Storage delay and transistor alpha- beta, Electrical Engineering

Assignment Help:

Turn-on, turn-off, and storage delay:

The Bipolar transistor shows a few delay characteristics while turning on and off. Most of the transistors, and particularly power transistors, show long base storage time that limits maximum frequency of operation in switching applications. One technique for reducing this storage time is using a Baker clamp.

Transistor 'alpha' and 'beta':

The proportion of electrons capable to cross the base and reach the collector is a measure of the BJT (bipolar junction transistor) efficiency. The heavy doping of the emitter region and light doping of the base region origin several electrons to be injected from the emitter into the base than as compared to the holes to be injected from the base into the emitter. The common-emitter current gain is presented by βF or hfe; it is approximately the ratio of the DC collector current to the DC (direct current) base current in forward-active region. It is generally greater than 100 for small-signal transistors but can be smaller in transistors intended for high-power applications. An additional significant parameter is the common-base current gain, αF. The common-base current gain is almost the gain of current from emitter to collector in the forward-active region. This ratio generally has a value that is close to unity; approximately between the 0.98 and 0.998. Alpha and beta are more precisely related through the following identities (NPN transistor):

αF = Ic/IE

βF = Ic/IB

βF = αF / (1- αF) ↔ αF = βF / (βF +1)


Related Discussions:- Storage delay and transistor alpha- beta

Induction motor, principle and operation of 3phace induction motor

principle and operation of 3phace induction motor

Binary address does the dot-decimal ip address , i. Each computer related t...

i. Each computer related to the public internet has a unique Internet Protocol address caleed as the IP address. The IP address is a 32-bit address. What is the maximum number of c

Equivalent circuits, Modern complex systems are normally constructed by int...

Modern complex systems are normally constructed by interconnecting sub-units. Therefore the systems engineer is often not too concerned about the details of what is inside these

Bi directional buffer 74ls245 , Bi Directional Buffer 74LS245 This types...

Bi Directional Buffer 74LS245 This types  of bi directional  buffer is required for data  bus as it has  to function as bi directional bus. The logic  diagram  of such  buffer i

What is program counter, Program counter holds the address of either the fi...

Program counter holds the address of either the first byte of the next instruction to be fetched for implementation or the address of the next byte of a multi byte instruction, whi

Working of bootstrap sweep circuit, analysis and detail working of bootstra...

analysis and detail working of bootstrap sweep circuit

Need for modulation recognition - software defined radio, Need for Modulati...

Need for Modulation Recognition There are so many communication signals all available with different types of modulation and different frequencies. It is necessary to identify

Explain the delay model, Explain the delay model based on logical effort of...

Explain the delay model based on logical effort often used in estimating delays in logic cells. Hence use the model to predict the delay of a 4-input NOR logic cell with a 3 times

Draw a schematic diagram of transformer connections, Q. Three single-phase,...

Q. Three single-phase, 10-kVA, 2400/120-V, 60- Hz transformers are connected to form a three- phase, 4160/208-V transformer bank. Each of the single-phase transformers has an equiv

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd