- What is BJT and its working?
- What are the characteristics of BJT?
- Why BJT is called bipolar?
- What is a BJT used for?
- What is the difference between BJT and FET?
- What is the symbol of NPN transistor?
- What is a BJT circuit?
- What are the two types of BJT?
- What is the purpose of a BJT?
- What is NPN and PNP transistor?
- How BJT is used as an amplifier?
- What is the symbol of transistor?
What is BJT and its working?
A bipolar junction transistor is a three-terminal semiconductor device that consists of two p-n junctions which are able to amplify or magnify a signal.
It is a current controlled device.
The three terminals of the BJT are the base, the collector, and the emitter.
This is the amplification provided by the BJT..
What are the characteristics of BJT?
BIPOLAR JUNCTION TRANSISTOR CHARACTERISTICSActive region: In this region, the base emitter junction is forward biased and the base-collector junction is reverse biased. … Cut-off region: In this region, both base-emitter and base-collector junctions are reverse biased and the transistor acts like an open switch.More items…
Why BJT is called bipolar?
device is often called the bipolar junction transistor because its operation requires that the negatively charged electrons and their positively charged counterparts (the holes corresponding to an absence of electrons in the crystal lattice) coexist briefly in the presence of one another.
What is a BJT used for?
Bipolar junction transistors (Also known as BJTs) can be used as an amplifier, filter, rectifier, oscillator, or even a switch, which we cover an example in the first section. The transistor will operate as an amplifier or other linear circuit if the transistor is biased into the linear region.
What is the difference between BJT and FET?
BJT and FET are electronic devices. The basic difference between BJT and FET is that the bipolar junction transistor is the bipolar and current control device, while FET (field effect transistor) is the unijunction transistor. It is a voltage control device.
What is the symbol of NPN transistor?
NPN vs PNP TransistorNPN TransistorPNP TransistorSymbolCollector-emitter voltagePositiveNegativeEmitter arrowPointed outPointed in6 more rows•Mar 15, 2020
What is a BJT circuit?
A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. … BJTs use two junctions between two semiconductor types, n-type and p-type, which are regions in a single crystal of material.
What are the two types of BJT?
A bipolar transistor (bipolar junction transistor: BJT) consists of three semiconductor regions forming two junctions. There are two types of structure: npn and pnp. Products with npn up to 800 V and pnp up to -600 V are available. In addition, there are also bias resistor built-in transistors (BRTs).
What is the purpose of a BJT?
The main basic function of a BJT is to amplify current it will allow BJTs are used as amplifiers or switches to produce wide applicability in electronic equipment include mobile phones, industrial control, television, and radio transmitters.
What is NPN and PNP transistor?
In an NPN transistor, a positive voltage is given to the collector terminal to produce a current flow from the collector to the emitter. In a PNP transistor, a positive voltage is given to the emitter terminal to produce current flow from the emitter to collector.
How BJT is used as an amplifier?
A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. … Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.
What is the symbol of transistor?
Transistor Symbols The symbol of NPN and PNP is shown in the figure below. The arrow in the symbol indicates the direction of flow of conventional current in the emitter with forward biasing applied to the emitter-base junction. The only difference between the NPN and PNP transistor is in the direction of the current.