AWG G3 PAD FOR PS3 Spezifikationen Seite 129

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DUT Board Design for Mixed-Signal Tests 5 DUT Board Performance Considerations
System Reference, January 2001
129
Printed Circuit Board
To run the same application on multiple testers for
production tests, the DUT board is developed as a printed
circuit board (PCB).
As the operation rate of a mixed-signal device increases,
application engineers who develop test circuits need to be
skilled not only in schematic design but also in printed
circuit board design. This is because traces on the PCB at
high frequency generate physical effects (reflection,
crosstalk, and so on) that are not represented in the sche-
matic.
Characteristic Impedance According to the transmission line theory, if the character-
istic impedance of a trace does not match the termination
impedance and if a high-frequency signal is transmitted in
the line, a reflection will occur for the signal. To measure a
high-frequency signal accurately or to force a high-
frequency signal accurately, the transmission line must be
designed to match the termination impedance.
Hence, a microstrip line and strip line are used because
their impedance can be controlled by changing the thick-
ness, width, and height above the ground plane.
The following figure shows the model of a microstrip line:
Figure51 Microstrip Line Model
W
h
Ground Plane
t
Dielectric
Characteristic Impedance:
Zo =
Er+ 1.41
87
0.8*w + t
5.98*h
ln
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