Logic circuits

Which correctly describes what a NOT gate (inverter) does?

  1. AIt outputs the sum of two inputs
  2. BIt outputs the input unchanged
  3. CIt inverts the input, turning 0 into 1 and 1 into 0
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Answer: C. It inverts the input, turning 0 into 1 and 1 into 0

A NOT gate inverts its input, outputting 1 for an input of 0 and 0 for an input of 1. In CMOS it is implemented as an inverter made of one nMOS and one pMOS transistor and is the most basic building block of logic circuits.

  • A. Gates that take two inputs are 2-input gates such as AND and OR.
  • B. Passing the input through unchanged is a buffer.
  • C. Correct. It inverts 0 and 1.
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