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Dual-Gate MOSFET - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement

Post subject: Dual-Gate MOSFET Posted: Sat Nov 11, 2006 9:32 am


Joined: Thu Aug 10, 2006 7:09 pm
Posts: 7
Hello everyone. I was wondering if you can help me set up a simple circuit to utilize the BF988 dual-gate MOSFET as a switch to pass on (or prevent the passing of) a 315MHz sine signal. I was thinking of inputting the 315 MHz signal into one gate and the control (ON/OFF) signal into the other gate. Would that work. Your advice and suggestions would be greatly appreciated. Thanks.


Post subject: Posted: Sun Nov 12, 2006 4:42 am

Site Admin

Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany

This looks like a good idea.

You should assure that the level of the control signal is much higher than the 315MHz RF signal. Looking at the curve of Gain vs Vgs1 voltage in page 5 of the data sheet, shows how much the signal would be amplified or attenuated. The gain response over the Vgs1 voltage variation looks flat with some peaks.

I would however also consider another circuit: Why not using an RF switch?

Best regards,

- IR


Post subject: Posted: Thu May 03, 2007 5:17 am


Joined: Thu May 03, 2007 2:55 am
Posts: 8
Location: Egypt
yeah RF switch will give good performance ,
also check NXP they produce some MOSFETS and Switches for RF


Posted  11/12/2012

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