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detect if a pulse train has an irregular pulse intervals

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pankaj jha

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Hi
I have a pulse train. I have to detect whether the pulses are coming at regular intervals or irregular intervals (just yes or no).

Can anyone suggest a simple analog circuit based solution for the same??
 

betwixt

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It depends on how big the pulses are and the maximimum/minimum intervals between them. Probably the simplest method would be a PLL, you can use the lock detection to see if the frequency has shifted.

Brian.
 

d123

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Hi.

The 555 timer can be configured as a missing pulse detector, it appears in quite a few of the datasheets in the "typical applications" section.
 

chuckey

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The spec. is a bit vague. Are you talking about a constant width pulse but with irregular spaces between them? A constant on/off period for the pulses but of different repetition rate. Or the inverse of the first one, constant space , variable ones. Or pulses just missing in a constant pulse train. Also what sort of errors? .01% of the pulses missing ?, 30%?
Frank
 

SunnySkyguy

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Start with specs.
Normal pulse interval range.
Abnormal interval min/max

Then use dual precision one-shot IC to detect missing or extra pulses with 2 circuits.
Setup pulse on each one shot for min & max tolerance.
If pulse input occurs during active state of non-retriggerable 1shot for MIN pulse interval then "extra pulse." from AND function
Use retrigerable 1shot for MAX interval and if it times out then " missing pulse"
 

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