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(b) Amplifier “A" has gain 30DB and noise figure 3.7 dB at the frequency of interest. Amplifier “B" has gain 20 dB and noise figure 8.4 dB at the same frequency. Input and output impedances are 50 Q throughout. I. When used in cascade, what is the combined noise figure? I. From the answer obtained for question 1(b) i, what can you say about the combined noise figure when compared to the large noise figure given in second stage?

(b) Amplifier “A" has gain 30DB and noise figure 3.7 dB at the frequency of interest. Amplifier “B" has gain 20 dB and noise figure 8.4 dB at the same frequency. Input and output impedances are 50 Q throughout. I. When used in cascade, what is the combined noise figure? I. From the answer obtained for question 1(b) i, what can you say about the combined noise figure when compared to the large noise figure given in second stage?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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(b) Amplifier “A" has gain 30DB and noise figure 3.7 dB at the frequency of interest. Amplifier “B" has gain 20 dB and noise figure 8.4 dB at the same frequency. Input and output impedances are 50 Q throughout. I. When used in cascade, what is the combined noise figure? From the answer obtained for question 1(b) i, what can you say about the combined noise figure when compared to the large noise figure given in second stage? I.
Transcribed Image Text:(b) Amplifier “A" has gain 30DB and noise figure 3.7 dB at the frequency of interest. Amplifier “B" has gain 20 dB and noise figure 8.4 dB at the same frequency. Input and output impedances are 50 Q throughout. I. When used in cascade, what is the combined noise figure? From the answer obtained for question 1(b) i, what can you say about the combined noise figure when compared to the large noise figure given in second stage? I.
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