PCB叠层设计
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PCB疊層設計介紹
Agenda Background Knowledge Transmission Line Theory PCBCross-sectionintroduction PCB Material and CopperThickness PCB Layer Stack-up Design Flow
●Design conditions and Target
●Material / Copper selection
●Define other parameters
●Impedance calculation
BackgroundKnowledge(1/3)
BackgroundKnowledge (2/3) PCB Design and Profitability
–From Lee Ritchey’s “Right the FirstTime”(Vol.I)
BackgroundKnowledge(3/3) Why and How to define the trace width?
Transmission Line Theory Transmission Line
–A transmission line is composed of any two conductors that have length •Signal Path and Return Path
–Any circuit length at least 1/10th of the edge rate must be considered as a transmission line
Transmission Line ElectromagneticProperties
Equivalent Circuit Model
–Characteristic Impedance
–Propagation Equation (Time Delay)
Transmission Line
●Transmission Line Structure –Microstrip（微帶線）
–Stripline （帶狀線）
Transmission Line
●Reflection and Transmission
–Reflection Coefficient
–Transmission Coefficient
PCB Cross-section introduction
PCB Material Thickness Copper Clad Laminate(CCL)---CORE
–Thickness (mil): 3, 4, 5, 6, 8, 10, 12, 14, 15, 18, 20, 21, 24, 31, 32, 39, 44, 47, 59, 62
•<31mil, without Cu;
•≥31mil, with Cu.
PCB Material Thickness
Copper
PCB Layer Stack-up Design Flow
Design Flow
-Design conditions and Target -
●Design conditions
–Board size
–Board layers
–Total Thickness
●Design Target
–Enough routing space and crosstalk margin
–Meet target impedance
–Meet PI requirement
–Meet DFM rules
–Meet high speed signals IS requirement ●Prepreg / Core Selection
–Impact trace width
–Impact impedance
–Tg requirement
–Insertion loss requirement
–PCB cost
●Copper selection
–Power integrity
–PCB cost
Define the other parameters
–Meet DFM rules
–Symmetric construction
–Total thickness
Design Flow
-Define other parameters -
Impedance Calculation(Single) Design Flow -Impedance Calculation
W1 ≥?mil
W2 = ? mil
H2 ≥3H1 + T1
Impedance Calculation(Differential)
W1 ≥?mil
W2 = ? mil
H2 ≥3H1 + T1
Impedance Calculation(Other constructions) Design Flow
-Impedance Calculation -
Q&A