Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Effective Noise Power Spectral Density

  1. Jun 30, 2011 #1
    How to calculate the effective noise power spectral density,
    when a noise factor of 3 if given and if said to make any assumptions.

    We know Effective Noise Temperature N = k.Te.B
    I'm assuming it as Te = 290 K x (10 NF/10 - 1) and what about 'B'?
     
  2. jcsd
  3. Jun 30, 2011 #2

    uart

    User Avatar
    Science Advisor

    A noise factor of 3 means that the effective noise power, referred to the input, is 3 times that of the actual input noise power. I think you've got to make a lot of assumptions to make any conclusions other than that.
     
  4. Jun 30, 2011 #3
    "B" is bandwidth. The wider your bandwidth the more noise you'll have. For a 1 Hz bandwidth the effective noise power is -174 dBm. For a 1 kHz bandwidth it is -144 dBm, a 30 dB difference both between 1 Hz and 1000 Hz and between -174 and -144 dBm.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Effective Noise Power Spectral Density
  1. Spectral density (Replies: 1)

Loading...