bipolar transition The transistor has three region named emitter,base and collector. The base is much thinner than other regions. Emitter is heavily doped so it can inject large amount of carriers into the base. Base is lightly doped so it can pass most of the carrier to the collector. Collector is moderately doped

1. PRESENTATION
TOPIC
BIPOLAR JUNCTION
TRANSISTORS
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2. INTRODUCTION
• The Basic of electronic system nowadays is
Semiconductor Devices.
• The famous and commonly use of this device is BJTs.
• It can be used as an amplifier and logic switches.
• BJT consists of three terminals:
◆ collector : C
◆ base : B
◆ emitter : E
• Two types of BJT : NPN and PNP

3. IMPORTANT FACTORS TO BE
REMEMBERED:-
• The transistor has three region named emitter,base and collector.
• The base is much thinner than other regions.
• Emitter is heavily doped so it can inject large amount of carriers into
the base.
• Base is lightly doped so it can pass most of the carrier to the
collector.
• Collector is moderately doped.

4. •The junction between emitter and base is
called emmiter-base junction (emitter diode)
and junction between base and collector is
called collector-base junction (collector
diode).
•The emitter diode is always forward biased
and collector diode is reverse biased.
•The resistance of emmiter diode is very
small(forward) and resistance of collector

5. TRANSISTOR SYMBOL

6. TRANSISTOR CURRENTS

7. TRANSISTOR OPERATING
MODES
◆ Active Mode:
-Base-Emitter junction is forward and Base-Collector junction is reverse
biased.
◆ Saturation Mode:
-Both Base-Emitter and Base-Collector junctions are in forward biased.
◆ Cutt-off Mode:
-Both junctions are reverse biased.
◆ Inverted Mode:
- Base-Emitter junction is reverse and Base-Collector junction is forward

8. TRANSISTOR
CONNECTION
● Transistor can be connected in a circuit in
following three ways:-
1.Common Base(CB)
2.Common Emitter (CE)
3.Common Collector (CC)

9. THANK YOU