Transistors, Other Engineering

Assignment Help:

Transistors:

The transistor can be a high or low resistance device, hence the name, which is derived from TRANSfer resISTOR. 

It is used in many switching and amplifier circuits where its resistive properties are controlled by small currents. 


The properties of semi-conductor materials, P and N type, were discussed in Module 4.1.1.  A transistor is made up of these materials in the configurations shown in Figure.  The circuit symbols for these transistors are also shown.

381_Transistor construction.png

As can be seen from figure 1, there are two possible types of physical arrangement:

1. The N-P-N transistor, which consists of a thin region of P-type material, sandwiched between two N-type regions.

2. The P-N-P transistor, which consists of a thin region of N-type material, sandwiched between two P-type regions.

The centre region of the device is called the "Base"; one outer region is called the "Emitter", and the other the "Collector".  Although the emitter and collector regions are the same type of extrinsic semiconductor (N-type in N-P-N and P-type in P-N-P), they are constructed and doped differently and are not interchangeable on a practical device.

The circuit symbol for both P-N-P and N-P-N are shows in figure.  The only difference between them is the direction of the arrowhead on the emitter lead.  For either type, the arrowhead indicates the direction of "Conventional" current flow when the base/emitter junction is forward biased (i.e. base +ve with respect to emitter for an N-P-N device, and base -ve relative to emitter for a P-N-P device).

 


Related Discussions:- Transistors

Iosipescu shear test, A second way to determine the shear modulus is to use...

A second way to determine the shear modulus is to use the Isopescu shear test. The sample is placed in a jig and loaded as shown. Under load, a region of pure shear exists

Crystal lattice of bcc, Q. Explain crystal lattice of BCC, FCC and HCP. ...

Q. Explain crystal lattice of BCC, FCC and HCP. Ans. (a) BCC (Body centered cubic): Body centered cubic structure, the unit cell, we observe in addition to the atoms at eight

Linear lateral dynamics, Linear lateral dynamics The second order (two ...

Linear lateral dynamics The second order (two degree of freedom) Dutch-Roll approximation is an approximation to the abovefourth order system for the Dutch Roll dynamics. A jus

Steamtables, How to draw diagrams for Rankine cycle

How to draw diagrams for Rankine cycle

Diod, i donot under stand about diod and transistor

i donot under stand about diod and transistor

Vertical spread, what are the no-arbitrage lower bound of the vertical spre...

what are the no-arbitrage lower bound of the vertical spread

Laptop, How laptop making main function plz established??

How laptop making main function plz established??

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