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In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2kΩ is 2V. If the base resistance is 1kΩ and the current amplification of the transistor is 100, the input signal voltage is:

1. 0.1V
2. 1.0V
3. 1mV
4. 10mV

Correct answer: 10mV

Solution

The voltage gain of a CE amplifier is given by the formula Av = β × Rc / Rb, where β is the current gain, Rc is the collector resistance, and Rb is the base resistance. Substituting the given values, Av = 100 × (2000 / 1000) = 200. The input signal voltage is then Vin = Vout / Av = 2V / 200 = 0.01V = 10mV.

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