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Positive feedback in a comparator

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AMSA84

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Why the positive feedback of a cross-couple comparator has a value of -1/gm? How to get there?
 

KlausST

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Hi

It introduces hysteresis.

Klaus
 

AMSA84

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How can I get to the -1/gm value? Evaluating the small-signal equivalent circuit. But how? How this term comes to this value of -1/gm?
 

BigBoss

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It can be found easily from its small signal equivalent circuit.( hint: cross coupled transistor oscillators )
 
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    AMSA84

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