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Simple Circuit

For a CE-tran...

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.

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Solution

Collector resistance, R_C = 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:

Voltage amplification

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.

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