Why BJT is current control device?

A BJT is a current controlled device because its output characteristics are determined by the input current. A FET is voltage controlled device because its output characteristics are determined by the Field which depends on Voltage applied.

Is BJT a current controlled current source?

This effect can be used to amplify the input voltage or current. BJTs can be thought of as voltage-controlled current sources, but are more simply characterized as current-controlled current sources, or current amplifiers, due to the low impedance at the base.

Why transistor is current operated device?

The voltage across a base-emitter junction is set so that the electric field due to this external voltage will reduce the width of the depletion region. This electric field determines the flow of the charge carriers in a transistor. So, we can conclude that a transistor is a current-controlled voltage device.

Why transistor is called current controlled device Wikipedia?

A voltage or current applied to one pair of the transistor's terminals controls the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal.

What is mean by current controlled device?

When output voltage is controlled by input current then that electronic device is known as current controlled device. For Eg. BJT is current control device because its output voltage (Vce) in case of comman emitter configuration is controlled by input current (Base current ).

@ Why BJT is Current Controlled Device / MOSET, IGBT are Voltage Controlled Device?

Is BJT a current controlled or voltage controlled device?

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). It has a low input impedance.

Is BJT is a voltage controlled device?

A BJT is a current controlled device because its output characteristics are determined by the input current. A FET is voltage controlled device because its output characteristics are determined by the Field which depends on Voltage applied.

Why BJT is minority carrier device?

From the point of view of base, the injected electrons or holes from the emitter are minority charge carriers. These minority carriers are swept across the reverse biased Collector Base Junction enables the conduction in the Transistor. That is the reason.

What is the current gain of BJT is?

The current gain for a CB configuration is called Alpha, ( α ). In a BJT amplifier the emitter current is always greater than the collector current as I_E = I_B + I_C, the current gain (α) of the amplifier must therefore be less than one (unity) as I_C is always less than I_E by the value of I_B.

Why is Collector region wider than emitter region in BJT?

Answer: The collector region is the largest of all regions because it must dissipate more heat than the emitter or base regions.

Which terminal of BJT is known as control terminal?

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 Field Effect Transistor (FET) is a voltage controlled valve.

Why BJT is called current controlled device and FET is a voltage controlled device explain?

Question: Why BJT is known as current controlled device and FET is known as voltage controlled device? Answer: In BJT, output current depends on input current , so current controlled device. In FET, output current depends on input voltage, so voltage controlled device.

What is the main reason that the BJT does not behave as an ideal current source in active region?

A BJT becomes saturated when the base current is too high for it to remain in the active mode.

What type of device is BJT?

Simply put, a BJT is a three-terminal semiconductor device. The name "bipolar" comes from the fact that this type of transistor contains two types of semiconductor material—one positive type (p-type) and one negative type (n-type)—through which a current flows. Bipolar junction transistors usually contain silicon.

Why BJT is called amplification gain device?

The three terminals of the BJT are the base, the collector, and the emitter. A signal of a small amplitude applied to the base is available in the amplified form at the collector of the transistor. This is the amplification provided by the BJT.

Is bipolar junction transistor BJT a current controlled or voltage controlled device why it is also called a minority carrier device?

as in the base region movement of charge carrier is because of the electrons which is minority charge carrier in the base region. So a BJT can said to be minority current controlled device.

Why it is called as voltage controlled device?

Originally Answered: Why is a FET called a voltage-controlled device? The applied voltage between the Gate and the Source controls the drain current (Id). Which means that you use voltage to control the output current. Hence, FET is a voltage controlled device.

When BJT is in active region of operation it works as?

Between cutoff and saturation along the load line is the active region of the BJT or also known as linear region. For the BJT to operate in the active region, the condition is that the base-emitter junction should be forward-biased while the base-collector junction is reverse-biased.

How do you know if BJT is in active mode?

When a BJT operates in forward active mode?

In the active mode, one junction (emitter to base) is forward biased and another junction (collector to base) is reverse biased. In other words, if we assume two p-n junctions as two p-n junction diodes, one diode will be forward biased and another diode will be reverse biased.

Is transistor a current controlled device?

So, transistor is a current controlled device.

Why BJT is bipolar and MOSFET is unipolar?

BJT is called bipolar because the current in a BJT flows due to both electron and hole carriers, whereas the current in a Field Effect Transistor (FET) flows due to either electron carriers for N-type FET or hole carriers for P-type FET, hence they're called unipolar transistors.

How transistor is used as current amplifier?

How does a transistor work 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.

Which of the following BJT terminal controls the current flow?

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

What is transistor current?

Transistor current:

The current that leaves collector base junction α_dc * I_E and the value of α_dc is typically 0.96 to 0.99. In NPN transistor, junction J2 (collector-base) will be reverse biased, therefore there is a reverse leakage current I_CBO (collector-base leakage current) flows towards the collector terminal.