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DC bias is adjusted greater than its cut-off value so that the output current flow for less than half of the input voltage cycle, in:
- a)Class A amplifier
- b)Class B amplifier
- c)Class C amplifier
- d)Class AB amplifier
Correct answer is option 'C'. Can you explain this answer?
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Understanding DC Bias in Amplifiers
DC biasing is crucial in amplifier design as it sets the operating point of the transistor. In the context of the question, we are particularly focused on Class C amplifiers.
Class C Amplifier Characteristics
- Class C amplifiers are designed for high-efficiency applications.
- They operate with a DC bias level greater than the cut-off value, which ensures that the output current flows for less than half of the input voltage cycle.
- This configuration results in a conduction angle of less than 180 degrees.
Key Features of Class C Operation
- Efficiency: Class C amplifiers can achieve efficiencies above 80% due to their short conduction time.
- Signal Distortion: Since they only conduct for a portion of the input cycle, Class C amplifiers often introduce significant distortion.
- Ideal for RF Applications: They are commonly used in radio frequency (RF) applications where high efficiency is paramount, such as in transmitters.
Comparison with Other Classes
- Class A: Conducts for the entire input cycle (360 degrees), making it less efficient.
- Class B: Conducts for half of the input cycle (180 degrees), providing better efficiency than Class A.
- Class AB: Operates between Class A and Class B, conducting slightly more than half the cycle, which improves linearity while maintaining efficiency.
Conclusion
In summary, the correct answer is Class C amplifier, as it is specifically designed to operate with a DC bias above its cut-off value, allowing current to flow for less than half of the input voltage cycle, making it ideal for high-efficiency applications.
DC biasing is crucial in amplifier design as it sets the operating point of the transistor. In the context of the question, we are particularly focused on Class C amplifiers.
Class C Amplifier Characteristics
- Class C amplifiers are designed for high-efficiency applications.
- They operate with a DC bias level greater than the cut-off value, which ensures that the output current flows for less than half of the input voltage cycle.
- This configuration results in a conduction angle of less than 180 degrees.
Key Features of Class C Operation
- Efficiency: Class C amplifiers can achieve efficiencies above 80% due to their short conduction time.
- Signal Distortion: Since they only conduct for a portion of the input cycle, Class C amplifiers often introduce significant distortion.
- Ideal for RF Applications: They are commonly used in radio frequency (RF) applications where high efficiency is paramount, such as in transmitters.
Comparison with Other Classes
- Class A: Conducts for the entire input cycle (360 degrees), making it less efficient.
- Class B: Conducts for half of the input cycle (180 degrees), providing better efficiency than Class A.
- Class AB: Operates between Class A and Class B, conducting slightly more than half the cycle, which improves linearity while maintaining efficiency.
Conclusion
In summary, the correct answer is Class C amplifier, as it is specifically designed to operate with a DC bias above its cut-off value, allowing current to flow for less than half of the input voltage cycle, making it ideal for high-efficiency applications.
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