barefoot
Well-known member
I'm trying to come up with little group of components that can be used in place of a single bipolar transistor for added performance ? sort of a "super transistor" with high current gain, low input capacitance, low output impedance, etc. Flipping through my trusty Horowitz & Hill I found two techniques that look promising. First is a FET/bipolar combination in a Darlington type configuration (section 6.07). They discuss it as means of lowering a FET's output impedance, but I think it can just as easily be seen as a way to raise a bipolar's input impedance. Second is a FET cascode that exhibits very low dynamic input current (section 6.16).
Would a combination of these two techniques give me the super transistor I'm looking for? Am I wrong in thinking that this circuit can be used exactly like a single bipolar transistor with a very high beta and a gate-emitter voltage of about 0.6V?
Maybe some other combination would work better?
Thanks!
Thomas
Would a combination of these two techniques give me the super transistor I'm looking for? Am I wrong in thinking that this circuit can be used exactly like a single bipolar transistor with a very high beta and a gate-emitter voltage of about 0.6V?
Maybe some other combination would work better?
Thanks!
Thomas