Which device performs inversion on a digital signal?

Which device performs inversion on a digital signal?

• A. AND gate
• B. OR gate
• C. Buffer
• D. Inverter

Answer: (D)

In digital logic, inversion means producing the opposite logic level of a signal. The device that does this is the inverter, also known as a NOT gate. It takes a single input and outputs the opposite value: if the input is low (0), the output is high (1); if the input is high (1), the output is low (0). A buffer simply passes the input through unchanged, so it cannot invert. An AND gate outputs a high only when all inputs are high, and an OR gate outputs a high if any input is high; neither of these performs inversion. So the inverter is the element designed to flip the signal.

In digital logic, inversion means producing the opposite logic level of a signal. The device that does this is the inverter, also known as a NOT gate. It takes a single input and outputs the opposite value: if the input is low (0), the output is high (1); if the input is high (1), the output is low (0). A buffer simply passes the input through unchanged, so it cannot invert. An AND gate outputs a high only when all inputs are high, and an OR gate outputs a high if any input is high; neither of these performs inversion. So the inverter is the element designed to flip the signal.