NoiseFigure new
= sqrt ( ( NF1^2 - 1 ) + ( NF2^2 - 1 ) + ( NF3^2 - 1 ) + ... + 1 )
where all noise figures are ratios and referenced to a
single location.
A few points:
1 Definition:
Noise Figure is the ratio of increased noise in a system above the expected
level of
I may not have been as clear as desirable in the line where I say, "N = -67
dBuV/Hz." That is based on a noise figure numerically equal to one, or 0
dB. To give a numerical example, say it is a radiated measurement where you
have determined that the limit is 40 dBuV/m (30 - 88 MHz), t
this
level N. Then basic statistical thermodynamic theory says that N = kTBF,
where K is Boltzman's constant (the ideal gas law constant divided by
Avogadro's number), T is absolute temperature in Kelvin, B is bandwidth in
Hertz, and F is the noise figure. At room temperature, 25 degre
Hi all
It may not be purely EMC question, actually it is RF related, but I am sure
the experts here can answer my questions.
We all know that we need to have a pre-amp. that is as lower noise figure as
possible, but how low it is enough or how it is related to the noise floor
viewed by a
>I am trying to determine the maximum noise figure that I can have for my
1-16.5 GHz EMC receiver system which includes the horn, mixer for above 18
GHz, preamp, cable and spectrum analyzer. I know the following:
* Signal level received by the horn
* Gain through the sys
I am trying to determine the maximum noise figure that I can have for my
1-16.5 GHz EMC receiver system which includes the horn, mixer for above 18
GHz, preamp, cable and spectrum analyzer. I know the following:
* Signal level received by the horn
* Gain through the system
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