What you are describing, Al, is basically an IGBT (Insulated-Gate
Bipolar Transistor). Harold's reply is true, but there are definitely
some uses for these devices. Try googling IGBT.

Sean


On Sun, May 8, 2011 at 5:07 PM, Al Shinn <alshinn@mindspring.com> wrote:
> If a FET is connected from the collector to base of a bjt(like a
> Darlington but with a FET for the "top" transistor), can the bjt
> transistor achieve saturation specs? Apropos of the OP's desire for a
> variable load for a battery tester.
> --
>
> Looking forward,
> Al Shinn
>
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