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Problem with bootstrapped emitter follower!

Discussion in 'Electronic Basics' started by icus, Jun 29, 2004.

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  1. icus

    icus Guest

    Hi, I'm studing the bootstrapped emitter follower amplifier, but I don't
    understand how Zi is given by Zi = Rboot/( 1 - A ), where A is the gain.

    In my book the explanation of this formula is this:

    An input wiggle of vin result in an emitter wiggle ve +-= vi ( sorry for
    the +-= I don't know how to write that the two quantity aren't perfectly
    equal :) ).

    So i = (vin - ve )/Rboot +-= 0, i.e Zin = vin/Iin = infinity.

    Why in this analysis ib ( the current that through the transistor ) is
    omitted?

    Thank for your help!
     
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