In this paper, we continue our discussion of the power distribution network or PDN. As discussed in the paper ‘Concepts of Power Integrity: Controlling Impedance across a Bare Cavity,’ a low-impedance PDN is critical for maintaining adequate current delivery to the receiver and, ultimately, for ensuring the proper performance of a printed circuit board (PCB).

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The examples in this paper shows how the addition of cavity elements, such as a voltage regulator module (VRM), decoupling capacitors, and stitching vias, influence the impedance of a cavity.

Ways to lower the impedance profile of the cavity at different frequency ranges

• Addition of a VRM

• Decoupling capacitors

• Stitching vias

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