GATE 2016 Electronics & Communication PYQ

Question

An antenna pointing in a certain direction has a noise temperature of 50K. The ambient temperature is 290K. The antenna is connected to a pre-amplifier that has a noise figure of 2dB and an available gain of 40 dB over an effective bandwidth of 12 MHz. The effective input noise temperature T_e for the amplifier and the noise power P_ao at the output of the preamplifier, respectively, are

Accepted Answer

$${T_e} = 169.36K\,\,\,$$ and $${P_{ao}} = 3.73 	imes {10^{ - 10}}\,\,W$$

Answer

$${T_e} = 170.8K\,\,\,$$ and $${P_{ao}} = 4.56 	imes {10^{ - 10}}\,\,W$$

Answer

$${T_e} = 182.5K\,\,\,$$ and $${P_{ao}} = 3.85 	imes {10^{ - 10}}\,\,W$$

Answer

$${T_e} = 160.62K\,\,\,$$ and $${P_{ao}} = 4.6 	imes {10^{ - 10}}\,\,W$$