Table of Contents
- 1 What is the principle of bipolar junction transistor action?
- 2 How does a bipolar transistor amplify?
- 3 What are the operating regions of a transistor?
- 4 What is a bipolar transistor amplifier?
- 5 Which electrical quantity controls the operation of the bipolar transistor device?
- 6 What are the three operating condition of transistor?
What is the principle of bipolar junction transistor action?
Bipolar transistors conduct current using both electrons and holes in the same device. Operation of a bipolar transistor as a current amplifier requires that the collector-base junction be reverse biased and the emitter-base junction be forward biased.
How does a bipolar transistor amplify?
A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.
What are the operating regions of a transistor?
A bipolar junction transistor (BJT) has three operating regions:
- Cut off ( for NPN BJT)
- Active region ( for NPN)
- Saturated ( for NPN)
How do you determine the operating 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 |
What bipolar means?
Bipolar disorder (formerly called manic-depressive illness or manic depression) is a mental disorder that causes unusual shifts in mood, energy, activity levels, concentration, and the ability to carry out day-to-day tasks. There are three types of bipolar disorder.
What is a bipolar transistor amplifier?
A bipolar transistor can amplify more than one signal. A bipolar amplifier is a signal amplifier that has the ability to emit more than one output signal. The output is determined by either the positive or negative polarity of the signal upon input to the amplifier circuit.
Which electrical quantity controls the operation of the bipolar transistor device?
Technically speaking, BJT is a three-terminal device with an Emitter, collector, and a base pin, the current flow through the emitter and collector are controlled by the amount of current applied to the base.
What are the three operating condition of transistor?
The transistor can be operated in three modes: Cut-off mode. Saturation mode. Active mode.
What region does a transistor operate in?
The region between cut off and saturation is known as active region. In the active region, collector-base junction remains reverse biased while base-emitter junction remains forward biased. Consequently, the transistor will function normally in this region.
What are the four operating regions in BJT?
The regions of a BJT are called emitter, base, and collector. A discrete transistor has three leads for connection to these regions.