Module 21: Noise Figure

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  1. Professor David S. Ricketts
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Module 21: Noise 0:10:36

Module 21: Noise Figure

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Комментарии
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Thanks and great video. At 6:17, in the Friis formula for cascaded stages, I'd like to point out that the notation 'NF' in the formula is Noise Factor, not Noise Figure. Noise Figure is defined as the dB value of Noise Factor. Maybe it's better to use 'F' as notation, referring to noise factor.

yifengyuan
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Never seen the formula for Noise Factor explained as intuitively as you have, _why_ we subtract 1 and _why_ later noise sources have decreasing contribution to total noise. Thanks

lightningllama
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Thanks for posting this clear and simple explanation of noise figure and how it applies to design!

chzn
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just a quick correction, SNR at the receiver's output is less than the SNR at the input

Ash-p
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Omg! Finally someone who explained NF without complicating things! Thank you

Rainbient
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Is it correct at 0:21? Isnt SNR at input is larger than the SNR at the output?

mjef
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Excellent analysis! Thanks a lot. I would like to emphasize though the difference between Noise Figure (expressed in dB) and Noise Factor (linear domain). You do not explicitly define them along the way which causes confusion. However this is a common problem across most websites trying to explain Noise Figure. When you re saying NF-1 you are referring to Noise Factor, not Noise Figure.

naftilos
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I was so confused when you said the SNR out is larger than the SNR in

רותדיין-צט
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At 3:06 you say: [NF-1 = added noise] but in previous lecture you said [NF-1 = added noise/ Noise in] . what is the correct one?

yanirelmalih