Table of Contents
- 1 Why is Collector always reverse biased?
- 2 Why emitter is forward biased and collector is reverse biased?
- 3 Which transistor junction is always reverse biased?
- 4 Why collector current increases even if collector base junction is reverse biased?
- 5 Why diode is reverse biased in determining the band gap of semi conductor?
- 6 What is the role of the collector base reverse bias junction in the BJT transistor?
Why is Collector always reverse biased?
Collector is always reverse-biased w.r.t base so as to remove the charge carriers from the base-collector junction.
Why emitter is forward biased and collector is reverse biased?
As shown in the above figure, the emitter to base junction is forward biased and the collector to base junction is reverse biased. Forward bias on the emitter to base junction causes the electrons to flow from N type emitter towards the bias. This condition formulates the emitter current (IE).
Is collector base junction reverse biased?
Consider an n-p-n transistor, In base emitter transistors the current is flowing forward biased, whereas, in collector and emitter transistors the current is passing in reverse biased. Thus, the emitter-base junction is forward biased and collector-base junction is reverse biased.
What is reverse bias in transistor?
If it is reverse biased, the transistor is off. This is just like a diode. If you forward bias a diode, the diode conducts. If you reverse bias the diode, the diode cuts off. Now, the base-emitter junction in a transistor is going to essentially turn the transistor on or off.
Which transistor junction is always reverse biased?
base collector junction
In a transistor, the emitter base junction is always forward biased, whereas, the base collector junction is always reverse biased.
Why collector current increases even if collector base junction is reverse biased?
The electric field established in this depletion region is directed from collector to base due to reverse bias. So the electron again tends to move towards the collector giving rise to collector current.
When both emitter and collector junctions are reverse biased the transistor is said to be at region?
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….Transistor biasing.
| EMITTER JUNCTION | COLLECTOR JUNCTION | REGION OF OPERATION |
|---|---|---|
| Reverse biased | Reverse biased | Cutoff region |
When a junction diode is reverse biased?
Hint: A p-n junction is said to be in reverse bias if the p-side of the junction is connected to a negative terminal of a battery and the n side is connected to the negative side of the battery.
Why diode is reverse biased in determining the band gap of semi conductor?
To determine the energy band gap of a semi-conducting material, we study the variation of its conductance with temperature. In reverse bias, the current flowing through the PN junction is quite small and internal heating of the junction does not take place. When PN junction is placed in reverse bias as shown in fig.
What is the role of the collector base reverse bias junction in the BJT transistor?
Its function is to remove charges from its junction with the base. In Fig. 8.2 (i), the collector (p-type) of pnp transistor has a reverse bias and receives hole charges that flow in the output circuit. The base is lightly doped and very thin ; it passes most of the emitter injected charge carriers to the collector.
When the collector junction in a transistor is biased in reverse direction and the emitter junction in the forward direction the transistor is said to be is the active region?
Cut-off Region. The region of the output characteristics where both the junctions (emitter and collector) are reverse biased, is known as the cutoff region of the transistor. In order to cut-off the transistor, it is not enough to reduce lB to zero.