Question

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

Answer 1

Collector resistance, RC = 2 kΩ = 2000 Ω
Audio signal voltage across the collector resistance, V = 2 V Current amplification factor of the transistor, β = 100
Base resistance, R_B = 1 kΩ = 1000 Ω
Input signal voltage = V_i
Base current = I_B
We have the amplification relation as:

Therefore, the input signal voltage of the amplifier is 0.01 V. Base resistance is given by the relation:

Therefore, the base current of the amplifier is 10 μA.