Hello all. Please what am I doing wrong here? I'm trying to plot using the Xschem waveform viewer. I'm trying to do a .ac plot but I'm not getting the expected waveform. @Stefan Schippers

With "not the expected waveform" what exactly do you mean? In general for frequency plots you should set

log scale X axis

(see the checkbutton in graphdialog) and set the voltage in dB: replace

vout

with

"vout db20()"

(including double quotes). After these changes do a full zoom on the X axis ('f' key inside the graph) and on the y axis ('f' key on the left of the y axis).

Thank you verymuch @Stefan Schippers setting the X axis scale to log made it work.