I have searched far and wide to find a BF999 RF MOSFET model. I am presently using a very simple equation based model, but would like something more realistic. Any help would be appreciated.

 

Hello,

Have a look at this page:
http://www.infineon.com/search/de?q=bf999&sd=PRODUCTS
When you click on details and dokumente, you will get a pop-up with a zipfile containing simulation data.

Bertus

 

Bertus -
Thanks for the reply. I should have mentioned that I had already found that file - it contains a spice s parameter file. It is intended for higher frequencies than I am using in this case. I realize that the BF999 will have a higher noise figure at lower frequencies, but that does not matter for my application.
Bruce

 

Bertus -
Thanks for the reply. I should have mentioned that I had already found that file - it contains a spice s parameter file. It is intended for higher frequencies than I am using in this case. I realize that the BF999 will have a higher noise figure at lower frequencies, but that does not matter for my application.
Bruce

Why did you choose BF999 for your application, as opposed to another device?

 

I wanted a MOSFET to work up to 50MHz with low input and output capacitance. It also has ~20mS of transconductance.

 

I wanted a MOSFET to work up to 50MHz with low input and output capacitance. It also has ~20mS of transconductance.

It does look like a nice part. I doubt you will find a spice model. I remember seeing RF BJTs that had s-parameter specs. I couldn't find spice models for them.