Multiple choice

The gain of a BJT amplifier drops down sharply when the input signal frequency is raised to a very high value. Why does it happen?

  1. Internal capacitance of the BJT

  2. Coupling capacitor at the base of the BJT

  3. Coupling capacitor at collector of the BJT

  4. Biasing resistors

  5. By pass capacitor

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A Correct answer
Explanation

The junction layers at BE, BC and the portion at CE offers capacitive effect to the flow of electrons in BJT when properly exited. This capacitive effect becomes prominently high to reduce the flow of electrons during the high frequency signal's cycle time. Due to this, the gain falls (current reduces due to decrease in flow of electrons from C to E).