Electronics Engineering

Why is an ordinary junction transistor is called bipolar transistor?


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2013-04-04 11:38:42
2013-04-04 11:38:42

Because it uses N-type and P-type semiconductor, usually silicon.

The construction will either be NPN or PNP, with the different types in a "sandwich" construction.

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Related Questions

When bipolar junction transistor(BJT) is operated under proper biasing large current flows through the BJT,thus it is called current operated device.

For a bipolar junction transistor: * Emitter * Collector * Base For a field-effect transistor: * Drain * Source * Gate

transistor employin flow of both electron and holes for conduction is bipolar junction transistor.they are bipolar in nature.a bjt has two pn junctions, one between emitter and base and the other between base and collector.a transistor employin both hole and electrons(major and minor charge carrier) for conduction is bipolar junction transistor.No.There is confusion above between electrons/holes and majority/minority carriers.In P-type, majority carriers are holes, minorities are electrons.In N-type, majority carriers are electrons, minorities are holes.Generally, majority carriers are preferred, minority carriers are designed to be of as low density as possible.The simplest distinction is that there are two different types of semiconductor, P-type and N-type, which may be PNP or NPN, and that the device uses a "sandwich" junction construction.

A bipolar junction transistor can be used as a diode by shorting the base and collector.A junction field effect transistor operates as a reverse biased diode, but some types will be damaged or destroyed if forward biased.A metal oxide semiconductor field effect transistor is not a diode.A unijunction transistor is a diode with 2 connections some distance apart on its cathode (called base 1 and base 2).A programmable unijunction transistor is really a variation on the silicon controlled rectifier.etc.

In an NPN transistor an emiter follower refers to an amplifier topology. The emiter follower configuration is when the emitter of a N-Type Bipolar Junction Transistor (BJT) is connected to the common point on a circuit (typically ground). This is not always the case, however, because many amplifier configuration exist.

Transistor is called Bi-Polar device because the current can be flow due to electron and holes, hence it is called bipolar.

Because the insulation between the gate and the channel is only a reverse biased PN junction. If this junction were to become forward biased the jfet would no longer operate as a transistor at those times.

In the switching transistor the output current is controlled by the (current) and this is also called current controlled current device (CCCD). But in ordinary switch we controlled output current physically...

it makes use of both majority and minority carriers in its operation

because once saturated it will conduct current both way raja TOQEER (Pakistan)

The three legs on a typical bi-junction transistor (BJT) are called the Emitter, the Base, and the Collector. (There are other names when you start talking about FET's, SCR's, TRIAC's, Uni-Junction transistors, etc. If that's what you're looking for, please re-ask the question.)

Bipolar junction transistors has two junctions base emitter junction, base collector junction. Accordingly there are four different regions of operation in which either of the two junctions are forward biased reverse biased or both. But the BJT can be effectively operated in there different modes according to the external bias voltage applied at each junction. i.e. Transistor in active region, saturation and cutoff. The other region of operation of BJT is called as inverse active region.

The terminals on a MOSFET are called the "Source", "Drain", and "Gate". Just as with a bipolar junction transistor (BJT) the direction of current flow will be based on the doping configuration of the semiconductor. In a MOSFET, the doping configuration can be either n-channel or p-channel, but with MOSFETS, they also come in a "normally on" or "normally off" configuration, which is specified by being either "depletion mode" or "enhancement mode", respectively.

Field Effect Transistors (both JFET & MOSFET) are unipolar because they use only one type of current carrier (electrons in N-channel or holes in P-channel), unlike bipolar transistors (both junction & the obsolete point contact) which always use both types of current carriers.

the transistor is called as transistor because there is transfer of resistance from input to output .transfer resistance so it is transistor.

As the applied base-collector voltage (VBC) varies, the base-collector depletion region varies in size. This variation causes the gain of the device to change, since the gain is related to the width of the effective base region. This effect is often called the "Early Effect"An NPN bipolar transistor can be considered as two diodes connected anode to anode. In normal operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased. In an npn-type transistor for example, electrons from the emitter wander (or "diffuse") into the base

In the original point contact transistor design, there was a base of semiconductor material at the bottom to which two point contact wires were connected, each point contact wire being very close to the other on the surface of the base. There were three wires, one to each of the point contacts and one to the semiconductor base. The two point contacts were called the collector and emitter, and the base was called - logically, being at the bottom - the base.We tend to show the base as being between the collector and emitter, but in actuality the collector and emitter were added on top of the base.Although all modern bipolar transistors are junction transistors, the standard bipolar transistor symbol is actually a point contact transistor symbol, although the base may be drawn on any side not just the bottom.

transistor. This word is a blended form of transfer of resistor. The legs of transistor (collector, emitter,base) transfer the resistance. So it is called as transistor

(Electronics) Resistor placed in the emitter lead of a transistor circuit to minimize the effects of temperature on the emitter-base junction resistance and its resistance is called swamping resistance.

FET stands for Filed Effect Transistor. Bipolar transistors have junctions to control current but a FET does it by controlling the conductivity of a single channel by altering the electric Field of that channel.

FETs are sometimes called unipolar transistors to contrast their single-carrier-type operation with the dual-carrier-type operation of bipolar (junction) transistors (BJT).

The change of collector current with respect to emitter current. Typically 0.95 to 0.995. So a transistor with alpha of 0.95 might have an emitter current of 10 mA, collector current 9.5 mA. The "missing" current becomes base current and does not reach the collector. The more commonly used figure for current gain is beta, the ratio of collector current to base current, typically 50 to 500. In CB MODE It is called the common base, short-ckt, amplification factor.

Bipolar depression is called bipolar to distinguish from unipolar, also simply called as 'Depressive Disorder'. In bipolar disorder the person has depression and also has had hypomania or mania in which symptoms are opposite that of depression.

The junction between a motor neruon's axon and the muscle cell membrane is called a neuromuscular junction or a myoneuraljunction?

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