Showing posts with label Logic Gates. Show all posts
Showing posts with label Logic Gates. Show all posts

Semi Conductor Electronics and Communication Systems Complete Lesson

Semiconducting material has conducting nature in between conductors and insulators. At absolute zero temperature the behaves like insulators and at increased temperature they can be have like conducting materials. Silicon and germanium are simple examples of the semiconducting materials which are also called as intrinsic type of semiconducting materials as well as called as pure semiconducting materials. 

 We can modify them as per requirement by adding a small amount of impurities and that phenomena is called as dooping. When you add impurities,we will be getting two types of semiconducting materials called P type and N type. Using this materials we can make electronic devices like diodes, transistors and integrated chips. Here we are going to identify how they are going to work. We are also going to discuss a little bit of digital electronics and  some discussion about logic Gates.

Communication system is a way of communicating information from one place to another place using a channel. There are basically three different types of communications like ground wave communication, sky wave communication and space wave communication.

Here we are going to list out all the posts that are linked with this topics is given below in a systematic order .

Intrinsic and Extrinsic Semi Conducting Materials

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Solving Problems on Logic Gates Concepts

In any electronic circuit we can execute a certain logic with the help of the logic Gates. Here we shall understand how to solve problems using this kind of logic and the digital algebra. There are different types of logic Gates as you mentioned in the previous post like OR gate, AND gate, NOT gate, NAND gate and NOR gate.

Problem One

Here would like to solve small problem on the logic gates. Consider the following expression and identify when the expression leads to a zero value with with respect to the possible values of  A AND B ?

Solution :

While solving this problem we have taken the digital electronics into consideration where and gate acts like an intersection function and target acts like a union function.We can write something in a union function when the input is at least in any of the function  and we can write something on intersection function only when it is there in both the functions.

The complete solution is as shown below.




Problem Two

Find the value of the output for a given digital expression ?


Solution:




Problem Three

Here we shall consider solving one more problem is given below. A simple digital circuit is given who is consisting of different gates and we would like to know the possible output values for the different possible values of the input ?


Problem Four 

Find the output of the following digital circuit which consists of OR gate AND gate as shown.

This problem is solved basing on the logic of the AND gate OR gate is shown below.




Problem Five



In solving all the above problems we had followed the simple logic of the logic gates and the distal algebra.

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Intrinsic and Extrinsic Semi Conducting Materials
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Logic Gates and Truth Tables of Universal Gates

A logic gate  is a particular electronic circuit to execute a certain logic that we are interested.The kind of logic that you want to execute depends on the requirement.

 For example assure that you’re having a fan that has to be switched on.Let it has two switches available at the two sides of a room.If you want the fan to be switched on when at least one of that switches is on, the kind of the logic that you shall execute is similar to OR gate logic. 

And if you would like to have your fan to be switch on only when both the switches are on, then the kind of the logic that you want to execute is called and the gate logic. Whenever the switches on if you want the fan to be switched off and vice versa, then the kind of the logic that you are looking for is actually a NOT gate.All this logic gates works basing an algebra called Boolean algebra.


OR gate works basing on the union logic,AND gate basing on intersection logic and NOT  gate basing on negation logic of mathematics.

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OR gate

This works basing on the union function of the mathematics. You might know that if there are two functions and we will write the member in the union function when it exists at least in any one of the functions.



AND  GATE 

This works basing on intersection function of the mathematics.The output will be on when only both the inputs are on in this kind of the gate. The NOT gate just reverse the input that is given and make it as the output.


NOT gate 

NOT gate is a negation gate. Whatever the input that is given,IT will be just reverse that INPUT. That means if the input is ON, the output will be OFF and vice versa.



This three gates are called BASIC gates which are going to be useful to execute basic logic that we wish to execute in any electronic circuit. Anyway there are further hybrid gates available in the logic gates called  NOR and NAND Gates.

NOR gate

NOR gate is the combination of OR  gate and  NOT gate. The results of this gate is the negation results of the OR  gate. The truth table of the gate is shown below. This gate is also called as a universal gate because we can get all the basic gates with this gate.




NAND GATE

NAND gate is a combination of NOT  gate and AND  gate. The output of this gate is reciprocal of the AND gate. This gate is also called as a universal gate. The truth table of the gate is shown below.




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Intrinsic and Extrinsic Semi Conducting Materials
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