Hysteresis width of ST , power, frequency.

[Alex_Bam]

Hello.
I would like a better understanding regarding Schmitt-trigger. What I know is: the wider the hysteresis width is, the more it provides noise immunity.

But I am curious about the relationship between incoming signal frequency and the hysteresis width?
And also the relationship of power and hysteresis width?

Thanks.

 

[bertus]

Hello,

Have a look at the following pages:
https://en.wikipedia.org/wiki/Schmitt_trigger
https://components101.com/articles/schmitt-trigger-introduction-working-applications
http://hyperphysics.phy-astr.gsu.edu/hbase/Electronic/schmitt.html

Bertus

 

[Harald Kapp]

But I am curious about the relationship between incoming signal frequency and the hysteresis width?

There is no direct relation. As long as the Schmitt-Trigger circuit is fast enough to follow the input signal. But that applies to any logic circuit.

And also the relationship of power and hysteresis width?

None that I know of. It may depend on the specific construction of the Schmitt-Trigger input. A typical design uses positive feedback to create the Schmitt-Trigger effect. This feedback may contribute to power dissipation and this contribution may depend on the width of the hysteresis. But I repeat: it depends on the details of the design if and how much.