hi all I wants do get gain vs frequency response How do i ge

Question

hi all I wants do get gain vs frequency response How do i get I tried please check < srinivasan muthukrishnan19> < Piyush Dwivedi> hi < Stefan Schippers> could you help me here I am doing ac analysis but getting as transient like time domain vs gain I need a plot frequency vs gain How can I do

Stefan Schippers · Answer

you have a tran and an AC analysis you must select the ac analysis to plot ac results `echo $plots` `setplot ac1`

Charly Meyer · Answer

tran simulation and ac simulation are lunch in same time AC simulation is just ignored

Stefan Schippers · Answer

I try to repeat Before giving the `plot` command you must give the command `setplot ac1` otherwise you are seeing the output voltage and phase of a transient simulation because this is the last simulation ran by ngspice Since transient data is real and not complex phase is always zero

Stefan Schippers · Answer

Another simple possibility is to comment out the `tran` line and the `write` command after tran and the `set appendwrite`

srinivasan_muthukrishnan19 · Answer

< Stefan Schippers> can we skip setplot ac1 if we run just ac analysis

Stefan Schippers · Answer

Yes the current plot is always the last simulation done