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Hi!
when you draw the equivalent ac circuit of a common collector then calculate the value of Zo=vout/iout you find that Zo=r'e
to read the details you can check malvino's book or any book which can be used as a teaching book
if this is what you mean and need more details kindly inform me
Does this mean that r'e has a very small value...? Isnt it that output current in common collector configuration is the emmiter current... and as the input current is the base current, so when we give an input test voltage in the output side the emmiter current in the output circuit is converted into base current in the input circuit... so this makes the input side resistances to be divided by a factor of beta+1... isnt this fact that contributes to the low output resistance of the common colector configuration...
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