non-linear device models: gbjt

Hi! I want to simulate the circuit of LNA. Therefore, I need the file that inculde the S-parameter. Does someone could tell me where should I get it? TKS.

S2p files are available for devices such as transistors, diodes etc.
Which transistor u r using?
u can get the S2p files from website of the company(check your transistor company name).
tell me if u still have problem.
Abhishekabs

Dear Sir:
The Transistor's model name is BFG425W. The name of bender is philips. I can't find any sources that provide the file. Could u tell mee where should I get it? TKS

give me the specification u need.
for exapmle Vgs=2v Id=10mA etc.
I wil search for u

Added after 7 minutes:

which software u r using?
Agilent Genesys2006 provides library for this transistor.
Just check.
lot varieties r there for this transistor in that software.

Hi!Sir:
I only found the datasheet(Pls see attached file) that IC have. In fact, I don't know what kinds of parameter I need when I simulate? Therefore, could u tell me what kinds of parameter that I need? BTW, my simualtion tool is Microwave office. Thanks ur help.

check this link
https://www.edaboard.com/ftopic69010.html
u can take help from the guy who posted this topic.
He has used the same transistor & has s parameter files
best of luck

Hello Jesterhsu,


It is very easy to even get the accurate Nonlinear Model in Microwave Office of the mentioned device...
Go to MWO Elements -> Nonlinear -> BJT -> choose GBJT device & then enter the spice parameters provided in the Device Datasheet Page No. 9...

Then Bias the model using your bias conditions (IC = 25 mA; VCE = 2 V.)then if it is matching the datasheet response...

Then use it in your LNA design schematic with Matching network...


Hope this solves your problem,....

---manju---

Hi Manjunatha_hv,
I follow your suggestion to key the conditions in the Microwave Office. But, the result is still wrong for me. Does some one could tell me how should I do?

Hello Jesterhsu,

Attached is the requested zip file having *.S2P file and the corresponding MWO project file *.emp & also you can download other s-parameter files from the folllowing link...

http://www.nxp.com/models/spicespar/data/BFG425W.html


I hope this helps...


---manju---

Hi! Manjunatha_hv,
Thanks for your help. I will try it. TKS.

Hi! Manjunatha_hv,
Could u tell me how ti import this device to MW? And why I can find the same prats as the reference file? The reference file will show what kinds of parts that I can't find. Does any possible I make any mistake that cause the different result? TKS.

I can only get from your post that
you want to impement this circuit in microwave office.
Is this you want?
I think the circuit you have shown is implemented in ADS.

you should use the DC Voltage Source available in Elements -> Sources -> DC -> DCVS

Regarding the other one it is just a termination port....
After seeing the ADS schematic which you posted...You need to use NL (spice) model instead os S-parameter file...

I just uploaded the updated MWO project file (*.emp)...complete the design according to your requirements...


---manju---

Hi Manjunatha_hv,
Thanks your so clearly expesssion. But the file that you attached I can't open it. My MO's version is 2002. Does it have any version issue? TKS.