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When two networks are connected in series, its composite noise figure can be given as

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When two networks are connected in series, its composite noise figure can be given as

(a) F1+(F2-1)/G1

(b) F1-(F2-1)/G1

(c) F2+(F1-1)/G1

(d) F1G1+(F2-1)

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I would like to ask this question from Noise Parameters topic in chapter Communication Link Analysis of Digital Communications

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Right answer is (a) F1+(F2-1)/G1

Explanation: When two networks are connected in series, the composite noise figure can be written as F1+(F2-1)/G1.

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