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Help using self biased dual gate mosfet.

M

Mike

Jan 1, 1970
0
Someone has given me a mess of Infineon BF1005SR dual gate mosfets and
I would like to use them to build a broadband (500KHz to ???) active
antenna for my scanner and for experimenting with regenerative
detectors. The scanner covers 500KHz to 905MHz and I would like to
cover as much of that bandwidth as is practical.
I realize that the source must be kept at DC ground for the internal
bias to operate, and that I need to DC isolate the G1 input, and that
I can apply a variable 0-4v DC bias on G2 to vary the gain, but I'm
not sure what to do with the drain in order to get broadband gain.
Resistor and/or RF choke to +5v?
I have a telescoping whip antenna that I would like to use for input
and what about using a 2nd mosfet as a source follower on the output?
Data sheet can be found here.

http://www.infineon.com/upload/Document/cmc_upload/documents/010/2121/bf1005sseries.pdf

Any help would be greatly appreciated.

Mike
 
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