![]() Because relatively large currents are often involved, even small resistances in the power and ground shapes can cause significant power consumption (loss) and voltage drops.įigure 2 demonstrates an example of the problems that can arise if the resistance of the power and ground shapes are not properly considered. In general, we tend to assume that those power and ground shapes have 0Ω resistance, which isn’t necessarily true, and that assumption can cause problems. Note that all the loads are tied to the same power and ground shapes, and depend on those shapes to provide their operating voltage(s). As you would expect, the IR issues will increase in complexity with the number of loads on the supply through interaction in the power and ground copper paths.įigure 1: A basic block diagram of the power and ground shapes, and the applied loads.įigure 1 (above) shows a simple block diagram of a circuit's power source, and its power and ground shapes (traces and planes) that deliver power to the various loads (memory, microcontrollers, etc.). In essence, the PI-DC (or 'IR drop') problem is fairly straightforward: the resistance embodied in the board's power supply shapes (traces, polygons, planes etc) consumes power and voltage, robbing those from the various loads. – See information on the previous version of the PDN Analyzer (version 1.x) Power Integrity essentials The following information on this page provides an overview of the basic electrical and practical principles that apply to Power Integrity Analysis, and also includes installation and licensing information for PDN Analyzer v2.0.
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