MHT CET · Physics · Semiconductors
When n-p-n junction transistor is used as an amplifier in common emitter mode,
- A the input impedance is high and the output impedance is low.
- B the base emitter junction is reverse biased.
- C input signal is applied between the base and emitter and output is obtained between collector and emitter.
- D the input voltage and output voltage are in phase.
Answer & Solution
Correct Answer
(C) input signal is applied between the base and emitter and output is obtained between collector and emitter.
Step-by-step Solution
Detailed explanation
Common Emitter Configuration:
In this configuration, the emitter terminal is common to both the input and output sides of the circuit.
The input signal is applied across the base-emitter junction.
The output is taken across the collector-emitter junction.
Biasing:
For proper operation, the base-emitter junction should be forward-biased, not reverse-biased as mentioned in Option B. Therefore, Option B is incorrect.
Phase Relationship:
The output voltage is inverted with respect to the input voltage, meaning they are 180 degrees out of phase. Hence, Option D is incorrect.
Impedance Characteristics:
The input impedance is generally low to moderate, not high, and the output impedance is generally moderate to high. Thus, Option A is incorrect.
In summary, the common emitter configuration is widely used due to its ability to amplify the input signal with phase inversion, making Option C the accurate description.
In this configuration, the emitter terminal is common to both the input and output sides of the circuit.
The input signal is applied across the base-emitter junction.
The output is taken across the collector-emitter junction.
Biasing:
For proper operation, the base-emitter junction should be forward-biased, not reverse-biased as mentioned in Option B. Therefore, Option B is incorrect.
Phase Relationship:
The output voltage is inverted with respect to the input voltage, meaning they are 180 degrees out of phase. Hence, Option D is incorrect.
Impedance Characteristics:
The input impedance is generally low to moderate, not high, and the output impedance is generally moderate to high. Thus, Option A is incorrect.
In summary, the common emitter configuration is widely used due to its ability to amplify the input signal with phase inversion, making Option C the accurate description.
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