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Diodes are used in comparator circuits primarily for their ability to control the direction of current flow and to clamp voltage levels. They can help define the thresholds for switching states, ensuring that the output responds accurately to the input signals. By preventing reverse current or limiting voltage spikes, diodes enhance the reliability and precision of the comparator's operation. Additionally, they can be used to create hysteresis, which helps stabilize the output against noise in the input signals.

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