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Message: <blockquote data-quote="Murat" data-source="post: 739824">In the comparator circuit below, when we select the operational amplifier as "rail to rail input" type, the reference voltage falling on the non-inverting pin is a square wave.Why do we see a square wave on the non-inverting pin?What are the differences between "Rail to rail input", "Rail to rail output" and "Rail to rail input/output" operational amplifiers?<a href="https://i.sstatic.net/1975at3L.png"><img src="https://i.sstatic.net/1975at3L.png" alt="enter image description here" class="fr-fic fr-dii fr-draggable " style="" /></a></blockquote>