Do the corner simulations ss,ff,fs,sf model the resistor and cap variations with process.

ss/ff/fs/sf corners all use typical resistors/capacitors. hh/ll/lh/hl corners apply to resistors and capacitors, while using typical transistors. lh --> low resistances, high capacitances

Can we use hh/ll/lh/hl together with ss/ff/fs/sf.

I think you can do that but you must manually call the various corner files: remove the

.lib

in your netlist and replace with these lines: .param mc_mm_switch=0 .param mc_pr_switch=0 .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/corners/`tt`.spice .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/r+c/res_`typical`__cap_`typical`.spice .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/r+c/res_`typical`__cap_`typical`__lin.spice .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/corners/`tt`/specialized_cells.spice In above lines put the correct path to your libs.tech installation (the above is the path on my system). then replace the

tt

with one of

ss

,

sf

,

fs

,

ff

for transistor corners. and replace

typical

with

high

or

low

for resistor and capacitor corners. First

typical

applies to resistor, second one for capacitors. I have not tried mixing transistor and res/cap corners, but it should work. Example: slow transistor corner, high resistances, low capacitances: .param mc_mm_switch=0 .param mc_pr_switch=0 .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/corners/`ss`.spice .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/r+c/res_`high`__cap_`low`.spice .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/r+c/res_`high`__cap_`low`__lin.spice .include /home/schippes/share/pdk/sky130A/libs.tech/ngspice/corners/`ss`/specialized_cells.spice

Thanks.