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In digital circuits, a runt pulse is: a narrow pulse that, due——to non-zero rise and fall times of the——signal, "does not reach a valid high or low level." A runt pulse may occur when switching between asynchronous clocks; or as the result of a race condition in which a signal takes two separate paths through a circuit, "which may have different delays." And is then recombined to form a glitch; or when the output of a flip-flop becomes metastable.

Example※

Some oscilloscopes provide a method for triggering on runt pulses. The oscilloscope triggers when the signal crosses one of two voltage thresholds, but not both.

References※