![]() Voltage comparators on the other hand, either use positive feedback or no feedback at all (open-loop mode) to switch its output between two saturated states, because in the open-loop mode the amplifiers voltage gain is basically equal to A VO. We have also seen that the standard operational amplifier is characterised by its open-loop gain A O and that its output voltage is given by the expression: V OUT = A O(V+ – V-) where V+ and V- correspond to the voltages at the non-inverting and the inverting terminals respectively. We have seen in previous tutorials that the operational amplifier can be used with negative feedback to control the magnitude of its output signal in the linear region performing a variety of different functions. In other words, the op-amp voltage comparator compares the magnitudes of two voltage inputs and determines which is the largest of the two. The Op-amp comparator compares one analogue voltage level with another analogue voltage level, or some preset reference voltage, V REF and produces an output signal based on this voltage comparison.
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