Comparator

The extremely large open-loop gain of an op-amp makes it an extremely sensitive device for comparing its input with zero. For practival purposes, if

the output is driven to the positive supply voltage and if

it is driven to the negative supply voltage. The switching time for - to + is limited by the slew rate of the op-amp.

Applications
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Summing amplifier
Difference amplifier
Comparator
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Comparator Applications

The basic comparator will swing its output to at the slightest difference between its inputs. But there are many variations where the output is designed to switch between two other voltage values. Also, the input may be tailored to make a comparison to an input voltage other than zero.
Zener-controlled output switching
Comparison to a standard voltage
Schmitt trigger
Square-wave generator
(astable multivibrator)
Analog-to-digital converter
Ground fault interrupter
Difference amplifierAmplified difference
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Electronics concepts

Op-amp concepts
 
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