Post subject: Dual-Gate MOSFET Posted: Sat Nov 11, 2006 9:32
Joined: Thu Aug 10, 2006 7:09 pm
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
Joined: Mon Jun 27, 2005 2:02 pm
This looks like a good idea.
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?
Posted: Thu May 03, 2007 5:17 am
May 03, 2007 2:55 am
yeah RF switch
will give good performance ,
also check NXP they produce some MOSFETS
and Switches for RF