This module covers the fundamental ideas underlying design of modern digital systems. This module explains the basis of circuit elements. The branch of mathematics involving digital logic is aptly named Boolean Algebra. . Two other important gates are the exclusive-OR and exclusive -NOR  ‎Basic Operators · ‎XOR and XNOR · ‎Formal Mathematical · ‎Boolean Algebra Laws. Digital Logic Design. B i. ▫ Basics. ▫ Combinational Circuits. ▫ Sequential Circuits. Pu-Jen Cheng. Adapted from the slides prepared by S. Dandamudi for the.


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The symbol of NOT gate is depicted in the figure 1 and its working is represented in truth table. Output of AND gate will be high only when both the inputs are high.

Digital Circuits Logic Gates

Symbol for AND gate is as shown in the figure 2 below. It contains 4 AND gates each having two inputs. Let us see how we can do that Figure3: Character to represent or gate is " ".

OR gate performs addition. The Symbol and truth table of OR gate is shown in the figure 5. IC digital circuits logic design used for OR operation.

To learn digital circuits logic design on IC numbers for digital circuits visit: Here is a real-world example that is always simple, AND gate can be used to switch on the light in a room when the room is dark.

Basic Gates and Functions

digital circuits logic design Please see the figure 7. The outputs of all NAND gates are high if any of the inputs are low. The symbol is an AND gate with a small circle on the output. The small circle represents inversion. The outputs of all NOR gates are low if any of the inputs are high.


In this digital circuits logic design, the complex task of designing the controls of a computer is reduced to a simpler task of programming a collection of much simpler logic machines. Almost all computers are synchronous.

However, true asynchronous computers have also been designed.

One example is the Aspida DLX core. Digital circuits logic design advantages have not materialized, because modern computer designs already run at the speed of their slowest component, usually memory.

These do use somewhat less power because a clock distribution network is not needed. An unexpected advantage is that asynchronous computers do not produce spectrally-pure radio noise, so they are used in some mobile-phone base-station controllers.

Digital Circuits/Logic Operations

Digital circuits logic design may be more secure in cryptographic applications because their electrical and radio emissions can be more difficult to decode.

Computer architects have applied large amounts of ingenuity to computer design to reduce the cost and increase the speed and immunity to programming errors of computers.

An increasingly common goal is to reduce the power used in a battery-powered computer system, such as a cell-phone. Many computer architects serve an extended apprenticeship as microprogrammers.

  • Digital Circuits/Logic Operations - Wikibooks, open books for an open world
  • The basic elements of digital circuits: MOSFET, gate and the logic
  • Digital electronics - Wikipedia
  • Universal gates

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