An amplifier has three cascaded stages of amplification, each having available power gain of 10 dB and noise figure of 3 dB. i) ii) Calculate the noise factor (ratio), and noise figure (dB). If the power gain of first and second stage is reduced to 3 dB only while retaining the power gain of third stage, what will be the overall effect on noise figure? If a filter is added at the input of the amplifier which has a passband attenuation of 3 dB, what will be the overall noise figure? iii)