Is the collector smaller than emitter?

To operate in active mode, a transistor's V_BE must be greater than zero and V_BC must be negative. Thus, the base voltage must be less than the collector, but greater than the emitter. That also means the collector must be greater than the emitter.

Is emitter larger than collector?

Answer: The collector region is the largest of all regions because it must dissipate more heat than the emitter or base regions. It is designed to be large because in order to dissipate all the heater, the extra surface area allows it to do so. ...

Is emitter thicker than collector?

Answer. Collector has larger area than base and emitter because base collector is reverse biased, hence the current flow here due to the minority carriers and the large power dissipation takes place by the majority carriers, this power dissipated in the form of heat..

Is emitter current greater than collector current?

We know that the concentration of the impurities in the collector is slightly less than the concentration in the emitter. Hence, even if you apply the battery at the junction of the collector and the base in forward bias, the emitter current will always be greater than the collector current.

Why is Collector current less than emitter?

In a transistor the collector current is always less than the emitter current because, collector side is reverse - biased and the emitter side is forward biased. a few electrons are lost in the base and only remaining ones reach the collector. collector being reverse biased, attracts less electrons.

Emitter, Base

Why collector current is quite large?

Collector Current

It increases for larger emitter currents because the larger number of electrons injected into the base exceeds the available holes for recombination so the fraction which recombine to produce base current delines even further.

Which element has biggest size in transistor?

Is the base region much thinner or much wider than the collector and emitter regions?

Transistors have three sections namely – the emitter, the base, and the collector. The base is much thinner than the emitter, and the collector is comparatively wider than both. The emitter is heavily doped so that it can inject large number of charge carriers for current conduction.

Which of the following has highest current gain?

the power gain is highest in Common emitter: This transistor configuration is probably the most widely used. The circuit provides a medium input and output impedance levels. Both current and voltage gain can be described as medium, but the output is the inverse of the input, i.e. 180° phase change.

What is emitter base and collector?

Transistors are composed of three parts ' a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector is the larger electrical supply, and the emitter is the outlet for that supply.

What is the smallest region in a transistor?

The base current IB is always the smallest. The collector current IC and emitter current IE are relatively close in magnitude.

What is the size comparison between base emitter and collector?

This is because the work of the emitter is to supply charge carrier to the collector via the base. The size of the emitter is more than base but less than the collector. Base: The size of the base region is extremely small, it is less than emitter as well as the collector.

Which terminal is very thin?

The base of a transistor is kept very thin compared to the collector and emitter so that most of the carriers(carriers means electron in case of NPN transistor and holes in case of PNP transistor) pass to the collector, injected from the emitter i.e, less number of electron-hole recombination take place and the whole ...

Why is Collector region wider than emitter region?

Its main function (as indicated by its name) is to collect the majority of charge carriers coming from the emitter and passing through the base. In most transistors, the collector region is made physically larger than the emitter region because it has to dissipate much greater power.

Why is emitter more heavily doped than collector?

The reason the emitter is the most heavily doped region is because it serves to inject a large amount of charge carriers into the base, which then travels into the collector, so that switching or amplification can occur. In npn transistors, the n-type emitter injects free electrons into the base.

Why is the area of collector base junction made larger than the area of emitter base junction in a transistor?

Solution : During the working of a transistor, most of the heat is produced at the base collector junction. The area of this junction is made large so that the heat may be dissipated to surroundings.

Which configuration has the lowest current gain?

Why BJT is called bipolar?

Bipolar transistors are a type of transistor composed of pn junctions, which are also called bipolar junction transistors (BJTs). Whereas a field-effect transistor is a unipolar device, a bipolar transistor is so named because its operation involves two kinds of charge carriers, holes and electrons.

Which amplifier has highest voltage gain?

The common emitter amplifier configuration produces the highest current and power gain of all the three bipolar transistor configurations.

Why is the base region thin?

Solution : The base region in a transistor is made very thin so that there is a better conduction of majority carriers from emitter to collector through base.

Why the width of base region is thin in transistor?

The base of a transistor is lightly doped than the emitter and narrowed so that almost all electrons injected from the emitter (in a npn transistor) diffuse right across the base to the collector junction without recombining with holes. In other words, the base width is kept smaller than the recombination distance.

Why is the base region thin and low doped?

If base is made thick and highly doped, majority carriers will combine with the other carriers within the base and only few is collected by the collector which leads to small output collector current. Thus in order to have large output collector current, base is made thin and lightly doped.

How is the collector of a transistor doped?

Emitter is heavily doped. Its job is to emit or inject electrons into the base. Bases are lightly doped and very thin, it passes most of the emitter-injected electrons on to the collector. The doping level of collector is intermediate between the heavy doping of emitter and the light doping of the base.

Which is the higher gain provided by a CE configuration?

The higher gain provided by a C-E configuration is : resistance.

Are transistors semiconductors?

transistor, semiconductor device for amplifying, controlling, and generating electrical signals.