Signal Signals
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A device has an input signal-to-noise ratio of 320 and an output signal signal-to-noise ratio of 10.?
A device has an input signal-to-noise ratio of 320 and an output signal signal-to-noise ratio of 10. Its noise figure in decibel is:
A) 28.57 dB
B) 15.05 dB
C) 29.12dB
D) -14.56 dB
The noise figure of a system can be defined as
NF = frac{mathrm{SNR}_mathrm{in}}{mathrm{SNR}_mathrm{out}}
where SNRin and SNRout are the input and output signal-to-noise ratios, respectively. Alternatively, noise figure may be defined in terms of dB units
NF_{dB} = 10 logleft(frac{mathrm{SNR}_mathrm{in}}{mathrm{SNR}_mathrm{out}}right) = mathrm{SNR}_mathrm{in, dB} - mathrm{SNR}_mathrm{out, dB}
320 -10 is 310 dB, 32.0 - 10.0 is 22 db, so either you gave wrong data or your book uses a different formula.
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