Is there a "repeater" logic gate?

by Aaron Franke   Last Updated September 11, 2019 16:25 PM - source

What I want to create is a simple logic gate that doesn't actually perform any logic, but instead simply repeats the given signal. I want to do this so that I can have a one-way wire.

Some ideas that I've thought of, but I'm not sure if they're efficient, or which one is more efficient:

  • A NOT gate plugged into a NOT gate.

  • An AND gate with both of the inputs as the same wire

  • An OR gate with both of the inputs as the same wire.



Answers 2


What you're looking for is commonly known as a "buffer". Any of your proposed constructions would work to form one; I believe the two-cascaded-NOT-gates is common in CMOS logic.

Hearth
Hearth
September 11, 2019 16:10 PM

Buffers are another option, but really "one way" is the default of logic signals. You do have exceptions where tri-state gate outputs are connected together, wired "OR" and perhaps some other exceptions.

The buffer or non-inverting gate construct will delay the signal by a bit and might provide stronger drive, which are useful in some circumstances. Sometimes you want true and complementary outputs that change at almost the same time, such as this one.

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Spehro Pefhany
Spehro Pefhany
September 11, 2019 16:13 PM

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