Maker Pro
Maker Pro

Help using self biased dual gate mosfet.



Jan 1, 1970
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.

Any help would be greatly appreciated.