``` title param temp=27 option scale=1E 6 param supl = 1 8V

Question

``` title param temp=27 option scale=1E 6 param supl = 1 8V paral L = 0 13um Include SkyWater sky130 device models include home konstantinos repos DIR vlsi sky130 fd pr models corners tt spice Vdd vdd 0 supl transistors X1 0 in out 0 sky130 fd pr nfet 01v8 w=1 l=1 m=1 X2 out in Vdd Vdd sky130 fd pr pfet 01v8 w=1 l=1 m=1 Output Load Cout out 0 1fF Input Signals Vin in 0 pulse 0 supl 0 10p 10p 40p 100p ic V out =0V op tran 1p 1u control run plot V in V out endc end```

diadatp · Answer

Removing the ic statement gets the sim to run The transient sim is 1us 1ps = 1 million steps

diadatp · Answer

tran 1p 1u uic tells ngspice how to handle the ic and nodeset conditions There s some explanation in the manual about the difference between the two modes

konstantinos · Answer

Thank you diadatp you are a savior

konstantinos · Answer

So from what i understand initial conditions should not be used

diadatp · Answer

Maybe not for the sim you were running but some circuits might have multiple stable operating points in which case the initial conditions can be used to investigate them

diadatp · Answer

There s still some funny business going on with the segmentation fault which must be investigated but for now the sims are giving expected results

konstantinos · Answer

Yes thank you they run as expected It was my first test circuit so there wasn t any target But it needed to slower the input signal and transient step

konstantinos · Answer

But yes the obvious proble is that in t=0 in is 0 and out is also 0 which is contradictory but i changed ic V out to 1 8 and the problem persisted