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Exam Questions Papers - Engineering

Q1:

If each stage has a gain of 10 dB and noise figure of 10 dB, then the overall noise figure of a two stage cascade amplifier will be

A 10

B 1.09

C 1.0

D 10.9

ANS:D - 10.9

Overall noise figure F of the system is F = F1 + F1 = F2 = 10 dB = 10 in absolute units g = 10 dB = 10 in absolute units ∴ F = 10 + = 10.9 .