Table of Contents
- 1 When the collector current increases the current gain of transistor?
- 2 How does transistor increase beta?
- 3 What is the most important fact about the collector current *?
- 4 How can collector current increase?
- 5 What is the beta of a transistor in real life?
- 6 What is the relationship between beta and collector current in BJT?
When the collector current increases the current gain of transistor?
The current gain is β = 1 / JC. Here, JC is collector current density. Hence, the value of current gain decreases or increases with respect to the collector current.
How does transistor increase beta?
More specifically, we can increase beta by making the base region narrower and by reducing the ratio of base doping concentration to emitter doping concentration.
How alpha and beta varies with collector current for BJT explain?
The alpha factor (α) of a transistor is the ratio of its collector and emitter currents (α = Ic/Ie), and it is always less than 1 (between 0.5 and 1). The beta (β) or current gain is the ratio of its collector and base currents (β = Ic/Ib), and it is always more than 1.
What is beta in NPN transistor?
The transistor current in an NPN transistor. is the ratio of these two currents ( Ic/Ib ), called the DC Current Gain of the device and is given the symbol of hfe or. nowadays Beta, ( β ). The value of β can be large up to 200 for standard transistors, and it is this large ratio between.
What is the most important fact about the collector current *?
What is the most important fact about the collector current? It is measured in milliampere. It equals the base current divided by the current gain.
How can collector current increase?
Collector Current It increases for larger emitter currents because the larger number of electrons injected into the base exceeds the available holes for recombination so the fraction which recombine to produce base current delines even further. Use of the current gain beta.
What is the relation between α and β in transistor?
β=1−α
What is the relation between current gain alpha and beta for transistor?
β=α1−α
What is the beta of a transistor in real life?
However, real life transistor beta varies with collector current. At low current, beta could be significantly lower. This is due to various leakage mechanism in the transistor; and is highly dependant on the process. At the high current, beta rolls off. This beta roll-off starts at a more predictable current…
What is the relationship between beta and collector current in BJT?
For a bipolar junction transistor (BJT), the relationship of β on collector current is given by this expression: where I b is the base current. Therefore an increase in beta will result in an increase in collector current. The beta value of a BJT is not something that is adjustable.
What happens when the base current of a transistor is increased?
If one increases the base current further, the collector current clamps at this point since the transistor is saturated and the most of the power supply voltage will be dropped on the collector load resistance.
What happens to the collector current when the base current increases?
This means while one increases the base current the collector current will remain unchanged because that the transistor enters the saturation region. At the saturation is open junction CB. Transistor phenomenon arises. Base current also flows through the diode BC. The transistor is in the switch state.