Multiple choice

What is the minimum detectable signal of a spectrum analyser with a noise figure of 20db using a 1KHz, 3db filter?

    • 124 dbm
    • 120 dbm
    • 144 dbm
    • 94
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A Correct answer
Explanation

Noise Figure (NF) = 20 db Bandwidth (BW) = 1 kHz Using equation MDS = - 114 dbm + 10 log BW/1MHz +NFMDS                                    = - 114dbm + 10 log 1kHz/1 MHz +20 - 94 + 10 log (1 x 103)/(1 x 106)                                  = - 94 +10 x (- 3)                                   = - 124 dbm 

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