Physics - Semiconductors Question with Solution | TestHub

Output voltage $V_o=4\text{V}$

Collector resistance $R_c=2\text{k}\Omega =2000\Omega$

Collector current $I_c=\frac{V_o}{R_c}=\frac{4}{2000}=2\times 10^{-3}\text{A}$

Current amplification factor $\beta =100$

Base current $I_b=\frac{I_c}{\beta }=\frac{2\times 10^{-3}}{100}=2\times 10^{-5}\text{A}$

Base resistance $R_b=1\text{k}\Omega =1000\Omega$

Input voltage $V_i=I_b{R}_b=(2\times 10^{-5})\times 1000=2\times 10^{-2}\text{V}=20\text{mV}$

Answer: $20\text{mV}$