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Section 5 High Speed PCB Layout Techniques (第五节高速PCB布局的技巧)
High Speed Analog Design and Application Seminar
Section 5
High Speed PCB Layout Techniques
Scenario: You have spent several days, no maybe weeks, perfecting a
design on paper and also using Spice to ensure the design exceeds all
expectations. You hand the schematic to your layout person who puts all
everything on a printed circuit board (PCB). The PCB comes back in a week
or two and is finally populated and ready to test. But it doesn’t work!!!!
Why not? On paper it works!! Spice said it works!! But it doesn’t work!!
This scenario happens more often than not and the reason many circuits do
not work as expected is due primarily to the PCB layout.
This section looks at some key fundamentals of high speed PCB layout
techniques so that hopefully the above scenario will never happen to you.
5-1
Texas Instruments
High Speed Analog Design and Application Seminar
PCB Components
Component: Copper Traces
Purpose: Interconnect two or more points
Problem: Inductance and Capacitance
⎛ 5.98 h ⎞
ε w L(nH) ≈ 2x ln ⎜ ⎟
r ⎝0.8 w + t ⎠
t
h 0.264x (εr + 1.41 )
C(pF) ≈
⎛ 5.98 h ⎞
x = length of trace (cm) ln ⎜ ⎟
w = width of trace (cm)
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