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Ripple and noise measurements with DC/DC switch-mode power supplies

Posted: 29 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:ripple and noise measurement? DC/DC SMPS? AnalogicTech application notes?

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 (SMPS). 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 switching noise). These measurement techniques are equally suitable to all SMPS DC/DC topologies, as well as charge pump (switched capacitor) regulators. Other techniques are recommended for the low noise levels typical found with non-switching LDOs. The measurement examples will focus on SMPS buck (step-down) low voltage regulators.

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