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Common Data Questi on s 29 to 30
Q.
Two amplifiers A and B are to be connectd in cascade. Find out the order in which the amplifiers must be connected to minimise the noise. Amplifiers A has noise factor of 1.5, gain of 10 dB and amplifier B has noise figure 2 dB, gain of 15 dB.
  • a)
    B should be follower of A
  • b)
    A should be follower of B
  • c)
    No problem whichever the follower
  • d)
    None
Correct answer is option 'B'. Can you explain this answer?
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Understanding Noise in Amplifiers
When connecting amplifiers in cascade, minimizing noise is crucial for optimal performance. The noise figure (NF) and gain of each amplifier play a significant role in determining the overall system noise.
Given Parameters
- Amplifier A
- Noise Factor: 1.5
- Gain: 10 dB
- Amplifier B
- Noise Figure: 2 dB
- Gain: 15 dB
Calculating the Overall Noise Figure
To find the overall noise figure of the system, we can use Friis' formula for cascaded amplifiers. The formula considers the order of amplifiers and their individual gains and noise figures.
Noise Figure Calculation
1. If A is the first amplifier (follower of A)
- NF_total = NF_A + (NF_B - 1) / Gain_A
- This results in a higher overall noise figure due to Amplifier A's noise factor.
2. If B is the first amplifier (follower of B)
- NF_total = NF_B + (NF_A - 1) / Gain_B
- In this case, since B has a lower noise figure, the overall noise is reduced.
Conclusion
By connecting Amplifier A as the follower of Amplifier B, we effectively minimize the overall noise in the system. Therefore, the correct answer is:
- Option B: A should be the follower of B
This configuration optimizes the performance by leveraging the lower noise figure of Amplifier B, ensuring a cleaner signal is amplified further by Amplifier A.
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Common Data Questi on s 29 to 30Q.Two amplifiers A and B are to be connectd in cascade. Find out the order in which the amplifiers must be connected to minimise the noise. Amplifiers A has noise factor of 1.5, gain of 10 dB and amplifier B has noise figure 2 dB, gain of 15 dB.a)B should be follower of Ab)A should be follower of Bc)No problem whichever the followerd)NoneCorrect answer is option 'B'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2025 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about Common Data Questi on s 29 to 30Q.Two amplifiers A and B are to be connectd in cascade. Find out the order in which the amplifiers must be connected to minimise the noise. Amplifiers A has noise factor of 1.5, gain of 10 dB and amplifier B has noise figure 2 dB, gain of 15 dB.a)B should be follower of Ab)A should be follower of Bc)No problem whichever the followerd)NoneCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Common Data Questi on s 29 to 30Q.Two amplifiers A and B are to be connectd in cascade. Find out the order in which the amplifiers must be connected to minimise the noise. Amplifiers A has noise factor of 1.5, gain of 10 dB and amplifier B has noise figure 2 dB, gain of 15 dB.a)B should be follower of Ab)A should be follower of Bc)No problem whichever the followerd)NoneCorrect answer is option 'B'. Can you explain this answer?.
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