System noise temperature of two amplifiers in cascade. Two amplifiers, A₁ and A₂, that have the same bandwidth B are connected in cascade (output of A, goes to input of A₂). Amplifier A, has an effective noise temperature T₁=35K and a gain G₁=30 (numeric ratio). Amplifier A, also has a gain G₂=G₁=30, but its noise temperature is much higher: T₂=500 K. Assume for the purposes of this problem that the source is a 50-2 resistor at OK, so that the only noise to be considered originates in the amplifiers themselves. (a) Calculate the system noise temperature Tys(a) of the system of two cascaded amplifiers with A,'s output feeding A₂'s input. (Hint: Use Eq. 11.42 with T=0.) (b) Now, reverse the order of the amplifiers in the cascade so that A₂'s output feeds the input of A₁. What is the system noise temperature Tsys(b) of the cascade with the higher-noise amplifier placed at the front end? Is this a significant difference? SYS

From your understanding, what is the differnece between a grounding wire and a grounded wire? I answered this way ... Grounding wire is connecting to ground or to a conductive body extends the ground connections. Whereas the grounded wire is connected to earth or to some conducting body that serves inplace of the earth. The replied I got from a classmate "I feel your definitions here aren't exactly different. The first describes connecting to ground and the second to earth. Those are one and the same. Am I missing your meaning, or do I have that correct?" Is he right or am I really missing the subject? Please reply me soon. Thank you

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