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When transistor is operated in cut off region or in saturation region it work as a?
The four transistor operation modes are: Saturation — The transistor acts like a short circuit. Current freely flows from collector to emitter. Cut-off — The transistor acts like an open circuit.
Is the transistor biased in the active region?
Collector Feedback Biasing a Transistor The collector to base feedback configuration ensures that the transistor is always biased in the active region regardless of the value of Beta (β). The DC base bias voltage is derived from the collector voltage VC, thus providing good stability.
When a transistor operates as a switch it is in the region or region?
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 the transistor 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. Complete answer: A transistor is a three terminal device that has an emitter, base, and a collector.
When a transistor is cut off what happens?
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 current is largest in a bipolar transistor?
The Common Emitter (CE) Configuration The common emitter amplifier configuration produces the highest current and power gain of all the three bipolar transistor configurations.
How do you know if a transistor is active?
Complete step by step answer: Active region lies between saturation and cutoff. The transistor in this operates in an active region, when the collector junction is reverse biased and emitter junction is forward biased. The transistor will function normally.
What is IC saturation?
Saturation, as the name might imply, 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.
How do you know if a transistor is in active mode?
REVIEW: A transistor is said to be in its active mode if it is operating somewhere between fully on (saturated) and fully off (cutoff). Base current regulates collector current. By regulate, we mean that no more collector current can exist than what is allowed by the base current.
Which current is largest?
Which two currents are relatively close in magnitude? (Points : 5) The collector current is the largest, the base current is the smallest, and the collector and emitter currents are close.
Which is the largest transistor current?
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.
When does the transistor operate in the cutoff region?
The transistor operates in cutoff region when both the emitter and collector junctions are reverse biased. As in cutoff region, the collector current, emitter current and base currents are nil, we can write as I C = I E = I B = 0 Where I C = collector current, I E = emitter current, and I B = base current.
How is biasing done in a transistor circuit?
The supply of suitable external dc voltage is called as biasing. Either forward or reverse biasing is done to the emitter and collector junctions of the transistor. These biasing methods make the transistor circuit to work in four kinds of regions such as Active region, Saturation region, Cutoff region and Inverse active region s e l d o m u s e d.
What are the four regions of a transistor?
Either forward or reverse biasing is done to the emitter and collector junctions of the transistor. These biasing methods make the transistor circuit to work in four kinds of regions such as Active region, Saturation region, Cutoff region and Inverse active region (seldom used).
How does a transistor behave as a switch?
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.