Generation of 1 mV pulse for calibration

[sagarpm]

I have to generate a 1 mV pulse for feeding as calibration signal to a data acquisition path. Generating higher level pulse ( like 1V) and attenuating using resistor network was giving lot of noise. Any suggestions on this. Pulse width is not significant, you can take it as 200 ms.

Sagar

 

[sagarpm]

Any help ?

 

[Fahmy]

What about using a capacitve potential divider?
but in this case you must asure that the caps are initially discharged when the circuit power-up.

 

[flatulent]

Something does not seem right. You should not get any noise from taking a high level signal and attenuating it.

I suggest that you track down the source of noise. Feed your circuit from an ordinary metal film resistor and see what types of noise you get.

In your divider, did you use the lowest resistance values that would not load down the original high level signal?


There is the possibility that your measurement system has a bandwidth that is much larger than you need. Do the calculations and limit the bandwidth as much as possible without damaging the signal you intend to measure.

 

[watersky]

I think 1mv pulse is too small that is flood by noise. perhaps a new calibration way need be study. Otherwise a active attenuation is necessary.