OR gate is defined as the device which output is o if any one of its input is 1. The output is o or LOW if all of its input is in LOW state or 0. The output is HIGH or 1 if even any one of input is 1. OR gate have also two or more than two inputs but only one output. At HIGH condition the voltage at output is approx 5v (X≈5v).Īlso read Ultrasonic Distance measurement project using Arduino So Q3 will off and no voltage drop at collector pin and output will HIGH. If input A and input B both are HIGH then both transistors Q1 and Q2 will turn on and current passes through these transistors between ground and +5v and voltage will LOW at the collector pin of T1 and at input of Q3. So Q3 Will remain in turn on and therefore output will LOW. If Any one of input A or B is high then Either Q1 or Either Q2 will off and then no voltage drop occurs at R. Then the transistors Q1 and Q2 are off but transistor Q3 remain in ON, and the voltage at output is LOW or 0v because of Q3 ON and current pass through Q3 and voltage is dropped through R. In the RTL AND gate or transistor gate, When A=0v and B=0v. In this condition the output X=LOW or 0v. Then the both diodes or corresponding Diode D1 or D2 are ON and the circuit is act as short circuit. When A=0, and B=0v or any one of A or B is 0v. So no voltage drop occurs across R and voltage remain at the output is HIGH. And therefore no current flows through resistor R. In the Diode Logic AND gate When the input A = +5v and input B is also +5v, in this case both diodes D1 and D2 are off (because of reverse mode). If it made by using diodes then it called as DL(Diode Logic) and if using transistors it called as RTL (Resistor Transistor Logic). or X is equal to ABC….ĪND gate may be realized by the using of diode and transistors. It Can be read as X is equal to A and B and C ….or X is equal to A dot B dot C…. In the Boolean expression it can be written as X=A.B.C……. Input Variables are represented by A,B,C…… and the the output is written as X. If any one input goes at 0 level then the output of AND gate becomes 0. Means output is 1 if only all inputs are at 1 level. In AND gate Output is High or 1 only when each input of it has in HIGH state. AND GATEĪND gate has two or more than two inputs and only one Output. These 2 level logic also called Positive and Negative Logic. LOW(0 or FALSE or OFF) means 0v (or -ve supply) Input and Outputs of Logic gates in only two levels called TRUE and FALSE, or HIGH and LOW, or ON and OFF, or very popular 0 and 1. These Ics are in LSI (Large scale integration), VLSI (Very large scale integration ) and SSI (Small scale integration). ![]() In practical application of logic gates we see in the form of different Ics. Logic gates made a number of electronic devices and other digital components. ![]() ![]() There are 3 basic Types of Logic gates – (1)-AND, (2)-OR, (3)-NOTīasically Logic gates are elementary electronic logic circuit that can make a variety of different types of circuits by interconnection of these three gates to perform complex logically operations of any computer. We can say that Logic gates are the fundamental building blocks of any digital circuits or digital systems. ![]() The name Logic gate is derived from the sense of the making decisions ability of such a device, and after making decisions it produce one output result. Logic gates are the basic building elements of any digital systems or circuits.
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