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Considerations for Proper Layout of a High-Speed PCB

A review of the signal integrity demands of digital and analog components.

An endless variety of software tools exist to ensure signal integrity at the board level. The critical tool, however, is careful evaluation of considerations to maintain PCB signal integrity.

Take the power supply, for example. A misstep or two here can have adverse effects on the board, and subsequent problems when that design undergoes EMC compliance. If digital high-speed signals aren’t correctly routed, they can cause jitter or, worse, a device’s complete malfunction. Analog devices, especially those with low-end amplitude analog signals, pose another problematic scenario. Those signals are extremely prone to noise. If digital noise seeps into them from the planar capacitance located between digital and analog planes, those analog devices won’t function properly.

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