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Comparator with unilateral hysteresis

Comparator with unilateral hysteresis
Normally, a comparator has inherent hysteresis, that is, when the Input voltage rises, the comparator will react only when the reference voltage is exceeded by a certain amount. When the inputvoltage drops, the comparator changes state only when that voltage is weIl below the reference potential. Hysteresis is essential to prevent a system clattertng or vibrating around its reference Ievel.
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