Bjt

Bjt

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.

What is the function of BJT?

As with all transistors, the basic function of a BJT is typically to function as a switch or to amplify, filter, and rectify power. Bipolar transistors are current-controlled and operated devices, meaning that a much smaller base current causes a larger current to flow from emitter to collector.

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.

What is BJT and its applications?

Bipolar transistors (bipolar junction transistors: BJTs) can control the collector current via the current applied to the base. Typically, the collector current is the base current times the DC current gain (hFE)*. It is this gain that allows bipolar transistors to be used as amplifiers.

What is the symbol of BJT?

The basic symbols of BJT are n-type and p-type. Electronic current is conducted by both free electrons and holes in bipolar junction transistor.

What is BJT configuration?

The three basic configurations of a BJT are (a) common emitter (CE), (b) common base (CB), (c) common collector (CC) or emitter follower.

Which type of device is BJT?

A bipolar junction transistor (bipolar transistor or BJT) is a type of transistor that uses both electrons and holes as charge carriers. A bipolar junction transistor, also called bipolar transistors, is a three-terminal device that can function as electronic switches or signal amplifiers.

Why BJT is used as an amplifier?

The emitter current caused by the input signal contributes the collector current, which when flows through the load resistor RL, results in a large voltage drop across it. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.

What is difference between BJT and Mosfet?

BJT stands for Bipolar Junction Transistor. MOSFET stands for Metal Oxide Semiconductor Field Effect Transistor. BJT is a three-terminal semiconductor device used for switching and amplification of signals. MOSFET is a four-terminal semiconductor device which is used for switching applications.

Why BJT is used as switch?

The transistor can be used as a switch if biased in the saturation and cut-off regions. This allows current to flow (or not) in other parts of a circuit. Because a transistor's collector current is proportionally limited by its base current, it can be used as a sort of current-controlled switch.

Why FET is called unipolar?

FETs are also known as unipolar transistors since they involve single-carrier-type operation. That is, FETs use either electrons (n-channel) or holes (p-channel) as charge carriers in their operation, but not both. Many different types of field effect transistors exist.

How BJT is current-controlled?

BJT's are current-driven devices i.e. It is a current-controlled device. The current through the two terminals is controlled by a current at the third terminal (base).

What is a BJT amplifier?

The electronic circuit which performs amplification is known as an Amplifier. The transistor is the main component in Amplifiers. Bipolar Junction Transistor (BJT) is the basic transistor among all transistors. So, if we use BJT in the amplifier circuits, those are known as BJT amplifiers.

Where are BJT transistors used?

A bipolar junction transistor (BJT) can be used in many circuit configurations such as an amplifier, oscillator, filter, rectifier or just used as an on-off switch.

What is NPN and PNP transistor?

PNP switches On by a low signal whereas NPN switches ON by a high signal. As we are aware that in PNP transistor, the P represents the polarity of the emitter terminal and N represents the polarity of the base terminal.

What are the advantages of BJT?

There are some advantages of BJT (bipolar junction transistor) which are given below,

• The BJT has a large gain bandwidth.
• It shows better performance at high frequency.
• It has a better voltage gain.
• It can be operated in low or high power applications.
• It has high current density.
• There is a low forward voltage drop.

Why BJT is current control device?

BJT is a current controlled device because the output characteristics of BJT are determined by the input current. In a p-n junction i.e base-emitter junction in BJT the change in voltage (Vbe) is produced only after the change in base current.

Where is the output of a BJT?

The collector-emitter I-V is a set of curves, one for each [Math Processing Error]. In the common emitter configuration, the output port of the BJT is the connection from collector to emitter.

What is common BJT?

The Common Base Amplifier is a type of BJT configuration or bipolar junction transistor, in which the input and output signals share the base terminal of the transistor, hence the name common base (CB).

How many types of BJT are there?

There are two basic types of bipolar transistor construction, PNP and NPN, which basically describes the physical arrangement of the P-type and N-type semiconductor materials from which they are made.

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