TINA/Spice: Importing spice model failure

Emmanouil Tsachalidis

Intellectual 850 points

Other Parts Discussed in Thread: TINA-TI

Tool/software: TINA-TI or Spice Models

Hi,

I have read the related BF862 post in the forum but that was back in 2013-14.

The model that NXP has now in their website is somewhat different:

See here: www.nxp.com/.../BF862.prm

*   BF862 SPICE MODEL MARCH 2007 NXP SEMICONDUCTORS
*   ENVELOPE    SOT23
*   JBF862: 1, Drain, 2,Gate, 3,Source
.SUBCKT BF862 1 2 3
Ld 1 4 L=   1.1nH
Ls 3 6 L=   1.25nH
Lg 2 5 L=   0.78nH
Rg 5 7 R=   0.535 Ohm
Cds 1 3 C=   0.0001pF
Cgs 2 3 C=   1.05pF
Cgd 1 2 C=   0.201pF
Co 4 6 C=   0.35092pF
Q1 4 7 6 JBF862
.model JBF862 NJF(Beta=47.800E-3 Betatce=-.5 Rd=.8 Rs=7.5000 Lambda=37.300E-3 Vto=-.57093
+ Vtotc=-2.0000E-3 Is=424.60E-12 Isr=2.995p N=1 Nr=2 Xti=3 Alpha=-1.0000E-3
+ Vk=59.97 Cgd=7.4002E-12 M=.6015 Pb=.5 Fc=.5 Cgs=8.2890E-12 Kf=87.5E-18
+ Af=1)
.ENDS BF862

There were a few references as to what modifications must be made to the file contents so that it can be imported into TINA.

I tried the removing the dot before the "SUBCKT" string without luck.

Is there anything else i can do to successfully import that file into TINA in orded to get a valid TSM model file?

Regards

Manos Tsachalidis

over 5 years ago

0 Imran Dharwad over 5 years ago

TI__Intellectual 1440 points

Hi Manos,

Thanks for reaching out to us.

Please remove only the highlighted section below to import file successfully in TINA-TI.

0 Emmanouil Tsachalidis over 5 years ago in reply to Imran Dharwad

Intellectual 850 points

Hi Imran and thanks for your msg,

I erased the "L=", "R=" & "C=" strings as you suggested.

After erasing the strings you suggested the text in the spice model file looked like this:

* BF862 SPICE MODEL MARCH 2007 NXP SEMICONDUCTORS

* ENVELOPE SOT23

* JBF862: 1, Drain, 2,Gate, 3,Source

.SUBCKT BF862 1 2 3

Ld 1 4 1.1nH

Ls 3 6 1.25nH

Lg 2 5 0.78nH

Rg 5 7 0.535 Ohm

Cds 1 3 0.0001pF

Cgs 2 3 1.05pF

Cgd 1 2 0.201pF

Co 4 6 0.35092pF

Q1 4 7 6 JBF862

.model JBF862 NJF(Beta=47.800E-3 Betatce=-.5 Rd=.8 Rs=7.5000 Lambda=37.300E-3 Vto=-.57093

+ Vtotc=-2.0000E-3 Is=424.60E-12 Isr=2.995p N=1 Nr=2 Xti=3 Alpha=-1.0000E-3

+ Vk=59.97 Cgd=7.4002E-12 M=.6015 Pb=.5 Fc=.5 Cgs=8.2890E-12 Kf=87.5E-18

+ Af=1)

.ENDS BF862

I renamed the file from whatever it was to a .lib file and i used the "New macro wizard" menu to import it. It went smoothly without any error messages.

Then i tried the model in TINA and here is what i got:

As you can see the simulation doesn't look good. The two currents should be exactly the same but they are not.

I would be grateful if you suggested a fix.

Regards

Manos Tsachalidis

0 Imran Dharwad over 5 years ago in reply to Emmanouil Tsachalidis

TI__Intellectual 1440 points

Hi Manos,

Kindly share the TSC file to look into the issue.
Also with your above message, it looks like you are getting two different simulation results for same settings and testbench.