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code from nsgspice manual , 24 version ,page372
Small Signal Amplifier
*This circuit simulates a small signal amplifier
*with a diode limiter.
.dc Vin -1 1 .05
Vin Input 0 DC 0
R_source Input Amp_In 100
D_Neg 0 Amp_In 1n4148
D_Pos Amp_In 0 1n4148
C1 Amp_In 0 1uF
A1 Amp_In 0 Amp_Out Amplifier
R_Load Amp_Out 0 1000
.model 1n4148 D (is=2.495E-09 rs=4.755E-01 n=1.679E+00
+ tt=3.030E-09 cjo=1.700E-12 vj=1 m=1.959E-01 bv=1.000E+02
.model Amplifier Amp (gain = -10 in_offset = 1e-3
+ rin = 1meg rout = 0.4)
Error on line 15 : a1 amp_in 0 amp_out amplifier
MIF-ERROR - unable to find definition of model amplifier
Model issue on line 22 : .model amplifier amp (gain=-10 in_offset=1e-3 rin=1meg r …
Unknown model type amp - ignored
from the manual:
Subsequent sections of this document detail the steps required to
create such a Code Model and include it in the XSPICE simulator.
In other words, the xspice "amp" is not part of ngspice,
but is an exercise on "how to create your own xpsice model"
some pages later you will find an example
which is using the already existing xspice model "gain"
Amplifier with XSPICE model “gain”
thanks. I found it just now.