I'm using open_pdks v 1.0.393 and the pfet file doesn't seem to have any bins in it. Is this something that has always been this way? The equivalent nfet corner file, has all the bin parameters in it. @Tim Edwards?

./sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__pfet_01v8__tt.corner.spice
* Copyright 2020 The SkyWater PDK Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     <https://www.apache.org/licenses/LICENSE-2.0>
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.

* SKY130 Spice File.
* Number of bins: 52
.param
+ sky130_fd_pr__pfet_01v8__ajunction_mult = 9.9626e-1
+ sky130_fd_pr__pfet_01v8__pjunction_mult = 1.0009e+0
.include "sky130_fd_pr__pfet_01v8__tt.pm3.spice"

I believe the

.model

bins are in the included

sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__pfet_01v8__tt.pm3.spice

file.

Oh, interesting, so they intentionally just don't have a bunch of unique parameters per bin like the nmos model:

./sky130A/libs.ref/sky130_fd_pr/spice/sky130_fd_pr__nfet_01v8__tt.corner.spice
* Copyright 2020 The SkyWater PDK Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     <https://www.apache.org/licenses/LICENSE-2.0>
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.

* SKY130 Spice File.
* Number of bins: 63
.param
+ sky130_fd_pr__nfet_01v8__toxe_mult = 1.0
+ sky130_fd_pr__nfet_01v8__rshn_mult = 1.0
+ sky130_fd_pr__nfet_01v8__overlap_mult = 0.9642
+ sky130_fd_pr__nfet_01v8__lint_diff = 0.0
+ sky130_fd_pr__nfet_01v8__wint_diff = 0.0
+ sky130_fd_pr__nfet_01v8__dlc_diff = -.61492e-9
+ sky130_fd_pr__nfet_01v8__dwc_diff = 0.0
*
* sky130_fd_pr__nfet_01v8, Bin 000, W = 1.26, L = 0.15
* -----------------------------------
+ sky130_fd_pr__nfet_01v8__voff_diff_0 = 0.0
+ sky130_fd_pr__nfet_01v8__kt1_diff_0 = 0.0
+ sky130_fd_pr__nfet_01v8__ub_diff_0 = -1.1675e-19

but you are right the nfet corner.spice file defines some per-bin parameters that the pfet corner.spice does not. However I don't see these nfet parameters used in the pm3.spice file, so Not sure what is being done there...

@Matthew Guthaus: Like the sausage manufacturing process, you should never inspect the PDK too closely.