Comparator Using Op-Amp

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OP-Amp as a comparator

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OP-Amp as a comparator
Op-Amp as Inverting Comparator
Op-Amp as Inverting Comparator

An operational amplifier as a comparator is a toggle circuit with defined voltage values at its output (specified by the operating voltage +Vcc and -Vcc) when a reference voltage Uref is reached or undercut. A general distinction is made between inverting and non-inverting comparators:

Op-Amp as Inverting Comparator

The reference voltage VRef is applied to the inverting input and Vin is applied to the non-inverting input as shown below. As soon as VI > VRef, the OPV switches to positive.

Non-inverting comparator circuit with OP-Amp

Non-inverting comparator circuit with OP-Amp

Op-Amp as Inverting Comparator

The reference voltage VRef is applied to the non-inverting input and Vin is applied to the inverting input as shown below. As soon as Vin > VRef, the OP-Amp switches to negative.

Op-Amp as Inverting Comparator

Op-Amp as Inverting Comparator