Transistor Function

December 23, 2023 Post a Comment

Transistor function

A transistor is a semiconductor device, usually made out of silicon or germanium, used to amplify or attenuate the strength of the electric current in electronic circuits. Transistors have two basic functions: to amplify electric current or to block its passage.

What is the basic action of transistor?

The basic idea behind a transistor is that it lets you control the flow of current through one channel by varying the intensity of a much smaller current that's flowing through a second channel. A transistor is a semiconductor device with three terminals, capable of amplification and rectification.

Where are transistor used?

Transistors are commonly used in digital circuits as electronic switches which can be either in an "on" or "off" state, both for high-power applications such as switched-mode power supplies and for low-power applications such as logic gates.

Why is transistor important?

Transistors transformed the world of electronics and had a huge impact on computer design. Transistors made of semiconductors replaced tubes in the construction of computers. By replacing bulky and unreliable vacuum tubes with transistors, computers could now perform the same functions, using less power and space.

What are the 3 mode of transistor?

Operation Modes

Saturation -- The transistor acts like a short circuit.
Cut-off -- The transistor acts like an open circuit. ...
Active -- The current from collector to emitter is proportional to the current flowing into the base.

What are the application of transistor?

Transistors are used in our day-to-day lives in many forms, which we are aware of as amplifiers and switching apparatuses. As amplifiers, they are being used in various oscillators, modulators, detectors and nearly any circuit to perform a function. In a digital circuit, transistors are used as switches.

Why is transistor used as a 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.

What are the 2 types of transistor?

Transistors typically fall into two main types depending on their construction. These two types are bipolar junction transistors (BJT) and Field Effect Transistors (FET).

What is NPN junction?

The NPN transistor features three terminals: emitter, base and collector. This transistor features two diodes that are connected back to back. The diode seen between the emitter-base terminal is referred to as the emitter-base diode. The diode between collector and base terminal is known as collector-base diodes.

What is type of transistor?

Transistors are broadly divided into three types: bipolar transistors (bipolar junction transistors: BJTs), field-effect transistors (FETs), and insulated-gate bipolar transistors (IGBTs).

Why transistor is used as an amplifier?

A transistor works as an amplifier by taking in a very small weak signal through the base junction and raising the strength of the weak signal. This amplified signal is released through the collector.

What is the difference between a transistor and a switch?

Another difference - A normal switch has only two positions although it may produce electrical bounce when switching from one state to the other. A transistor is perfectly capable of being at any position in between the two endpoint states, ie. it can function as something other than a switch.

Why do transistors need a resistor?

The resistors are used as a means of generating voltage drops and thereby pulling the transistor into the desired operating region. because you need to limit the current to semiconductor terminals. otherwise, the transistors will be damaged.

Why is called transistor?

The word transistor is a combination of transfer and resistance. This is because it transfers the resistance from one end of the device to the other end or we can say, transfer of resistance. Hence, the name transistor. Transistors have very high input resistance and very low output resistance.

What is a transistor example?

Microphones are a classic example of daily use devices that make use of transistors for their basic operation. Various microphones such as a condenser microphone typically make use of an electronic circuit that tends to perform impedance modification by converting mechanical waves into an electrical signal.

Who works on transistor?

The bipolar transistor was invented by three researchers working at Bell Labroratories: John Bardeen, Walter Brattain, and William Schockley.

Is NPN negative or positive?

PNP sensors produce a positive output to your industrial controls input, while NPN sensors produce a negative signal during an “on” state.

What is PN and NPN?

The main difference between the NPN and PNP transistor is, an NPN transistor turns on when the current flows through the base of the transistor. In this type of transistor, the current flows from the collector (C) to the emitter (E). A PNP transistor turns ON, when there is no current at the base of the transistor.

Why is NPN used?

NPN transistors are used in amplifying circuit applications. NPN transistors are used in the Darlington pair circuits for amplifying weak signals. NPN transistors are used in applications we need sinking current. NPN transistors are used in some classic amplifier circuits, the same as 'push-pull' amplifier circuits.