detect if a pulse train has an irregular pulse intervals

Status
Not open for further replies.
P

pankaj jha

Full Member level 3
Joined
Apr 16, 2010
Messages
170
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,298
Location
jaipur
Activity points
2,457
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??
 

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.
 

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.
 

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
 

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"
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…