Table of Contents
- 1 What is the function of a base terminal in BJT?
- 2 Why there must be some base current in BJT?
- 3 Why is base important in transistor?
- 4 How can base current be reduced in BJT?
- 5 Why is the third terminal base or gate used in a transistor?
- 6 What is base in a transistor?
- 7 What are the three terminals of a BJT?
- 8 What is the base of a transistor?
What is the function of a base terminal in BJT?
Definition: The BJT (bipolar junction transistor) is a current-controlled electronic device main employed for amplification and switching purpose. It comes with three terminals called emitter, base, and collector. The small current at the base side is used to control the large current at the remaining terminals.
Why there must be some base current in BJT?
The base current in the BJT is due to the recombination of holes and electrons. To neutralize the p region an electron leaves the p region. If we take it the other way round, the larger the base current the greater is the recombination, so the collector current should reduce, but Beta Ic/Ib.
What is the function of base terminal?
A bipolar transistor has terminals labeled base, collector, and emitter. A small current at the base terminal (that is, flowing between the base and the emitter) can control or switch a much larger current between the collector and emitter terminals.
Why is it necessary for the base region in a BJT to be narrow?
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. As result of it, the transistor can give good power gain and voltage gain.
Why is base important in transistor?
The base provides proper interaction between the emitter and collector. The flow of majority charge carriers from emitter to the collector is controlled by the base of a transistor. This reduces the rate of electron hole recombination, necessary for a transistor action.
How can base current be reduced in BJT?
What is transistor terminal?
Transistors are four-terminal semiconductor devices commonly used to amplify or switch electronic signals. The 3 terminals are named base, collector and emitter. The current flowing through the base (IB) controls the current through the collector (IC). • The Field Effect Transistor (FET) is a voltage controlled valve.
What is the function on base region of BJT transistor Why is this region made with thin and slightly doped?
The base is kept thin and slightly doped so that, when emitter of transistor is forward biased, the less number of electron-hole combination takes place in base region and majorityof charge carriers going from emitter towards base, pass over to collector.
Why is the third terminal base or gate used in a transistor?
The Bipolar Junction Transistor (BJT) is a current controlled valve. The 3 terminals are named base, collector and emitter. The current flowing through the base (IB) controls the current through the collector (IC). The 3 terminals are named gate, drain and source.
What is base in a transistor?
Base – The middle section of the transistor is known as the base. The base forms two circuits, the input circuit with the emitter and the output circuit with the collector. The base of the transistor is lightly doped and very thin due to which it offers the majority charge carrier to the base.
Why transistor is not used as rectifier?
In order to use a transistor as a rectifier, either the emitter-base segment or the collector-base segment must be used. In a transistor, the base is thinner than the emitter and the collector and it is lightly doped so both segments do not work as a proper rectifier.
What is BJT (bipolar junction transistor)?
Bipolar Junction Transistors (BJT) Transistor Basics. • A Bipolar Junction Transistor is a three layer (npn or pnp) semiconductor device. • There are two pn junctions in the transistor. • The three layers are called the emitter, base and collector.
What are the three terminals of a BJT?
The three terminals of the BJT are called the Base (B), the Collector (C) and the Emitter (E). C C BB EE n n p (a) npntransistor C C BB EE n p p (b) pnptransistor Figure 1. BJT schematics and structures. (a) npntransistor, (b) pnptransistor B E C Base-Emitter junction Base-Collector junction Base-Collector junction Base-Emitter junction B E C
What is the base of a transistor?
Transistor Basics The base is lightly doped and sandwiched between the collector and the emitter. The collector is moderately doped and the emitter is heavily doped. The base region is much thinner than the either the collector or emitter regions. Typical base widths are about 10-6 m.
What is the sign convention of current entering a BJT?
Current entering the emitter, base, and collector has the sign convention of positive while the current that leaves the transistor has the sign convention of negative. BJTs are of two types namely NPN and PNP based on doping types of the three main terminals.