Multiple choice

Generally, the gain of a transistor amplifier falls at high frequencies due to the

  1. internal capacitances of the device

  2. coupling capacitor at the input

  3. skin effect

  4. coupling capacitor at the output
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A Correct answer
Explanation

The gain of amplifier is

$$A_i = \dfrac{-g_m}{g_o + j\omega C}$$

Thus the gain of a transistor amplifier falls at high frequencies due to the internal capacitance that are diffusion capacitance and transition capacitance.

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