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Help using self biased dual gate mosfet.

Discussion in 'Electronic Basics' started by Mike, Jan 1, 2006.

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  1. Mike

    Mike Guest

    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.

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