Diffusion capacitance function in hybrid-π model

Q.  Which capacitance/s in hybrid π model represent/s the storage of excess minority carriers at the base emitter junction?
- Published on 23 Sep 15

a. Diffusion capacitance
b. Transition capacitance
c. Both a and b
d. None of the above

ANSWER: Diffusion capacitance

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    Discussion

  • Nishant Singh    -Posted on 25 Apr 17
    Can i know the source of your knowledge as ur concepts are very strong.
  • Satyawati   -Posted on 30 Sep 15
    Two capacitances are present in hybrid – π model. They are diffusion & transition capacitances.

    From the configuration of hybrid- π model, the capacitance which is provided by forward-biased base-to-emitter junction is known as 'Diffusion capacitance'.

    The significant role of diffusion capacitance is to represent the excess minority carrier storage at the base emitter junction. It is usually expressed as Ce or C'be.

    Conversely, the capacitance which is offered by the reverse-biased collector base junction is termed as 'Transition capacitance'. It is also regarded as collector junction barrier potential & hence normally expressed as Cc or C'cb .

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