Hi all, I plot Phase. Can any one suggest to plot Magnitude ? What code i need to write in ngspice @Stefan Schippers

Did you try "plot v(vout)"?

plot db(vout)

@ALOK PRATAP SINGH ngspice saves ac vectors as complex values (real and imaginary parts) The

db(out)

function as @Luis Henrique Rodovalho said calculates

20 *log10(mag(out))

, where

mag()

calculates the (euclidean) magnitude of the complex vector