Op amp comparator circuit: Operational amplifier tutorial
The op amp comparator circuit uses an operational amplifier to compare 2 voltages at it’s inverting an non inverting inputs. If the voltage at the non inverting input is higher than the inverting input, then the output will be as close to the positive supply as possible. However, if the non inverting input is a lower voltage than the inverting input, then the output will be as close to the negative power supply as possible.
- Non inverting comparator – When the signal voltage is applied to the non inverting pin, while the reference voltage that it is being compared to, is at the inverting pin.
- Inverting comparator – When the signal is being applied to the inverting pin, while the reference voltage that it is being compared to, is at the non inverting pin.
- Open loop mode – No positive feedback is used. Output does it’s best to change right where the signal voltage crosses the reference voltage. This is taking advantage of the op amp’s high gain.The voltage difference of the 2 inputs is amplified many times (limited by the output’s maximum voltage).
- Schmitt trigger – Some of the output voltage is fed to the non inverting input. Thus, pulling the non inverting voltage up or down a tiny bit. Every time the output changes states, it takes more signal voltage change to get to the reference voltage again. Additionally, the output is more decisive.
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Non inverting op amp comparator
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