NEET-XII-Physics
14: Semiconductor Electronics: Materials Devices and Simple Circuits
- #9For a CE-transistor amplifier, the audio signal voltage across the collected resistance of 2 k``\Omega`` 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 k``\Omega``.
Ans : Collector resistance, RC = 2 k``\Omega`` = 2000 ``\Omega``
Audio signal voltage across the collector resistance, V = 2 V
Current amplification factor of the transistor, β = 100
Base resistance, RB = 1 k``\Omega`` = 1000 ``\Omega``
Input signal voltage = Vi
Base current = IB
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.