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Disclosed is a circuit geometry which allows the ground pads on a tightly spaced EC (engineering change) plane designed to accept twisted pair wires to be connected with a grid of printed circuitry.
English (United States)
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Alternating Signal Pad EC Plane
Disclosed is a circuit geometry which allows the ground pads on a tightly
spaced EC (engineering change) plane designed to accept twisted pair wires to
be connected with a grid of printed circuitry.
Because of the limited amount of space available in some high density
applications, it is impossible to connect the ground pads on the external EC
plane in a "grid" type fashion with printed circuitry of conventional design as
shown in Fig. 1. By rotating alternate signal pad circuits 180 degrees about their
PTH's (plated through holes) as illustrated in Fig. 2, the ground pads may be
connected by a "grid" of printed circuitry rather than only by "lines" of printed
circuitry as shown in Fig. 1. This results in a lower resistance ground plane and
makes the design of a generic (independent of component size and placement)
EC plane possible: the lines of ground pads in the conventional design have to
be connected to a unique commoning network which can only be located in a
PTH free area.