@Tim Edwards in a very recent open_pdks reinstall mismatch is (again) non functional. There is a change in definition of variation parameters: See for example the

vth0

parameter in `sky130_fd_pr__pfet_01v8__tt.pm3.spice`: • old pdk (working), Oct 21.

* Threshold Voltage Parameters

+ vth0 = {-1.05955351+MC_MM_SWITCH*AGAUSS(0,1.0,1)*(sky130_fd_pr__pfet_01v8__vth0_slope/sqrt(l*w*mult))}

• New pdk (not working), Nov 17

* Threshold Voltage Parameters

+ vth0 = {-1.05955351+sky130_fd_pr__pfet_01v8__vth0_slope_spectre*(sky130_fd_pr__pfet_01v8__vth0_slope/sqrt(l*w*mult))}

Basically the old pdk uses

MC_MM_SWITCH

, set to 1 in the

tt_mm

corner and the

AGAUSS()

function. The new pdk uses

sky130_fd_pr__pfet_01v8__vth0_slope_spectre

which is set to 0 at the beginning of the file:

.param sky130_fd_pr__pfet_01v8__vth0_slope_spectre = 0.0