Runt pulse

Runt pulse

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.cite web
publisher=Tektronix
title=Oscilloscope triggering
url=http://www.tek.com/Measurement/cgi-bin/framed.pl?Document=/Measurement/scopes/selection/trigger.html&FrameSet=oscilloscopes
]

cite web
publisher=Tektronix
title=Diagram of a runt pulse
url=http://www.tek.com/Measurement/scopes/selection/graphics/t5.gif

References


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