Contents
How does a transistor works in saturation region?
A transistor in saturation mode acts like a short circuit between collector and emitter. In saturation mode both of the “diodes” in the transistor are forward biased. That means VBE must be greater than 0, and so must VBC. In other words, VB must be higher than both VE and VC.
What is the saturation region of transistor?
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.
How do you determine the region of a transistor?
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 |
|---|---|---|
| Forward biased | Reverse biased | Active region |
| Reverse biased | Forward biased | Inverse active region |
| Reverse biased | Reverse biased | Cutoff region |
When does the transistor operate in the saturation region?
The transistor operates in saturation region when both the emitter and collector junctions are forward biased. As it is understood that, in the saturation region the transistor tends to behave as a closed switch, we can say that,
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.
Which is the active region of a transistor?
The transistor operates in active region when the emitter junction is forward biased and collector junction is reverse biased. In the active state, collector current is β times the base current, i.e., This is the region in which transistor tends to behave as a closed switch. The transistor has the effect of its collector and Emitter being shorted.
Why are bipolar transistors used in logic circuits?
Therefore the art of using bipolar transistors in logic circuits is to keep them as close to saturation as you can (low Vce means good logic levels) without incurring the speed penalty of saturation – as explained here.