Infographics: Digital Logic Gates

 A logic gate is a basic building block of a digital circuit, which is used to implement a Boolean function. It executes a logic operation on one or more logic inputs and generates a single logic output. Logic gates are mostly implemented using electronic switches like diodes or transistors, but can also be built using electromagnetic relays, vacuum tubes, fluidic logic, optics, molecules, pneumatic logic, etc.

In computers or control units, a large number of electronic circuits are made up of logic gates. These processes signals are denoted by T (True) or F (False). Logic gates are mainly used in some devices like microprocessors, embedded systems, microcontrollers, registers, ALUs, MUX and also in computer memory; there are more than 100 million gates especially in microprocessors. But, in practice, most of the logic gates are made with CMOS technology, FETS and MOSFET.

The basic logic gates are classified into seven types: AND gate, OR gate, XOR gate, NAND gate, NOR gate, XNOR gate and NOT gate. Truth table is used to show logic gate function. All the logic gates have two inputs except the NOT gate, which has only one input. When drawing a truth table, the binary values 0 and 1 are used. Every possible combination depends on the number of inputs. If you don’t know about the logic gates and their truth tables and need guidance on them, please go through the following infographic that gives an overview of logic gates with their symbols and truth tables.

Different types of digital logic gates


  1. Arun Sengupta says:

    Pretty nice and very helpful 🙂
    I wish I had this option when I was in school or engineering 😛
    But great job guys 🙂

    1. Tarun Agarwal says:

      Hi Arun
      We really appreciate you taking the time out to share your experience with us

  2. very useful article

    1. Tarun Agarwal says:

      Hello virendra,
      Thanks for the compliment.
      For more latest updates on electrical and electronics please visit our blog again.

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