At 08:44 PM 6/17/2011, you wrote:
>Hey all,
>
>What is this minimum impedance and why is it there?

The transistor saturates and Vce become more-or-less constant, decreasing
slowly with decreasing collector current, given the constant base current.
That's what's happening.

I don't think that viewing it as an "impedance" (ratio of v/i) is
particularly helpful to gaining understanding in this kind of situation.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the rewar=
d"
speff@interlog.com             Info for manufacturers: http://www.trexon.co=
m
Embedded software/hardware/analog  Info for designers:  http://www.speff.co=
m



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