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Analog Electronics - Engineering

Q1:

The signal input to a given amplifier is made up of 100 mΩ signal power and 1 mΩ noise power. The amplifier contributes an additional 100 mΩ of noise and has a power gain of 20 dB. The input signal-to noise ratio is

A 2

B 10

C 20

D 100

ANS:D - 100

Power Gain = 10 log (S/N),
Where S/N is the signal to noise ratio,
20 = 10 log (S/N).
S/N = 100.