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Ripple and Noise MeasurementsApplication Note Ripple and Noise Measurements with DC/DC Switch-Mode Power Supplies
As switching frequency and switching speeds continue to increase, special care should be taken to ensure accurate measurement of input and output voltage ripple in switch mode DC/DC power supplies (SMPSs). There is no industry standard to measure ripple and noise in DC/DC converters. Test set-up and methodologies vary from vendor to vendor, which can cause significant confusion. The techniques described in this application note provide reproducible results and require no special laboratory set-up beyond a high frequency voltage probe and oscilloscope. This application note will summarize the set-up, methodology, and practical measurement guidelines to accurately measure input and output voltage ripple (or
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