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Splitting Planes For Speed and Power:Designers are sometimes confused about the question of how to deal with multiple power planes on printed circuit
boards, and how to deal with their separation. We often talk
about the horizontal separation between planes as a “split” and
there are some design rules that may apply when designing in
the area of splits.
But before we talk about how to deal with splits between
planes, it is instructive to talk about why we have separate
power planes in the first place – to accommodate separate
power supplies. And one reason we might have separate
power supplies is because we might have different voltages in
our circuits. So the issue of separate voltages might be a reasonable
place to start.
boards, and how to deal with their separation. We often talk
about the horizontal separation between planes as a “split” and
there are some design rules that may apply when designing in
the area of splits.
But before we talk about how to deal with splits between
planes, it is instructive to talk about why we have separate
power planes in the first place – to accommodate separate
power supplies. And one reason we might have separate
power supplies is because we might have different voltages in
our circuits. So the issue of separate voltages might be a reasonable
place to start.
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