bf996

Hello,

I am attempting to design a UHF mixer based on the BF996 mosfet from NXP semiconductors. RF =450.325MHz, Lo=471.725MHz, Output = 21.4MHz

1. Does anyone know where I can find a spice model for this mosfet at it does not appear on the NXP website. (I do have the S parameter model)

2. I have downloaded and installed the NXP designkit for ADS. I believe I could use the Mosfet Model 11 to simulate the non linear BF996 but I require Length L and Width W of the channel region of the mosfet to do this. Where on Earth could I possibly find this information without specialised equipment?

3. I was hoping to use a mosfet, as square law mixers unwanted outputs are more easily removed than a single BJT mixers output. The BF996 it is at the right frequency, is a long channel device. Regardless does anyone have any other recomendations for a active single device mixer?

Thanks I really appreciate the help

You can try to use BF998 instead BF996:
http://www.nxp.com/models/spicespar/data/BF998.html

I have looked at the BF998, unfortunately it is a short channel device. Apparently long channel devices make better mixers than short channel ones.

Cheers