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Bipolar Junction Transistor: Principles, Operation, and Applications, Lecture notes of Basic Electronics
An overview of the bipolar junction transistor (bjt), its structure, and the two modes of operation. It explains the basic transistor principle and introduces the three main types of bjt configurations: common-emitter, common-collector, and common-base. The document also discusses the amplifier function and the block diagram of an electronic system, focusing on the role of the bjt in audio systems.
Typology: Lecture notes
2014/2015
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Bipolar Junction Transistor (BJT)
Has three separately doped regions and two pn junctions.
A single pn junction has two modes of operation – forward bias
- reverse bias
Basic transistor principle:
The voltage between two terminals controls the current through the third terminal.
Since a transistor has two pn junctions
=> four possible bias combinations
Amplifier – forward-active operating mode/
active mode
Active mode – BE is forward biased, and
BC is reverse biased
Block diagram of an electronic system (audio system)
Power Supply
Transducer^ Input^ Amplifier Transducer^ Output
- CD Player
- Microphone
- Receiver
- Speakers
DC Low^ power signal power
High signal power
Common-emitter
Common-collector
Common-base