Bipolar Junction Transistors

3. Transistor circuit configuration and transistor characterstics

  • There are three terminals in the transistor i.e emmitter,base and collector
  • In circuits input and output connections are made such that one of the terminals of the transistor is common to both the input and output
  • Keeping this in mind ,transistor can be connected in any of the three following configuration
    1. Common emmitter configuration(CE)
    2. Common base configuration(CB)
    3. common collector configuration( CC)
  • In all these configurations voltage connection are made such thata EB jucntion is always foward baised and CB junction is always reverse biased so that transistor works in the active region
  • Out of all the three transistor configuration CE is most widely used so our discussion would be restricted to this configuration only

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