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Disclosed is a method for impedance matching for high-speed differential signaling. Benefits include improved signal quality and improved support for high-speed trace routing.
English (United States)
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Method for impedance matching for high-speed differential
Disclosed is a method for impedance matching for high-speed
differential signaling. Benefits include improved signal quality and improved
support for high-speed trace routing.
� � � � � Differential
signaling trace pair impedance must match the impedance of an external device
(see Figure 1). For example, an industry-standard differential coax cable as
differential impedance equal to 100 Ohm. The space between the traces (distance
S) must be large enough to match the impedance. Although this
requirement can be met, differential routing must occupy a larger routing area.
Moreover, the large space between two differential traces degrades the coupling
(see Figure 2) and damages the signal integrity. This problem is exacerbated as
products require more I/O traces and higher signal integrity.
� � � � � The disclosed method
handles the impedance matching problem for differential signaling by scratching
off a metal segment of the ground plane under the traces (see Figure 3). This
approach decreases the self-capacitance for both traces while the coupling
between traces remains approximately the same. The differential impedance can
be matched to a required number (for example, 100 Ohm) without enlarging the
space between traces, occupying silicon surface area.
� � � � � The disclosed routing
design enables more coupling than the conventional design (see Figures 4 and 2)
while both cases...