@User Well, this is the kind of thing I was thinking:

** Regression Sim
.param vdd_val=3.3
.param temp_val=27
.param cnr_val="tt"

.option temp=temp_val
.lib '/usr/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice' cnr_val

V_VDD VDD GND DC vdd_val
*** Rest of circuit here...

.CONTROL
save @M.*[*]
foreach vdd_loop 2.97 3.3 3.63
	foreach temp_loop -40 27 130
		foreach cnr_loop "tt" "ss" "ff"
			alterparam vdd_val  = $vdd_loop
			alterparam temp_val = $temp_loop
			alterparam cnr_val  = $cnr_loop
			op
			print @M.*[*]
		end $ foreach cnr_loop
	end $ foreach temp_loop
end $ foreach vdd_loop
.endc
.end

Now, that

alterparam

stuff could be very wrong; I haven't really tried it yet. I fear there might be some setting of

curplot

involved. But, that's the gist of what what I'm looking to do, with the example showing the simple case of oppoint corners.

If that works, then great. My approach is to write a python script that generates all the variables; I have a nice system on efabless called CACE that takes a testbench and a configuration file and then runs over all process corners, temperatures, voltages, and whatever else you want to loop over, and runs P*V*T individual simulations. One huge advantage is that it can run all simulations in parallel.

Could you please share your script with which you simulated the PVT?