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Chapter 4 Characteristics of Transistor ... > 4.16 Explanation of the need of Bias...

4.16 EXPLANATION OF THE NEED OF BIASING VOLTAGES FOR THE TRANSISTOR DEVICES
  • Bipolar Junction Transistor is used as a two-port network or as a four-terminal network. It functions as an amplifying device along with other applications.
  • The name for the device itself is an acronym formed from the two words Transfer and resistor (Transfer + Resistor = Transistor). For achieving different levels of resistance say low resistance at the input port, the input junction of the Transistor is to be forward-biased and to achieve larger resistance at the output port of the Transistor output junction is to be reverse-biased.
  • The different levels of resistances at the input and output ports of the Transistor contribute to the amplifying action of the Transistor. Thus for the Transistor to act as an amplifying device, there is a need for biasing the input (Emitter junction) and output (Collector junction) junctions of the Transistor.


  

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