Engineer Bhaiya Ji

In this article, you will find the  Single Stage BJT & MOSFET Amplifiers which  will cover the topics such as  Concept of amplification with BJT, Transistor as an amplifier, Dynamic Load line, Small signal variations, Transconductance, BJT and Pi-Hybrid model and small signal parameters. 1. Concept of amplification with BJT Small changes of Vi result in greater variation of Vo, thus gain Vo/Vi is provided It should be around a bias point V BE-Q , V CE-Q   2. The Transistor as an amplifier VBB is a continuous source that with R B provides a bias point or polarization: V g  = 0 A variable signal is coupled to V BB V BB  + V g 3. Dynamic load line Variations in input voltage result in the displacement of the load line: Small changes in base-emitter voltage and in base current are produced around the bias point of the device The collector current varies proportionally to the base current (and base-emitter voltage) There are variations of the collector-emitter voltage (outpu

In this article, you will find the  Study Notes on Circuits Analysis and Applications of Diodes, BJT, FET and MOSFET  which will cover the topic as  Introduction, V-I Characteristics, FET small signal model, JFET Biasing, Common Drain amplifier and MOSFET.   1. JFET (Junction FET) The FET is a three terminal (i.e. drain, gate and source), unipolar voltage controlled device. There are two types of such devices  MOSFET (Metal Oxide Semiconductor FET)  and  JFET (Junction FET) . Again the JFET is classified into n-channel JFET where current conduction occurred due to electrons and p-channel JFET where current conduction occurred due to holes. In JFET gate to source junction is always in reversed bias condition and drain is always high potential than a source. Advantages of JFET: Very high input impedance order of 10 8  − 10 10  ohm. The operation of JFET depends on the bulk material current carriers that do not cross junctions. Very high power gain. Smaller in size and havi

In this article, you will find the  Study Notes on Circuits Analysis and Applications of Diodes, BJT, FET and MOSFET  which will cover the topic as  Circuit analysis of Diodes, Application of diodes, Transistors and their Characteristics, Transistor at low frequencies, Hybrid parameters and Miller's Theorem. 1. Circuit Analysis of Diodes There are three different techniques that are used to analyse circuits that contain diodes: Ideal diode equation is used when the diode voltage between the breakdown voltage and the turn-on voltage of the diode Load line analysis can be used as long as you have an I-V characteristic for the diode Piecewise models are used to estimate the diode current and voltage The accuracy depends on the region of operation and the use of the series resistors, Rs and Rz 2. Applications of Diodes Radio demodulation:   an AM signal consists of alternating positive and negative peaks of voltage, whose amplitude or “envelope” is proportional to the ori