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3.4.2.5 Elimination of Power Plane
If the power plane is eliminated or extensively slotted to accommodate routed traces, decoupling and
power distribution becomes more critical. The key is to maintain a low inductance connection from “hot”
package power pins to a decoupling capacitor. Also, keep the inductance between widely separated parts
of the power net as low as possible. Gridding the net in a cross connect pattern will lower inductance
between points, as will wider traces. The procedure is to use a grid and then use wide traces from grid
intersections to the decoupling capacitors or packages.
Figure 3-7. Power Distribution Grid
Wide
Trace
Decoupling
Capacitor
VDD
18
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to VSS
(GND)
Core Design and Components