Physics - Semiconductors Question with Solution | TestHub
In a common emitter amplifier circuit using n-p-n transistor, the phase difference between the input and output voltages will be
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Solution:
In a common emitter amplifier, the input signal is applied between the base and emitter, and the output is taken across the collector and emitter.
The output voltage is given by .
During the positive half cycle of the input signal, the forward bias across the base-emitter junction increases. This causes the base current to increase, which in turn increases the collector current .
As increases, the voltage drop across the collector resistor increases. Consequently, the output voltage decreases.
Thus, a positive input voltage results in a negative output voltage, indicating a phase reversal.
Therefore, the phase difference between the input and output voltages in a common emitter amplifier is .
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