Noise suppression circuit

Murugesh_89 · Feb 4, 2013

Hi,
I am detecting a square wave with the off time varies from 0.08 milli seconds to 1 milli seconds with the corresponding on time 1.92 ms and 24 ms respectively.
I am getting some spikes(low to high) within the off time.
The number of spikes is not a constant. How do i eliminate those unwanted spikes by doing changes in hardware?

Thanks,
Murugesh

babar_ali · Feb 4, 2013

Hi,

I have encountered such situation before by using a Schmit trigger and an OPAMP comparator circuit. I will guide you when you post the snap of the noise you seen in the oscilloscope.

enjoy!

Murugesh_89 · Feb 4, 2013

Hi,
Below the snap short of noise...

I get some multiple pulses due to this noises..

YanivS · Feb 4, 2013

Have you considered placing a small capacitor on the line? It depends on the spikes but for the time periods you have mentioned it looks as if a 100pF capacitor to the ground will do the job.

babar_ali · Feb 4, 2013

Hi,

Can you post the Schematics that produces such type of pulses. Also post the power schematics. Have to tried to Pull UP the line via some resistance (typically 2.2k to 4.7k).

Noise suppression circuit

Murugesh_89

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Noise suppression circuit

Murugesh_89

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