fallTime(a,margin)

Determines the fall time of an arbitrary signal

Syntax

o_fallTime(a,margin)

a: waveform - signal to be analyzed

margin: scalar numeric - margin to be used for fall time, in percent

return: scalar Real- fall time of signal

Usage

One common parameter for digital signals (pulses, square waves, etc.) is fall time. Fall time is the transition time from a lower extreme to an upper extreme. This is commonly defined as 10-90 time (time from 10% of the full transition to 90%) or 20-80 fall time. This function takes an arbitrary signal and analyzes it to determine the average fall time. The input margin is used to define both the upper and lower transition limits. Hence margin=10 is the same as 10-90 fall time.

Location

menu: veeos ==> Signal Processing ==> fallTime

library: sigLib

Example

Notes

This function is very general in nature so any signal may be used. It finds all applicable transitions in the given signal and then averages them to give an estimate of the signal's fall time. Note that it does not treat any particular fall time as more important than any other so if you are looking for transitions in very noisy signals you may want to examine the signal differently. Since margin can be specified you are free to define fall as you like.

Reference

Dependencies

Supported On

VEE 7.0+, all platforms

See Also

dutyCycle, frequency, period, riseTime,