P
Pete Clark
- Jan 1, 1970
- 0
Hi,
I want to know how to vary a parameter inside a model and get the
results in one run (one simulation). I've given a simple circuit below
that I would also want to do .TRAN and .AC analysis on. (Like run an AC
response for three transistor values of Bf.) I've managed to do .TEMP
parameterization, but I can't figure out how to do something like Bf.
For the purpose of example, what syntax would I add to parameterize the
Beta_forward (Bf) to values of 50, 125, and 300? (The model is the one
that comes with LTSPICE, BTW.)
I have been trying to learn on the latest version LTSPICE, if that
matters.
Thanks,
Pete
Here is an example circuit:
---------------------------
2n3904_00
* Vcc
* .-----.
* | |
* ---V1 |
* - 5V .-.
* | | |R1
* === | |2k7
* GND '-'
* |
* .-----o
* | |
* .-. |Vc
* | |R3 |
* | |13k |
* '-' |
* |Vb |/ 2n3904
* o---| Q1
* | |>
* .-. |
* | |R2 |
* | |6k8 |
* '-' |
* | |
* '-----o
* |
* ===
* GND
*
*
*(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)
Q1 Vc Vb 0 0 2N3904
R1 Vcc Vc 2.7k
R2 Vb 0 6.8k
R3 Vc Vb 13k
V1 Vcc 0 5
..model 2N3904 NPN (
+IS=1E-14
+VAF=100
+Bf=300
+IKF=0.4
+XTB=1.5
+BR=4
+CJC=4E-12
+CJE=8E-12
+RB=20
+RC=0.1
+RE=0.1
+TR=250E-9
+TF=350E-12
+ITF=1
+VTF=2
+XTF=3
+Vceo=40
+Icrating=200m
+mfg=Philips
+)
..op
..end
I want to know how to vary a parameter inside a model and get the
results in one run (one simulation). I've given a simple circuit below
that I would also want to do .TRAN and .AC analysis on. (Like run an AC
response for three transistor values of Bf.) I've managed to do .TEMP
parameterization, but I can't figure out how to do something like Bf.
For the purpose of example, what syntax would I add to parameterize the
Beta_forward (Bf) to values of 50, 125, and 300? (The model is the one
that comes with LTSPICE, BTW.)
I have been trying to learn on the latest version LTSPICE, if that
matters.
Thanks,
Pete
Here is an example circuit:
---------------------------
2n3904_00
* Vcc
* .-----.
* | |
* ---V1 |
* - 5V .-.
* | | |R1
* === | |2k7
* GND '-'
* |
* .-----o
* | |
* .-. |Vc
* | |R3 |
* | |13k |
* '-' |
* |Vb |/ 2n3904
* o---| Q1
* | |>
* .-. |
* | |R2 |
* | |6k8 |
* '-' |
* | |
* '-----o
* |
* ===
* GND
*
*
*(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)
Q1 Vc Vb 0 0 2N3904
R1 Vcc Vc 2.7k
R2 Vb 0 6.8k
R3 Vc Vb 13k
V1 Vcc 0 5
..model 2N3904 NPN (
+IS=1E-14
+VAF=100
+Bf=300
+IKF=0.4
+XTB=1.5
+BR=4
+CJC=4E-12
+CJE=8E-12
+RB=20
+RC=0.1
+RE=0.1
+TR=250E-9
+TF=350E-12
+ITF=1
+VTF=2
+XTF=3
+Vceo=40
+Icrating=200m
+mfg=Philips
+)
..op
..end