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Among these which one is correct about the characteristics of the transistor?

  • The input impedance of a BJT is determined by the resistance of the base-emitter junction, which behaves like a diode.
  • The base-emitter junction has a forward voltage drop, and to drive current into the base, the voltage applied to the base must be higher than this forward voltage drop.
  • As a result, the input impedance of a BJT is relatively low, typically in the range of a few hundred ohms to a few kilohms.
  • This low input impedance is a characteristic of BJTs and is one of the factors that limits their performance in high-frequency applications.