How to figure out cutoff frequency using scope for LC filter post SMPS

Thread Starter

witssq

Joined Mar 29, 2009
48
I am using commercial SMPS +5, +/-5V output.

Against SMPS output, I applied LC filter, and achieved 45mV noise down to 20mV noise, but I need about 5mV or below.

Please anyone help me about how to find cutoff frequency not easy to figure out

The microscopic view is after currently filtered.


Best regards,
SunSung
 

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