Ncert Exercises & Solutions

14.9: For a CE-transistor amplifier, the audio signal voltage across the collected resistance of 2 $k Ω is$ 2 V. Suppose the current amplification factor of the transistor is 100, find the input signal voltage and base current, the base resistances 1 kΩ.

Hint: $I_{B}=\frac{I_{C}}{\beta }$
Step 1: Find the input voltage.
$\frac{V_{0}}{V_{i} }=\frac{R_{0}}{R_{i} }\times\beta$
$\Rightarrow~V_{i} =10~ mV$
Step 2: Find collector current.
$I_{C}=\frac{V_{0}}{R_{0}}=\frac{2}{2}=1~mA$
Step 3: Find base current.
$I_{B}=\frac{I_{C}}{\beta }=\frac{1\times10^{-3}}{100}=~10~\mu A$

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