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Amplifier analysis question

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duckless

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I'm currently studying for an exam where we have to do small/large signal analysis. I know that gm is the mutual conductance and that re is the reciprocal of gm but how do I calculate re when I dont know what gm is? Ive been looking at various examples and it always seems to be re=25mV/Ie. Is this always the case?
 
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I'm currently studying for an exam where we have to do small/large signal analysis. I know that gm is the mutual conductance and that re is the reciprocal of gm but how do I calculate re when I dont know what gm is? Ive been looking at various examples and it always seems to be re=25mV/Ie. Is this always the case?

hi,
Its a low current 'constant', look at this link.:)

**broken link removed**
 
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