I want to sweep the voltage source

V2

and plot the output impedance (

Rout

) of a circuit, where

Rout

is defined as

Vout / Iout

, in an AC analysis (not DC). Specifically: • X-Axis: Voltage of the source

V2

(swept over a range). • Y-Axis: Output impedance

Rout = v(out) / i(V2)

calculated during the sweep. how can i do this in ngspice ?

.dc v2 10m 2 10m .control run let rout = deriv(vout)/deriv(i(v2)) let va = i(v2)/deriv(i(v2)) plot rout plot va .endc

@Luis Henrique Rodovalho thank yo so much you saved me a lot of time