I read this document and I want to step the β parameter of a transistor for the below circuit(to see it bigger please left-click on the image below):
Here is the model of the transistor and BF is the β:
.model MyBJT NPN(IS=1E-14 VAF=100 BF=100 IKF=0.3 XTB=1.5 BR=3 CJC=8E-12 CJE=25E-12 TR=100E-9 TF=400E-12 ITF=1 VTF=2 XTF=3 RB=10 RC=.3 RE=.2 Vceo=30 Icrating=800m mfg=NXP)
Then in the above line I change BF to {BF}
And step BF as follows:
.step param BF 10 500 50
and then
.tran 1
But I'm not getting many plots just one.
Am I doing something wrong? Is it even possible what I'm trying to do? Is there a way?
Answer
Jramsay42 is correct.
See the help to .STEP
:
.STEP -- Parameter Sweeps This command causes an analysis to be repeatedly performed while stepping the temperature, a model parameter, a global parameter, or an independent source. Steps may be linear, logarithmic, or specified as a list of values.
Example: .step oct v1 1 20 5
Step independent voltage source V1 from 1 to 20 logarithmically with 5 points per octave.
Example: .step I1 10u 100u 10u
Step independent current source I1 from 10u to 100u in step increments of 10u.
Example: .step param RLOAD LIST 5 10 15
Perform the simulation three times with global parameter Rload being 5, 10 and 15.
Example: .step NPN 2N2222(VAF) 50 100 25
Step NPN model parameter VAF from 50 to 100 in steps of 25.
Example: .step temp -55 125 10
Step the temperature from -55°C to 125°C in 10-degree step. Step sweeps may be nested up to three levels deep.
Which works as you expect it. You also don't have to replace the value of your model by {BF}
in that case, it will just overwrite the value of the model.
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