Explain pnp transistor circuit, Electrical Engineering

Assignment Help:

Explain pnp transistor circuit.

pnp transistor: A transistor consist of  three terminals. In this pnp transistor there is two blocks of p- type semiconductors that are separated by a thin layer of n-type semiconductor. This pnp transistor circuit is demonstrated in the figure below. The emitter base junction is forward biased whereas the collector base junction is reversing biased. There forward biased voltage is VEB is quite small, while the reverse biased voltage VCB is much high. Since the emitter base junction is forward biased a large number of holes (that is majority carriers) in the emitter (i.e. p- type) are pushed towards the base. It constitutes the emitter current IE. While these holes enter p- type material (base), they are subject to combine with electrons. Because the base is lightly doped and very thin, simply some electrons (less than 5 percent) combine with electrons to constitute base current that is IB. The remaining holes (more than 95 percent) diffuse across thin base region and reach collector space charge layer. All holes then come under the affect of the negatively biased p- region and are attracted or collected through the collector. It constitutes collector current that is IC. It is seen that almost all emitter current flows in the collector circuit. Therefore, the emitter current is the sum of collector current and base current that is IE = IC+ IB.

589_pnp transistor circuit.png

pnp transistor circuit


Related Discussions:- Explain pnp transistor circuit

What are synchronous decade counters, What are Synchronous Decade Counters?...

What are Synchronous Decade Counters? Alike to an asynchronous decade counter, the synchronous decade counter counts from 0 to 9 and then recycles to 0 again, This is done by

Describe the time division switching, Q. Describe the time division switchi...

Q. Describe the time division switching? Ans: Space and Time Switching: Space Switches: Connections can be made between outgoing and incoming PCM highways by means of

Explain the bidirectional shift registers, Explain the Bidirectional Shift ...

Explain the Bidirectional Shift Registers? A Reversible or A Bidirectional shift register is one in which the data can be shift either left or right. D flip-flops are used by

Form factor, Significance of form factor,why we decide the power handing ca...

Significance of form factor,why we decide the power handing capacity in transmission with the help of form factor?

Power electronics, principle of 120 degree mode of operation of voltage sou...

principle of 120 degree mode of operation of voltage source intverter

Determine the percentage reduction in the applied voltage, A large inductio...

A large induction motor is usually started by applying a reduced voltage across themotor; such a voltage may be obtained from an autotrans- former. A motor is to be started on 50%

Example of clamper circuits, Example of clamper circuits: Example of c...

Example of clamper circuits: Example of clamper circuits are as follow Voltage multiplier circuit: voltage circuit is employed to maintain a relatively low transformer pe

Super-heterodyne receiver, Write a short explanation of the principles of s...

Write a short explanation of the principles of super-heterodyne receiver. It may help to use sample block diagram to state the process. Why is the production of the intermediate fr

Effective mass, Effective Mass The electrons' "wave-particle" motio...

Effective Mass The electrons' "wave-particle" motion in a lattice is not the same as that for a free electron, because of the interaction with the periodic potential of the

Evaluate gm and pm for the asymptotic bode plot, Q. The loop gain of an ele...

Q. The loop gain of an elementary feedback control system(see Figure) is given by G(s)·H(s), which is 10/(1+s/2)(1+s/6)(1+s/50). Sketch the asymptotic Bode plot of the loop-gain fu

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