In which region of operation a BJT works as an amplifier?

In the active region, the transistor works as a linear element because the Q point is chosen such that the performance is linear, and we don't see any harmonics in the output. The main application of the BJT is as an amplifier, and this is possible under small-signal conditions.

In what region a BJT is used as an amplifier?

Active Region

This is the region in which transistors have many applications. This is also called as linear region. A transistor while in this region, acts better as an Amplifier. The following circuit diagram shows a transistor working in active region.

When a BJT is employed as an amplifier it operates?

Explanation: A BJT operates as an amplifiers in active mode and as a switch in cut-off or saturation mode. Explanation: In cut-off mode there is no current flowing through the BJT hence both junctions must be reversed biased else if either of them is forward biased then the current will flow. 7.

In which region of the BJT output characteristics BJT works as an amplifier?

Hint:Transistor acts as an amplifier in the active region of its output characteristics. The active region, also called the linear region, lies between the saturation and cut-off region and it is the region where the emitter-base junction is forward biased while the collector-base junction is reverse biased.

Which of the following regions the BJT is biased to work as an amplifier *?

Explanation: A BJT is biased to operate in the active region, to work as an amplifier. It is not biased in the cut-off or saturation region to work as a switch.

Transistor as an amplifier | How does a transistor work | Transistor as an amplifier animation

What are the BJT region of operation?

The regions of a BJT are called emitter, base, and collector. A discrete transistor has three leads for connection to these regions.

What is BJT amplifier?

What is BJT? BJT (bipolar junction transistor) are widely used an amplifier, oscillator, switch etc. It is a current-driven device (MOSFET is voltage driven), the output current is equal to the input current times a factor which is called Gain. A basic BJT has three pins: the Base, Collector, and Emitter.

How do BJT amplify?

A bipolar junction transistor (BJT) amplifies the base-emitter current into the collector-emitter current, so it's a current-controlled current-source. It can come in NPN or PNP variants, for which the current directions are different.

What is required for amplification in BJT?

To drive it as an amplifier the transistor must be kept in its linear region. For using the transistor as a switch, it should operate from the cut-off region to the saturation region – turning on and turning off.

What is cut-off region in BJT?

Cutoff region

This is the region in which transistor tends to behave as an open switch. The transistor has the effect of its collector and base being opened. The collector, emitter and base currents are all zero in this mode of operation. The following figure shows a transistor working in cutoff region.

Why it is called saturation region?

The second region is called “saturation”. This is where the base current has increased well beyond the point that the emitter-base junction is forward biased. In fact, the base current has increased beyond the point where it can cause the collector current flow to increase.

What is active region of transistor?

Active region is that region in which emitter base junction is forward bias while collector base junction is reverse bias. A three terminal device that has an emitter, base and a collector is known as transistor.

How does a transistor work as an 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.

When the BJT operates in active region mode it behaves as?

A transistor in an active region behaves like an amplifier. To achieve amplifying action of the transistor its input and output junctions must be biased accordingly.

When transistor is operated in active region and used for amplification?

For any amplification, (voltage or current), the transistor should be operated in active region i.e. Emitter-base junction is forward biased and the collector-base junction is reverse biased.

In which region MOSFET acts as an amplifier?

When used as a switching device, only triode and cut-off regions are used, whereas, when it is used as an amplifier, the MOSFET must operate in the saturation region, which corresponds to the active region in the BJT.

What is saturation in BJT?

In a nutshell, "saturation" for a BJT is the point where a further increase in base current will not result in a corresponding increase in collector current. That's because Vce is as low as it's going to go for that particular Ic.

What is active region saturation region and cutoff region?

a)When both collector-base & base-emitter junction is reverse biased, it is the active region. b)When both collector-base & base-emitter junction is forward biased, it is the saturation region.

What is breakdown region?

[′brāk‚dau̇n ‚rē·jən] (electronics) Of a semiconductor diode, the entire region of the volt-ampere characteristic beyond the initiation of breakdown for increasing magnitude of bias.

What is pinch off region?

in insulated-gate field-effect transistors (IGFET), "pinch-off" refers to the channel pinching that leads to current saturation behaviour under high source–drain bias. in junction field-effect transistors (JFETs), "pinch-off" refers to the threshold voltage below which the transistor turns off.

What is saturation region in FET?

Saturation region: The FET becomes a good conductor and ID is controlled by the Gate-Source voltage, (VGS) while the Drain-Source voltage, (VDS) has little or no effect. Current ID flowing from drain to source is maximum thus it is referred as saturation region.

What is depletion region in MOSFET?

About The Depletion-mode MOSFETs

The depletion-mode MOSFET has a physically implanted channel connecting the source side and the drain side. In an NMOS, the channel is an n-type silicon region connecting the highly doped n-type source and the n-type drain regions on the top of a p-type substrate.

What is ohmic region in JFET?

The ohmic region (before pinch-off) is usually called the triode region, but it is sometimes called the voltage-controlled region. The JFET is operated in the ohmic region both when a variable resistor is desired and in switching applications.

What is reverse break down region?

The portion of the voltage-current characteristic beyond the initiation of breakdown for an increasing magnitude of reverse current.