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Power distribution networks (PDNs) delivering power to ICs in a system need to be thoroughly designed and analyzed in order to make sure any voltage fluctuation on the rail is within the tolerance of every IC connected to that rail. As ICs on the rail draw power, they generate a voltage fluctuation on the rail.
A common design technique for power distribution networks (PDN) is the determination of the peak distribution bus impedance that will assure that the voltage excursions on the power rail will be maintained within allowable limits, generally referred to as the target impedance. In theory, the allowable target impedance is determined by dividing the tolerable voltage excursion by the maximum change in load current.
Target impedance has become a standard tool when designing a power distribution network (PDN). It establishes a limit to the highest impedance the power rail on the die should see looking into the PDN. If the PDN impedance stays below this limit, even the worst-case transient current from the die will generate an acceptably low rail voltage noise.
This paper is a case study on causality problems in PDNs during power-aware SI simulations. It covers the causality of a PDN, and it reveals the impact on a design if a causality check is not done on the PDN for the package or board.
A negative coupling coefficient between decoupling capacitors is expected to result in lower inductance. While this is generally the case, this can also result in much higher PDN impedance.
EMI compliance is becoming a major concern for advanced power electronics due to increasing switching speeds. Correlated time-frequency measurements help optimize gate driving and minimize electromagnetic emission already during development. Download the app note to learn more.
Steve Sandler of Picotest and Heidi Barnes of Keysight teach this short course on Power Integrity at EDI CON USA 2016. This is part one of the session (~90 min). Site registration is required to view this course. View the on-demand session to discover more.
Visit our archived webinars page for educational resources on various design and measurement subjects and view at your convenience. Browse webinars here.
