Question

For a CE-transistor amplifier, the audio signal voltage across the collected resistance of $2k$$\Omega$ is $2V$. Suppose the current amplification factor of the transistor is $100$, find the input signal voltage and base current, if the base resistance is $1k$$\Omega$.

Answer 1

the resistance connected is the circuit is $R=2000\Omega$

The voltage across the amplifier $,V=2V$

The current amplification factor $\beta =100$

Base resistance is $R_B=1000\Omega$

Input signal voltage is $V_i$, base current is $I_B$

$\frac{V}{V_i}=\beta \frac{R}{R_B}$

$V_i=0.01$

And we know that

$R_B=\frac{V_i}{I_B}⟹I_B=10\mu A$