How to calculate hysteresis of non inverting opamp

MrAl

Joined Jun 17, 2014
11,474
The two equations solve the problem completely:

VinL=(Vref*R2+Vref*R1-VoH*R1)/R2
VinH=(Vref*R2+Vref*R1-VoL*R1)/R2

VinL is the input low threshold point,
VinH is the high input threshold point,
VoH is the output of the comparator when it has logical high output,
VoL is the output of the comparator when it has a logical low output,
Vref is the reference voltage,
R1 is the input resistor,
R2 is the feedback resistor.

Subtracting one expression from the other we get the total hysteresis:
(VoH-VoL)*R1/R2
 
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