Need help for BFP450 SPICE model

hi everyone,

I'm designing a power amplifier using BFP450, and previously i've have done a project using BFP420 from infieon.

Now i'm am looking for the SPICE model of BFP450 which i couldn't find from infineon website.

*to make things clear, i will attach a picture (BFP420 SPICE.PNG) to show what i am looking for. The picture (BFP420 SPICE.PNG) is the file i gotten from infineon. However, for BFP450, i only found a simpler model (BFP450.PNG).

can anyone explain the difference of having CBCpar, CBEpar and CCEpar instead of not having them?

thanks in advance

I think you can use the simpler model for BFP450. CBCpar is meaning the parastic capacitance of base and collector. Always this capacitance value is very small, such as 0.1pF, so sometimes it is neglected.

hi tony,

thank u very much, i'm trying now.
by the way, do u have any idea on plotting P1db?

There are some examples in ADS OR AWR OR in this forum to plot P1dB, you can try to find it. These examples describe how to get P1dB from S parameters.

.MODEL BFP450 NPN(
IS = 1.3125e-16
BF = 76.123
NF = 0.79652
VAF = 24.165
IKF = 0.58905
ISE = 2.8341e-14
NE = 1.5563
BR = 21.254
NR = 1.2966
VAR = 13.461
IKR = 0.25878
ISC = 1.2292e-17
NC = 0.70543
RBM = 2.1659
IRB = 1.3181e-05
RB = 5.403
RE = 0.45346
RC = 0.50084
CJE = 3.2276e-15
VJE = 0.95292
MJE = 0.48672
TF = 7.5068e-12
XTF = 0.69972
VTF = 0.66148
ITF = 1.7655e-05
PTF = 0
CJC = 1.0495e-12
VJC = 1.1487
MJC = 0.50644
XCJC = 0.28285
TR = 2.6912e-09
CJS= 0
VJS = 0.75
MJS = 0
XTB = 0
EG = 1.11
XTI = 3
FC = 0.91274)

hi tony,
I have gone through the net to search for these examples, but i couldnt find them.
Do you have any links?

thanks!

Hi, johnnykhor,

Attached is an article that describe how to get OIP3 and P1 from other paras of BJT. Hope this can help you.

I remember some articles described how to get P1 from s-parameters, but I forgot where I put them.

PS: In ADS, you can open a worksheet, at designguide-->Amplifier-->2-Tone nonlinear simulations--> there are some examples there.