Define signal to noise ratio .Explain the effect of cascade connection on a signal to noise ratio. An amplifier with 10dB noise figure and 4 dB power gain is cascaded with a second amplifier which has a 10dB power gain .What is overall noise figure and power gain.

Mumbai University > Information Technology > Sem 3 > Principles of analog and digital communication

Marks:- 5M

Year:- Dec 2015

• Noise Figure (NF) is a measure of how much a device (such an amplifier) degrades the Signal to Noise ratio (SNR).

• Noise Factor (linear not dB) of a receiver is the ratio of the SNR at its input to the ratio of the SNR at its output.

• Note that SNR …