Transistor (Bipolar Junction Transistor - BJT) Explained
Timestamps for various topics covered in this video are as follows:
0:13 Introduction,
2:43 What is BJT?,
5:12 Construction of BJT,
6:03 Different Regions of Operation of BJT (Active, Saturation, Cut-off, and Reverse Active)
11:13 Different Configurations (CE, CB, and CC),
12:09 BJT used as a Switch,
13:32 BJT used as an Inverter (Digital Applications),
15:11 BJT used as an Amplifier (Analog Applications),
19:53 Gain of an Amplifier (Voltage Gain, and Current Gain 'β'),
21:37 hFE value of a BJT.
Bipolar Junction Transistor (BJT), and its different regions of operation, configurations, working as a switch, Inverter and Amplifier are briefly explained.
What is Bipolar Junction Transistor (BJT)?
Bipolar Junction Transistor is a 3 terminal semiconductor device that can act as a conductor or insulator based on the applied Input signal. Due to this property, it can be used as a switch or as an amplifier in electronic circuits.
The term Bipolar indicates that both Holes and Electrons (unlike FET) contribute to the flow of current.
Construction of BJT:
The BJT consists of the three doped regions. They are known as Emitter, Base, and Collector.
And based on the doping of the three regions, it is known as either NPN or PNP transistor.
In BJT, Emitter is heavily doped, Base is lightly doped and Collector is moderately doped.
The width of the Base region is much smaller than the other two regions.
The job of the Emitter region is to supply the electrons (that's why it is known as the Emitter)
While the collector region collects the electrons supplied by the emitter.
Different Regions of Operation of BJT:
1) Active Mode (BE Junction is Forward Biased, CB junction is reverse biased)
2) Cut-off Mode (Both BE and BC junctions are reverse biased)
3) Saturation Mode ( Both BE and BC junctions are forward-biased )
4) Reverse Active Mode (BE junction is reverse biased, BC junction is forward biased)
Different operating Configurations of BJT
When BJT is used as an amplifier, it can be configured in the following configurations:
1) Common Emitter (CE ) Configuration
2) Common Base (CB) Configuration
3) Common Collector (CC) Configuration
This video will be helpful to everyone in understanding the basics of Bipolar Junction Transistors (BJT).
The link for the other useful videos:
1) Transistors and SMD Transistors Coding Schemes
• Transistors and SMD Transistors Coding
2) PN Junction Diode
• PN Junction Diode and V-I Characteristics ...
3) Semiconductors (P-type and N-type)
• Semiconductor: P-Type and N-Type, Intrinsi...
4) Avalanche Breakdown and Zener Breakdown
• Diode and Diode Applications
5) Zener Diode as a Voltage Regulator
• Zener Diode as a Voltage Regulator, (Line ...
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