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Power Tip #6: Accurately Measuring Power Supply Ripple

Power Tip #6: Accurately Measuring Power Supply Ripple. Improper Ripple Measurement Yield Poor Results. Full Scope Bandwidth Long Probe Lead Common Mode Pick-up. Four Simple Changes Drastically Improve Measurement. 20 MHz Scope Bandwidth Shortened Probe Lead Measure on Caps

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Power Tip #6: Accurately Measuring Power Supply Ripple

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  1. Power Tip #6: Accurately Measuring Power Supply Ripple

  2. Improper Ripple Measurement Yield Poor Results • Full Scope Bandwidth • Long Probe Lead • Common Mode Pick-up

  3. Four Simple Changes Drastically Improve Measurement • 20 MHz Scope Bandwidth • Shortened Probe Lead • Measure on Caps • Common Mode Filter on Probe Lead

  4. Ripple Usually Gets Better in the System • Interconnect Inductance • Wiring • Board Etch • Additional Load Capacitance • Effect Particular Apparent on Spikes • 15 nH & 10 uF Resonate at 400 kHz!

  5. For more Power Tips: Visit Power Management DesignLine and search: Power Tips http://www.eetimes.com/design/power-management-design Or click on the link to all articles in the description section of this video.

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