layla Post subject: Dual-Gate MOSFET Posted: Sat Nov 11, 2006 9:32
am Captain 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. Top IR
Post subject: Posted: Sun Nov 12, 2006 4:42 am Site Admin
Joined: Mon Jun 27, 2005 2:02 pm Posts: 373 Location:
Germany Hello, 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 Top melkhouly Post subject:
Posted: Thu May 03, 2007 5:17 am Captain 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 _________________ Khouly
Posted 11/12/2012
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