I am trying to plot a basic inverter. Warning says

nfet

has zero length but in circuit you can see length being

.035um

. Also when I try to plot v(Vin), it says no vector available. can anyone help on this? I am able to run

test_cmos

and

waveforms

are being plotted.

code_shown.sym

is as follows name=NGSPICE only_toplevel=false value=" .option wnflag=1 .option savecurrents .control dc Vin 0 1.8 0.1 op write test.raw save all set appendwrite .endc "

the warning is about ib (body current) vector having no values (there is no body current in this simulation). To get rid of the warning add command

remzerovec

before the write command.

thanks

try

plot dc1.vout dc1.vin

If you comment the op command dc1 becomes the default so you can just

plot vin vout

. Another way is to set the default plot:

setplot dc1

ALso note that your write command saves only the operating point. The order of commands in your .control section should be:

.control
  save all
  dc Vin 0 1.8 0.1
  remzerovec
  write test.raw
  set appendwrite
  op
  remzerovec
  write test.raw
.endc

Thank you very much. Its working now. I will now check on how to write these commands from user manual. Thank you very much