Re: urgent! Noise figure!# EE - 电子工程
n*e
1 楼
See Gray and Meyer, or Razavi, or Pozar's books.
Or this link
http://cp.literature.agilent.com/litweb/pdf/5952-8255E.pdf
See Gray and Meyer, or Razavi, or Pozar's books.
Or this link
http://cp.literature.agilent.com/litweb/pdf/5952-8255E.pdf
p*p
2 楼
Noise figure (NF) is defined as the ratio of input SNR (signal to noise ratio)
and output SNR. Because the a sistem (no matter it's an amplifier or sth else)
generate noise itself, input SNR is always greater than output SNR. Therefore,
NF is alway bigger than 1.
NF is related to noise temperature (Tn) by: NF=Tn/293+1. Tn can be measured
using Y factor method. Use two noise sources: hot source at high temperature
(Th), and cold source at low temperature (Tl). And measure the output noise
power.
and output SNR. Because the a sistem (no matter it's an amplifier or sth else)
generate noise itself, input SNR is always greater than output SNR. Therefore,
NF is alway bigger than 1.
NF is related to noise temperature (Tn) by: NF=Tn/293+1. Tn can be measured
using Y factor method. Use two noise sources: hot source at high temperature
(Th), and cold source at low temperature (Tl). And measure the output noise
power.
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