What is the importance of logic gates?

Logic gates are used to make decisions so that electrical outputs only ‘turn on’ when the correct logic sequence has been applied. Each logic gate has a name that helps to describe how different inputs will determine the possible outputs .

What are the 3 main logic gates?

All digital systems can be constructed by only three basic logic gates. These basic gates are called the AND gate, the OR gate, and the NOT gate. Some textbooks also include the NAND gate, the NOR gate and the EOR gate as the members of the family of basic logic gates.

What are the five uses of logic gate?

Logic gates are used in microcontrollers, microprocessors, electronic and electrical project circuits, and embedded system applications. The basic logic gates are categorized into seven types as AND, OR, XOR, NAND, NOR, XNOR, and NOT. These are the important digital devices, mainly based on the Boolean function.

What is the principle of logic gates?

When a transistor is on, or open, then an electric current can flow through. And when it’s off, then no current flows. When you string a bunch of these transistors together, then you get what’s called a logic gate, which lets you add, subtract, multiply, and divide binary numbers in any way imaginable.

What is the symbol of OR gate?

The logic or Boolean expression given for a digital logic OR gate is that for Logical Addition which is denoted by a plus sign, ( + ) giving us the Boolean expression of: A+B = Q.

Why logic gates are called gates?

It is an electronic circuit having one or more inputs and only one output. The relationship between the input and output is based on a certain logic. Hence logic gates are named as AND gate, OR gate, NOT gate, etc.

What is the application of OR gate?

The main applications of OR logic gate are: These are used in circuits where various power sources are available to perform the similar action. Implemented in alarm systems and intrusion detection equipment’s. Used in industrial plants for some protective measures.

What is the application of logic?

The second main part of applied logic concerns the uses of logic and logical methods in different fields outside logic itself. The most general applications are those to the study of language. Logic has also been applied to the study of knowledge, norms, and time.

Where are logic gates used in real life?

The basic logic gates are used in many circuits like a push button lock, light activated burglar alarm, safety thermostat, an automatic watering system etc.

What are the different types of logic gates?

There are seven basic logic gates: AND, OR, XOR, NOT, NAND, NOR, and XNOR. The AND gate is so named because, if 0 is called “false” and 1 is called “true,” the gate acts in the same way as the logical “and” operator. The following illustration and table show the circuit symbol and logic combinations for an AND gate.

What are the universal logic gates?

A universal gate is a gate which can implement any Boolean function without need to use any other gate type. The NAND and NOR gates are universal gates. In practice, this is advantageous since NAND and NOR gates are economical and easier to fabricate and are the basic gates used in all IC digital logic families.

What are XOR and XNOR gates?

The XOR output is asserted whenever an odd number of inputs are asserted, and the XNOR is asserted whenever an even number of inputs are asserted: the XOR is an odd detector, and the XNOR an even detector. This very useful property will be exploited in data error detection circuits discussed later.

Why are NAND and NOR called universal gates?

In Boolean Algebra, the NAND and NOR gates are called universal gates because any digital circuit can be implemented by using any one of these two i.e. any logic gate can be created using NAND or NOR gates only.

Why is NOR gate universal?

The NAND gate and NOR gate are called Universal gates because they can perform all the three essential functions of AND, OR and NOT gates. A two-input NAND gate is a digital combination logic circuit that performs the logical inverse of an AND gate.

Why are NAND gates preferred?

NAND offers less delay.

But the logical effort g for NAND is less than that of NOR. Consider the figure showing 2 input CMOS NAND and NOR gate. The number against each transistor is a measure of size and hence capacitance.

Why is it called a universal gate?

NAND and NOR gates are called universal gates because they can perform all the three basic logic functions OR, AND and NOT.

Which logic family is fastest?

Emitter-coupled logic (ECL)
Emitter-coupled logic (ECL) is a BJT-based logic family which is generally considered as the fastest logic available.

Is XOR a universal gate?

Note that neither the Exclusive-OR gate or the Exclusive-NOR gate can be classed as a universal logic gate as they can not be used on their own or together to produce any other Boolean function.