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

Calculate power delivered to the network, Calculate power delivered to the ...

Calculate power delivered to the network: 1. A wave is traveling from left to right, emerging from Z g =50 with a peak amplitude of V p =5V. The 1-port network [S] has in=0.5-

Inverter, single phase voltage source inverter complete circuit

single phase voltage source inverter complete circuit

Show the equivalent nor realizations of basic not, (a) Show the equivalent ...

(a) Show the equivalent NOR realizations of the basic NOT, OR, and AND gates. (b) Show the equivalent NAND realization of the basic NOT, AND, and OR gates.

Example of high resistivity material, Example of high resistivity material ...

Example of high resistivity material is (A) Nichrome              (B) Silver (C) Gold                      (D) Copper Ans: Nichrome is example of high resistivity

DC Generator, What is Commutator? Explain in brief about the Commutator act...

What is Commutator? Explain in brief about the Commutator action in dc generator.

The city and guild electrical systems design task A and B, The city and gui...

The city and guild electrical systems design task A and 2365-305 Do you have these two assignments to sell ?

OSI Layers, Data transfer code for OSI layers in matlab?

Data transfer code for OSI layers in matlab?

Inference rules of explanation system, Inference Rules of Explanation syste...

Inference Rules of Explanation system How an Explanation System might work where questions like how or why are dealt with. Inference Rules use an if-statement and a then-statem

Calculate armature voltage, Question: A DC, separately excited motor is...

Question: A DC, separately excited motor is supplied from a 240-V source. When the motor is unloaded, it draws 1A of current from the source. When the motor is loaded, it draws

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