Positive feedback in a comparator

[AMSA84]

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

 

[KlausST]

Hi

It introduces hysteresis.

Klaus

 

[AMSA84]

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]

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

 

[AMSA84]

Okay. I will take a look. Maybe on razzavi's book.

Regards.