If the noise factor of an ideal amplifier expressed in db, then it is
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Noise Figure of an amplifier , in simple language tells about the amount of noise introduced in any part of the system. Mathematically, it is equal to the ratio of input SNR to output SNR. For an ideal amplifier , when a signal passes through the system, then no noise is added to the signal and input SNR is equal to the output SNR and hence NF for ideal amplifier is 1 or 0 db. But, practically this is not the case and NF is always greater than unity as output SNR is always worst or less than the input SNR because of addition of noise.
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