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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: The standard spot noise figure of amplifier is
  • a)
    4 dB
  • b)
    5 dB
  • c)
    7 dB
  • d)
    9 dB
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
An amplifier has an operating spot noise figure of 10 dB when driven b...
= 7.98 or 9.0 dB
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Most Upvoted Answer
An amplifier has an operating spot noise figure of 10 dB when driven b...
Explanation:

To solve this problem, we need to use the formula for the standard spot noise figure of an amplifier, which is given by:

F_std = F - 1 * (Te / To)

Where:
F_std is the standard spot noise figure
F is the operating spot noise figure
Te is the effective noise temperature of the source
To is the reference temperature, usually 290 K

Given:
F = 10 dB (operating spot noise figure)
Te = 225 K (effective noise temperature)

Solution:

Let's substitute the given values into the formula:

F_std = 10 - 1 * (225 / 290)

Simplifying the equation:

F_std = 10 - 0.7759

F_std ≈ 9.2241 dB

Therefore, the standard spot noise figure of the amplifier is approximately 9 dB.

Summary:

The standard spot noise figure of an amplifier can be calculated using the formula F_std = F - 1 * (Te / To), where F is the operating spot noise figure, Te is the effective noise temperature of the source, and To is the reference temperature. By substituting the given values into the formula, we find that the standard spot noise figure of the amplifier is approximately 9 dB.
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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: The standard spot noise figure of amplifier isa)4 dBb)5 dBc)7 dBd)9 dBCorrect answer is option 'D'. Can you explain this answer?
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