Fall time

Fall time

In electronics, fall time (pulse decay time) \scriptstyle t_f\, is the time required for the amplitude of a pulse to decrease (fall) from a specified value (usually 90 percent of the peak value exclusive of overshoot or undershoot) to another specified value (usually 10 percent of the maximum value exclusive of overshoot or undershoot). Limits on undershoot and oscillation (aka, ringing or hunting) may need to be specified when specifying fall time limits.

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