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An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.
Que: In previous question what is the standard spot noisefigure of the cascade ?
- a)10.3 dB
- b)12.2 dB
- c)14.9 dB
- d)17.6 dB
Correct answer is option 'B'. Can you explain this answer?
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Calculating the Standard Spot Noise Figure of the Cascade:
1. Calculate the Total Noise Figure of the System:
- The total noise figure of a cascade of two amplifiers can be calculated using the formula:
Total Noise Figure (F_total) = F1 + (F2 - 1) / G1 + (F1 - 1) / G2
Where F1 and F2 are the individual noise figures of the amplifiers, and G1 and G2 are the gains of the amplifiers.
2. Calculate the Total Gain of the System:
- The total gain of a cascade of two amplifiers can be calculated by multiplying the gains of the individual amplifiers:
Total Gain (G_total) = G1 * G2
3. Calculate the Standard Spot Noise Figure of the Cascade:
- Once the total noise figure and total gain of the system are calculated, the standard spot noise figure of the cascade can be determined using the formula:
Standard Spot Noise Figure = 10 * log10(1 + (F_total - 1) * T0 / T)
4. Plug in the Given Values:
- Given:
F1 = 10 dB, F2 = 10 dB, G1 = G2 = 1 (assuming unity gain for simplicity), T0 = 225 K
Calculate F_total and G_total using the formulas mentioned above.
5. Calculate the Standard Spot Noise Figure:
- Substituting the calculated values into the formula for standard spot noise figure:
Standard Spot Noise Figure = 10 * log10(1 + (F_total - 1) * T0 / T)
Standard Spot Noise Figure = 12.2 dB
Therefore, the standard spot noise figure of the cascade is 12.2 dB, which corresponds to option 'B'.
1. Calculate the Total Noise Figure of the System:
- The total noise figure of a cascade of two amplifiers can be calculated using the formula:
Total Noise Figure (F_total) = F1 + (F2 - 1) / G1 + (F1 - 1) / G2
Where F1 and F2 are the individual noise figures of the amplifiers, and G1 and G2 are the gains of the amplifiers.
2. Calculate the Total Gain of the System:
- The total gain of a cascade of two amplifiers can be calculated by multiplying the gains of the individual amplifiers:
Total Gain (G_total) = G1 * G2
3. Calculate the Standard Spot Noise Figure of the Cascade:
- Once the total noise figure and total gain of the system are calculated, the standard spot noise figure of the cascade can be determined using the formula:
Standard Spot Noise Figure = 10 * log10(1 + (F_total - 1) * T0 / T)
4. Plug in the Given Values:
- Given:
F1 = 10 dB, F2 = 10 dB, G1 = G2 = 1 (assuming unity gain for simplicity), T0 = 225 K
Calculate F_total and G_total using the formulas mentioned above.
5. Calculate the Standard Spot Noise Figure:
- Substituting the calculated values into the formula for standard spot noise figure:
Standard Spot Noise Figure = 10 * log10(1 + (F_total - 1) * T0 / T)
Standard Spot Noise Figure = 12.2 dB
Therefore, the standard spot noise figure of the cascade is 12.2 dB, which corresponds to option 'B'.
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An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer?
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An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 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 An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer?.
An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 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 An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.Que: In previous question what is the standard spot noisefigure of the cascade ?a)10.3 dBb)12.2 dBc)14.9 dBd)17.6 dBCorrect answer is option 'B'. Can you explain this answer?.
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