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  1. #1
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    How to modify hysteresis of cross coupled comparator

    Hi

    I want to design a comparator with varying hysteresis. What are the important parameters that should be considered while setting hysteresis? How can the hysteresis be modified?

    Thanks
    Rati

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  2. #2
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    Re: How to modify hysteresis of cross coupled comparator

    this explains how hysteresis works and why it is used
    while the discussion uses specific devices, the ideas apply to any comparator

    https://www.maximintegrated.com/en/a...ex.mvp/id/3616

    i'm an old fan of national semiconductor application notes
    i have always found them useful
    (these days they are hidden behind ti)

    http://www.mpu51.com/mcucity/appnote...ion%20note.pdf

    you can change the hysteresis by changing the value of the positive feedback resistor
    one way to do that is to put a FET across the resistor
    as you turn the FET on through its linear region, the net resistance decreases
    the resistor is the maximum resistance while the fully on FET represents the lowest resistance.

    what do you mean by a cross coupled compactor?


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  3. #3
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    Re: How to modify hysteresis of cross coupled comparator

    the hysteresis is a voltage-band defined in op-amp comparators which determines the output level based on the non-inverting input. if you won't to use hysteresis, the output will go to chattering and will be unstable. because the input is always under changes and noises.
    Hope is a good thing, maybe the best of things and no good thing ever dies (The Shawshank Redemption).



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