Question
If SNRi is the input SNR of a system in dB, SNRo is the
output SNR of a system in dB, then which of the below defines the noise figure (NF) in dB?Solution
The Noise Figure (NF) in dB is defined as the degradation of signal-to-noise ratio from input to output of a system. Mathematically, NF (dB) = SNRi(dB) – SNRo(dB) This means it tells how much worse the SNR becomes as the signal passes through the device.
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