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The Designer's Guide Community Forum › Design › Analog Design › How to figure out cutoff frequency using scope for LC filter post SMPS
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How to figure out cutoff frequency using scope for LC filter post SMPS (Read 1059 times)
witssq
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How to figure out cutoff frequency using scope for LC filter post SMPS
Mar 19th, 2011, 11:30pm  
I am using commercial SMPS +5, +/-15V 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,
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