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Why does the amplifier become a hysteresis comparator after adding positive feedback?

March 11, 2021 by Zachary 1390

As shown in the figure, U2’s chip manual says operational amplifier

This is the meaning of amplifier, right

But after adding positive feedback, it becomes a hysteresis comparator

Does the amplifier become a comparator like this?

All Comments

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Isaac Posted on March 11, 2021

Don't be entangled with these superficial concepts. Comparators should be defined in terms of function, and are essentially amplifiers.

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Lucas Posted on March 11, 2021

Comparators and op amps can be regarded as one kind of things, but there are more limits. If the op amp is connected to a comparator, that is not a problem.

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Jackson Posted on March 11, 2021

In principle, the principle is similar. Compensation is omitted inside the comparator. Circuits such as analog bias are the comparators. The comparator requires speed, and the operational amplifier requires stability. The two can be interchanged if the requirements are not high. Generally, the comparator is OC output.


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