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Layout For Engineers

An Introduction to Design Best-Practices

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Section 1
Placement

A – Principles of Placement

Requirements:
Mechanical
Size & Orientation
Spacing
Signal Orientation

What’s first?
What are the priorities?

B – Placement Review

STEP files
DXF – IDF options
ODB Placement Review

What and Why?
By Whom and How?

C – Constraint Manager

Physical Rules – defining Current Capacity
Differential Pair set up and definition
Single Ended Controlled Impedance
Via selection options
Kelvin Routing
Single Point Grounds

Which rules are appropriate for my board?

Section 2
Routing

A – Break-out Vias

B – Ground plane(s)

What are each of these?

C – Power Plane(s) – Creating a moat.

D – Differential pair routing.

Why and how to use them?

E – Power fills with multiple vias

F – Routing – Acid Traps – Minimum Spacing – Matched Lengths

Section 3
Documentation

A – Fabrication Notes

IPC-356 Net list requirement
“Shorts” Note
Copper weight

Minimizing Fab and Assembly Problems

B – Dimensions – minimum required

C ‐ Assembly Drawing

What does my company need?

D – Gerber Data

Silkscreen(s)

Questions