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Carsten Milkau/NOT Gate

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Revision as of 12:49, 19 July 2018 by Carsten Milkau (talk | contribs) (Created page with "= NOT Gate = A NOT gate, sometimes also called ''inverter'', is a circuit that outputs the value that was not input. It has a single input and output, and each can only take...")
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NOT Gate

A NOT gate, sometimes also called inverter, is a circuit that outputs the value that was not input. It has a single input and output, and each can only take one of two pre-defined values (typically 0 and 1). Whatever the input value is selected, the output value will be the other of the two.

Definition

value table
input output
0 1
1 0

Connectors

  • Input: one of two values (0 or 1)
  • Output: the other of the two values

Implementation

NOT gates can often be avoided by modifying the circuit. For instance, if you use the output of a NOT gate to control the selector input of a Logic Select Unit, you can just switch the two inputs with each other instead and eleminate the NOT gate.

Unfortunately, there is no single-component implementation of a NOT gate. However, if you happen to have a data signal with a known value (like a memory containing a constant), often you can feed this signal into a single component in order to turn it into a NOT gate.

Using A Less-Than Comparator

Using An Equality Comparator

Using Subtraction