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Comparator offset polarity

Paul Toffolo
Prodigy 100 points

If I have a comparator with an actual Vio (input offset) of 2mv and the reference voltage supplied to one input pin is 10mv, when the other pin's voltage rises from ground past 10mv is there any way of predicting whether the ouput will transition at 8mv or 12mv?  Is the offset referenced from the inverting input, the non-inverting, or distributed by production processes to either input randomly?

 

Thanks much,

 

Paul

 

 

  • 0
    Genius 5430 points

    Paul;

    Comparator input offset voltage is just like the Vos on an op amp or an IA-- it is randomly distributed around zero. Manufacturers try to control their IC process to tighten this distribution as much as possible and skew the mean Vos to zero but perfection isn't possible. Data sheets show the "typical" Vos, which is the mean of a large number of samples, and the "maximum" which is the manufacturer's test limit-- anything outside of those limits are downgraded or scrapped.