Engineering Specification
ES-3U5T-1B257-AA
EMC Design Guide for Printed Circuit Boards
Frame 52 of 78
Rev. A
10/01/2002
Printed copies are uncontrolled
5.1. Board Structure/Ground Systems
1. When creating a schematic each component should have an appropriate reference
designator identifying it as a member of a specific functional group. This will assure
correct placement of components on PCB during layout.
A recommended arrangement of functional groups on PCB is shown in Figure 52.
All components should be placed with an appropriate functional group and their
tracks routed within their designated PCB area.
Figure 52. Arrangement of Functional Groups on PCB
2. Place ground plane(s) under all components and all their associated tracks - a
continuous ground plane with no avoidance in IC package or I/O connector area is
recommended. (Figure 53).
3. Maximize copper areas to provide low impedance for power supply decoupling -
careful arrangement of components and connections (traces) may allow large areas of
PCB to be filled with ground. Figure 53.
Figure 53. Maximizing Ground on PCB
Noisy
Digital
Analog
Power Supply
I/O (Connector)
Group 2
Group 3
Group 4
Group 5
Group 1
NO
YES
Summary :
All components should be placed with an appropriate functional group and their tracks routed within their designated PCB area. Maximizing Ground on PCB Noisy Digital Analog Power Supply I/O (Connector) Group 2 Group 3 Group 4 Group 5 Group 1 NO YES
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