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
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.
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.
Thanks for posting this clear and simple explanation of noise figure and how it applies to design!
Omg! Finally someone who explained NF without complicating things! Thank you
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
just a quick correction, SNR at the receiver's output is less than the SNR at the input
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.
Is it correct at 0:21? Isnt SNR at input is larger than the SNR at the output?
user16307 good catch!!! I misspoke. The input SNR is of coarse always larger.
I was so confused when you said the SNR out is larger than the SNR in
SNR at the output will be lower than at the input. This is because additional noise form the stage ( amplifier) is added in the "original" noise
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.
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?
than you
Nice explained. #discreteoptical