Electronics and Communication Engineering - Communication Systems - Discussion
Discussion Forum : Communication Systems - Section 5 (Q.No. 16)
16.
AM amplifier having noise figure of 20 dB and available power gain of 15 dB is followed by a mixer circuit having noise figure of 9 dB. The overall noise figure as referred to input in dB is
Answer: Option
Explanation:
.
Discussion:
2 comments Page 1 of 1.
Indiabixer said:
1 decade ago
10^(20/10) + ((10^(9/10)-1)/10^(15/10)) = 100.22 = 20 dB.
AL MapuaU said:
3 years ago
20 dB must be the first stage gain, and 9 db is the next stage.
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