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The AC power of output signal is obtained by
  • a)
    Input AC voltage
  • b)
    Input DC voltage
  • c)
    DC biasing voltage
  • d)
    Power is generated by transistor itself
Correct answer is option 'C'. Can you explain this answer?
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The AC power of output signal is obtained bya)Input AC voltageb)Input ...
 The Ac power of output signal is obtained by DC biasing voltage of amplifier.
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The AC power of output signal is obtained bya)Input AC voltageb)Input ...
Understanding AC Power Output Signal
When discussing the AC power of an output signal, it is crucial to understand the role of DC biasing voltage in the generation of the AC signal.
The Role of DC Biasing Voltage
- Biasing in Transistors: In electronic circuits, particularly with transistors, DC biasing is essential for setting the operating point of the transistor. This allows the transistor to operate efficiently in the active region.
- AC Signal Generation: The AC output signal is produced when the transistor amplifies the input signal. The DC biasing voltage provides a steady voltage level that allows the transistor to respond to small variations in the input AC signal, effectively amplifying it.
Why Other Options Are Incorrect
- Input AC Voltage: While an input AC voltage can be applied, it does not generate output AC power on its own. It requires a medium (like a transistor) to amplify and produce an output.
- Input DC Voltage: An input DC voltage alone does not produce an AC output signal. It may create a constant level but lacks the oscillatory nature required for AC signals.
- Power Generated by Transistor: While the transistor amplifies signals, it does not generate power by itself. Instead, it uses the DC biasing to modulate the input signal into an AC output.
Conclusion
In summary, the correct answer is option 'C' because the DC biasing voltage is essential for creating the conditions in which the transistor can amplify and produce the desired AC output signal. Understanding this mechanism is crucial in Electrical Engineering applications involving signal processing and amplification.
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