Question: Which Is The Largest Of The Three Transistor Currents?

What is quiescent operating point?

The operating point of a device, also known as a bias point, quiescent point or Q-point, is the steady-state DC voltage or current at a specified terminal of an active device such as a transistor with no input signal applied..

What is current gain in a transistor?

The current gain for the common-base configuration is defined as the change in collector current divided by the change in emitter current when the base-to-collector voltage is constant. Typical common-base current gain in a well-designed bipolar transistor is very close to unity. The most useful amplifier…

What is IC saturation?

When the transistor operates in the Saturation then the voltage between collector and emitter terminal (Vce) is very low (typically it is 0.1 to 0.2 V), and the collector current Ic is maximum. Steps to Identify the Saturation in BJT : 1) Calculate the Ic(sat), the collector current in the saturation. (

Is the base current smaller or larger than the emitter current? The emitter current is always greater than the base current and the collector current. The emitter current is produced due to the movement of total charge carriers. The total current flowing into the transistor must be equal to the total current flowing out of it.

Is FET bipolar?

There are two main types of bipolar junction transistors, (BJT) the NPN and the PNP transistor….Differences between a FET and a Bipolar Transistor.Field Effect Transistor (FET)Bipolar Junction Transistor (BJT)1Low voltage gainHigh voltage gain11 more rows

Why is it called a transistor?

The name transistor is derived from “transfer resistor” it means that the resistance is changed. It is a solid state device which is made up of silicon and germanium. Hence the function of a transistor is to change the resistance for various applications using its specifications.

Which region in a transistor is the most heavily doped?

emitter regionThe emitter region is the most heavily doped area of the transistor. The emitter contains the largest amount of charge carriers out of all regions in the transistor.

What is the difference between BJT and FET?

BJTs and FETs are two different kinds of transistors and also known as active semiconductor devices. … The major difference between BJT and FET is that, in a field effect transistor only majority charge carries flows, whereas in BJT both majority and minority charge carriers flows.

Why FET is preferred over BJT?

FETs are voltage-sensitive devices with high input impedance (on the order of 107 to 1012 Ω). Since this input impedance is considerably higher than that of BJTs, FETs are preferred over BJTs for use as the input stage to a multistage amplifier. One class of FETs (JFETs) generates lower noise than BJTs.

Why base current is weaker than collector current?

Answer: Base is much narrower and thinner than collectors,hence the majority of charge carriers are received by collector. Hence,collector current is greater than base current.

How does current flow in a transistor?

The NPN transistor is designed to pass electrons from the emitter to the collector (so conventional current flows from collector to emitter). … The base still controls current flow, but that current flows in the opposite direction — from emitter to collector.

What is NPN and PNP transistor?

PNP transistor is made up of two P-type material layers with a layer of sandwiched of N-type. The NPN transistor is made up of two N-type material layers with a layer of sandwiched of P-type. In an NPN-transistor, a +ve voltage is set to the collector terminal to generate a flow of current from the collector.

What is the difference between PNP and NPN transistor connections?

One of the major difference between the NPN and PNP transistor is that in the NPN transistor the current flow between collector to emitter when the positive supply is given to the base, whereas in PNP transistor the charge carrier flows from the emitter to collector when negative supply is given to the base.

Why junction transistor is called bipolar disorder?

This type of transistor is called bipolar because both electrons and “holes” are used to carry charges through the n-p-n or p-n-p junction.

Which region in a transistor is the largest?

A bipolar junction transistor has 3 regions: the base, the collector, and the emitter. The collector is the largest region of a BJT transistor.

What are the bias conditions of the base emitter and base collector junctions for a transistor to operate as an amplifier?

With the base-emitter junction is forward biased and the base-collector junction is reversed biased, the transistor can amplify voltage because the collector to emitter voltage is greater than the base to emitter voltage and is also in between the cutoff and saturation states.

Why FET is used instead of BJT?

MOSFET is used for POWER SUPPLIES and is efficient. whereas BJT is used in low power consuming devices like LED. BJT consumes more power as it is a current controlled device,it results in less efficient than mosfet. … MOSFET is efficient because its output depends on the input voltage and not input current.

What is the PNP transistor?

A PNP transistor is a bipolar junction transistor constructed by sandwiching an N-type semiconductor between two P-type semiconductors. A PNP transistor has three terminals – a Collector (C), Emitter (E) and Base (B). The PNP transistor behaves like two PN junctions diodes connected back to back.

What does it mean to bias a transistor?

Transistor Biasing is the process of setting a transistors DC operating voltage or current conditions to the correct level so that any AC input signal can be amplified correctly by the transistor.

Why is base current so small?

hey mate! Few electrons injected by the emitter into the base of an NPN transistor fall into holes. … Most of the emitter current of electrons diffuses through the thin base into the collector. Moreover, modulating the small base current produces a larger change in collector current.

Which of the transistor currents is always the largest?

The emitter current is the largest, the collector current is the smallest, and the base and emitter currents are close. The base current is the largest, the emitter current is the smallest, and the collector and base currents are close. A unipolar device in which the voltage at the gate controls the drain current.