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Comparator and Schmitt Trigger

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calculus_cuthbert

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comparator and schmitt trigger differences

Hi,

I am designing a CMOS comparator with hysteresis. I had a basic question. What is the difference between a Schmitt trigger circuit and a comparator with hysteresis? Are they the same? Could someone please help me out?

Also how do I decide on an architecture for a comparator with hysteresis?

Thank you.
 

op amp schmitt trigger

It is the same. Unless - A schmitt trigger could be designed otherwise too.
 

comparison between schmitt trigger & comparator

what do you mean by 'designed otherwise'? could you also suggest how to choose an architecture ?
 

It is the same.
Click to expand...
Looking at real parts reveals important differences.

ST's are digital circuits with rather large threshold tolerances, consult e.g. a 74HC14 datasheet.

Comparators are analog parts with usually tight specifications. Hyteresis is in a few mV up to several 10 mV range. And they have differential inputs.
 

lets get clearity:
Comparator compairs two signals voltage /curent and gives logical output. no built in hysteresis, can be added by feedback elements. refrence is still available.
Schmitt trigger : has inbuilt hyterisis , the refrence is set inside by design.
finally opamp can be used as comparator, but not vis-a-versa. design an op-amp and use it like comarator is sign of bad designer.
 

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