In Part 1: Principles of Current Flow, we began with the basics. We learned that high-frequency signals flow not in the path of least resistance, but in the path of least impedance. We also discussed some fundamental principles of current flow in PCBs with ground planes.

In Part 2: Design to Minimize Signal-Path Crosstalk, we applied those principles to real-world circuits and to the PCB layout of these circuits. We learned how to place components and route signal traces to minimize problems with crosstalk.

In this final Part 3 we consider the power source currents and how to apply what we have learned to circuits with multiple mixed-signal ICs. We finish with an example where a ground plane cut is useful.

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