Skip to main content

Bipolar Junction Transistors (BJT)

Again because of basic knowledge about Electronic Devices you do not need to study about working of BJT in detail and you can directly come to different configurations of BJT which are Common Emitter, Common Base, and Common Collector and about the various operating modes of BJT which are cut-off, Active and Saturation. Then you can study about biasing techniques in BJT which are Fixed Bias, Self Bias, and Voltage Divider Bias and in each of these configurations you need to understand how to compute the stability factor. By calculating Stability Factor you can determine the relative stability of each configuration. To improve the thermal stability you can also study about Compensation Techniques such as Diode Compensation, Thermistor, and Sensistor Compensation.
Image result for bjt
Based on this knowledge you can study about DC applications of BJT such as Voltage Regulator by the use of the combination of BJT and Zener Diode. Also the concept of Current Mirror and Current Steering Circuits.
After this, you can start with BJT amplifiers in which you have to study about a small-signal model of BJT and there are three models which are remodel, Hybrid Parameter Model and  Hybrid-pi Model. The first two models are most important and identical because both can be obtained from each other by Source Transformation. You can then determine various parameters of the three configurations of BJT which are Voltage Gain, Input resistance and Output Resistance of the amplifier.
Then you have to study about Frequency Response of the amplifier in which there are two sections which are Low-Frequency Response and High-Frequency Response. In High-Frequency Response you have to study about the concept of Miller Effect and in both the frequency response you need to be clear about determining Cut-off Frequency and Unity Gain Frequency as that can be directly asked in GATE.
Beyond this, you also need to prepare the concept of Multistage Amplifiers such as Cascaded Configuration and Cascode Configuration. In cascade configuration, you need to study about the effect of cascading identical or non-identical stages on cut-off frequency and gain of the amplifier.
Labels:

Comments

Post a Comment

Popular posts from this blog

Mode of Entrance Exam in India

Earlier, the entrance exams were held on pen and paper but as the technology advanced, the mode of examination changed. Few of the following popular modes in which the exams are held are as follows: Offline Mode  – This is the traditional pen and paper format, in which candidates have to write answer on a paper or OMR sheet. CBT Mode  – Compute based test mode is the most popular mode of entrance exams right now. Here, the candidates have to attempt the exam on a computer and mark answers with the help of a mouse. In some of the exams, candidates even get virtual calculate as well. Online Mode  – Even in online mode the candidates take the exam via computer. However, the only difference is that candidates can take the exam form anywhere and are not restricted to go to a particular center. To take these types of exam, candidates just need to have a computer, good internet connection, and a webcam.
Post a Comment
Read more

How to use Virtual Calculator for GATE 2020 ?

GATE 2020 Virtual Calculator - How to Use it? One of the features which will be provided to all candidates attempting the entrance examination is the virtual calculator of GATE 2020. Along with the online examination, the GATE 2020 virtual calculator will be made available to help the candidates with their calculations and more. The calculator was incorporated as an important feature of GATE in 2016. Since the candidates will not be allowed to use a physical calculator, they will have to use the virtual calculator of GATE 2020. The question paper will also be set according to GATE 2020 virtual calculator. Read the full article to know in detail the steps to use and main feature of GATE 2020 Virtual Calculator. Features of GATE 2020 Virtual Calculator The virtual calculator of GATE 2020 will be made available for the candidates who are appearing for the examination. In the GATE 2020 virtual calculator, the candidates will be able to find the keys for simple operations on ...
Post a Comment
Read more