This article turns Comparators, Hysteresis,
and Schmitt trigger into a piece of cake.
Promise..
The above circuit is the famous comparator with positive feedback diagram, (Known as HYSTERESIS).
The logical sequence for anyone new to hysteresis is: What, Why, and then How. And that’s exactly what we are going to do now.
What is Hysteresis?
A comparator circuit has two inputs. It compares them and produces one output that shows which input is higher. We apply the input voltage V1 to the inverting input (IN-) and a reference voltage Vref to the non-inverting input (IN+). The comparator compares them:
If Vref is higher than V1, the output Vout goes to Vs+ (high).
If V1 is higher than Vref, the output Vout goes to Vs- (low).
In this simple case, Vref is a single, constant threshold. It makes the output give an ON signal while V1 is still below the threshold, and it makes the output give an OFF signal the moment V1 reaches the threshold.
Why do we make Hysteresis?
Leave a Reply