In which regions of operation a BJT works as an open switch and closed switch?

In which region a BJT acts as a closed switch?

Transistor acts as a switch in the saturation region and cutoff region. The emitter-base junction and the collector-base junction is reverse biased in the cutoff region. Both the junctions are forward biased in the saturation region.

When a BJT is used as a switch its mode of operation switches between?

The BJT as Switch REVIEW:

The switched (controlled) current goes between the collector and emitter. The controlling current goes between the base and emitter. When a transistor has zero current through it, it is said to be in a state of cutoff (fully nonconducting).

At which region the transistor is operated as open switch?

A transistor can be used as a solid state switch. If the transistor is operated in the saturation region then it acts as closed switch and when it is operated in the cut off region then it behaves as an open switch.

In which region should the BJT be operating when it is a closed switch Why in which region should it be operating when it is an open switch Why?

The region to the left of the knee is the saturation region. For switching applications, the BJT is most like a closed switch when it is in the saturation region, where VCE is small. It is most like an open switch when it is in cutoff, with iC = 0.

Open Circuits, Closed Circuits

What are the operating regions of BJT?

Bipolar Junction Transistors have three semiconductor regions. The three regions are the emitter region (E), base region (B), and the collector region (c) and these regions are differently doped depending on the type of bipolar transistor it is.

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.

Which region a transistor acts as an open switch cut-off region inverted region active region saturated region?

4) Open or OFF switch in the cut-off region.

What is meant by saturation region?

The point where the load line intersects the IB = IB(sat) curve is called saturation. At this point, the base current is maximum and so is the collector current. At saturation, collector-base junction no longer remains reverse biased and normal transistor action is lost.

What is cutoff and saturation region?

In cutoff, the transistor appears as an open circuit between the collector and emitter terminals. In the circuit above, this implies Vout is equal to 10 volts. 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.

Which of the following region in BJT is an linear region?

Between cutoff and saturation along the load line is the active region of the BJT or also known as linear region.

Under what conditions a transistor works as an open switch?

A transistor will work as an open switch in the cut off state i.e., when both the emitter and collector are reversed biased.

Which are the n regions in an npn BJT?

In npn transistor, the left side n-region (emitter) is heavily doped. So the emitter has a large number of free electrons. We know that in p-type semiconductor, holes are the majority charge carriers and free electrons are the minority charge carriers. The p-region (base) is lightly doped.

In which region a transistor acts 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.

Why it is called saturation region in BJT?

Originally Answered: Why is saturation region called so in BJT characteristics ? A2A. The collector current becomes constant and doesn't increase with increase in base current (saturates). Hence the name.

What is meant by active region?

Active region is that region in which emitter base junction is forward bias while collector base junction is reverse bias.

When the transistor is used as a closed switch it operates in?

Saturation Region Characteristics

The voltage level at the base-emitter junction is more than 0.7v. The base-emitter junction is in forward biased condition. Here, the transistor functions as a CLOSED switch. When the transistor is completely OFF, it moves into the saturation region.

In which region of output characteristic of transistor it is used as a switch?

When a transistor works as a switch it works in cut-off and saturation regions. In the cut-off state, both emitter-base junction and the collector-base junctions are reverse biased.

In what operating region does the collector of the transistor act like a current source?

Saturation Region

The collector and emitter currents are maximum in this mode of operation. The following figure shows a transistor working in saturation region. The transistor operates in saturation region when both the emitter and collector junctions are forward biased.

In which of the following operating regions of BJT the emitter base and collector base junction is forward bias?

In the active region, the emitter-base junction is forward bias and collector-base junction is reverse bias.

In which BJT region of operation are both the collector base and base emitter junctions forward biased?

Saturation region is one in which both Emitter Base and Base Collector junctions of the transistor are forward biased.

Which are the three regions of operation of a transistor which operating region is required for amplifier operation?

Then bipolar transistors have the ability to operate within three different regions: Active Region – the transistor operates as an amplifier and Ic = β*Ib. Saturation – the transistor is “Fully-ON” operating as a switch and Ic = I(saturation) Cut-off – the transistor is “Fully-OFF” operating as a switch and Ic = 0.

What are the three regions of a transistor?

A BJT consists of three differently doped semiconductor regions: the emitter region, the base region and the collector region. These regions are, respectively, p type, n type and p type in a PNP transistor, and n type, p type and n type in an NPN transistor.

What is depletion region in transistor?

In semiconductor physics, the depletion region, also called depletion layer, depletion zone, junction region, space charge region or space charge layer, is an insulating region within a conductive, doped semiconductor material where the mobile charge carriers have been diffused away, or have been forced away by an ...