Venn
10/13/2020, 9:57 AMbut now I can't convert it to a spice file
Matt Venn
10/13/2020, 9:57 AMthis rusn: ext2spice -p $PDKPATH inverter.ext
Matt Venn
10/13/2020, 9:57 AMbut doesn't produce any output
Matt Venn
10/13/2020, 9:58 AMor errors
Matt Venn
10/13/2020, 10:00 AMalso, where is the spice models for the nmos and pmos transistors? the pdk doesn't seem to contain them.
Matt Venn
10/13/2020, 10:08 AMaha, if I run ext2spice inside magic instead of on the cli it works
Matt Venn
10/13/2020, 10:23 AMso I have a spice file now, but I can't simulate it as before
Matt Venn
10/13/2020, 10:23 AMScreenshot from 2020-10-13 12-23-12.png
Matt Venn
10/13/2020, 10:23 AMmy spice isn't good enough to know whats wrong here.
Matt Venn
10/13/2020, 10:23 AMthe previous working one looked like this
Matt Venn
10/13/2020, 10:24 AMScreenshot from 2020-10-13 12-23-46.png
Matt Venn
10/13/2020, 12:03 PMok I have given up on my original inverter as I think switching to the new tech library has broken it. That's why it looks exploded in the 3d view.
Matt Venn
10/13/2020, 12:04 PMAlso it had lots of DRC errors
Matt Venn
10/13/2020, 12:04 PMinstead I've loaded an inverter standard cell
Matt Venn
10/13/2020, 12:04 PM(see the makefile on the sky130 branch: https://github.com/mattvenn/magic-inverter/blob/2b23a67db3e6ef80728e03e8b36768d77e20b709/Makefile#L8
Matt Venn
10/13/2020, 12:04 PMthen I extract, ext2spice
Matt Venn
10/13/2020, 12:04 PMand run make sim
Matt Venn
10/13/2020, 12:05 PMwhich results in some errors from ngspice
Matt Venn
10/13/2020, 12:05 PMScreenshot from 2020-10-13 14-05-11.png
Matt Venn
10/13/2020, 12:07 PMthis might be to do with 0 resistances somewhere?
Matt Venn
10/13/2020, 4:34 PMok I resolved this over in the #analog-design analog channel with thanks to @Stefan Schippers @Pepijn de Vos and @konstantinos
Matt Venn
10/13/2020, 4:34 PM