Which operational amplifier configuration is commonly used in zero crossing detectors?
Comparator configuration without feedback is used.
A zero crossing detector compares the input against 0 V and switches its output each time the input crosses zero.
This needs an open-loop comparator configuration (no feedback), where the op-amp's very high open-loop gain drives the output to saturation for the smallest polarity change of the input.
Hence, a comparator configuration without feedback is used.
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