PHYSICAL DESIGN AND DEBUGGING
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~ I Oecoupling
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231732i11-2
Figure 11-2. Typical Power and Ground Trace Layout for Double-Layer Boards
or other boards in a multi-board system. It is necessary to match the supply's impedance to that of the components in order to-lessen the potential for voltage drops that can be caused by Ie edge rates, ground- or signal-level shifting, or noise induced currents or voltage reflections.
A mismatch can be minimized by using a suitable high-frequency capacitor for bulk decoupling of major circuitry sections, or for decoupling entire pc boards in multi-board
11-5
