@Tim Edwards the

sky130*.tech

extracts m3-m4 mim capacitors as

sky130_fd_pr__cap_mim_m3_1

and m4-m5 mim capacitors as

sky130_fd_pr__cap_mim_m3_2

. The xschem models match the extracted models. However, the documentation at https://skywater-pdk.readthedocs.io/en/main/rules/device-details.html#mim-capacitors has

Spice Model Information¶
Cell Name: sky130_fd_pr__cap_mim_m3__base, sky130_fd_pr__cap_mim_m4__base

Model Names: sky130_fd_pr__model__cap_mim, sky130_fd_pr__cap_mim_m4

What about adjusting the model names for clarity? For example,

sky130_fd_pr__cap_mim_m3

,

sky130_fd_pr__cap_mim_m4

.

The

m3_1

and

m3_2

is a mistake that got into the Google repo. It can be corrected if the original incorrect names are left in the PDK as subcircuit wrappers pointing to the same models so as not to break backwards compatibility with existing designs.