physicscatalyst.com logo






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





Class 12 Maths Home page Class 12 Physics Home page