problem 1: State the noise figure of an amplifier. Compute the overall noise figure of ‘n’ cascaded networks, having gains A_{1}, A_{2}……….A_{n} and individual noise figure source, F_{1}, F_{2},……..F_{n} correspondingly.
problem 2: Describe in brief the terms noise figure and noise temperature.
problem 3: If F_{1} and F_{2} are the noise figures and G_{1} and G_{2} are available power gains of two amplifiers in cascaded, illustrate that the overall noise figure F is given by F = F_{1} + F_{2} -1/G
problem 4: State the noise figure of an amplifier. Compute the noise figure of a vacuum tube amplifier supposing appropriate parameter.
problem 5: Describe different kinds of noise in:
a) Junction diodes.
b) Junction transistors.
problem 6: describe an experimental setup for the measurement of noise figure showing that the noise figure F is independent of the network gain and input resistance.
problem 7: Describe the Sources of noise in semiconductors. Determine the noise figure of grounded base transistor amplifier.
problem 8: Illustrate that the noise figures of grounded cathode, grounded grid and grounded plate vacuum tube amplifiers are approximate the similar.
problem 9: prepare descriptive notes on the given:
a) Minimum noise network
b) External noise
problem 10: What are various types of non-man made noise which might arise in a communication system? Describe the origin and nature of each kind.