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A 3-stage amplifier is to have an overall noise temperature no greater than 75°K. The overall gain of the amplifier is to be at least 40 dB. The amplifier is to be built by adding a low-noise first stage to an existing amplifier with existing characteristics as follows: Stage 2 has 20 dB power gain and 3 dB noise figure. Stage 3 has 15 dB power gain and 6 dB noise figure.

A 3-stage amplifier is to have an overall noise temperature no greater than 75°K. The overall gain of the amplifier is to be at least 40 dB. The amplifier is to be built by adding a low-noise first stage to an existing amplifier with existing characteristics as follows: Stage 2 has 20 dB power gain and 3 dB noise figure. Stage 3 has 15 dB power gain and 6 dB noise figure.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A 3-stage amplifier is to have an overall noise temperature no greater than 75°K. The overall gain of the amplifier is to be at least 40 dB. The amplifier is to be built by adding a low-noise first stage to an existing amplifier with existing characteristics as follows: Stage 2 has 20 dB power gain and 3 dB noise figure. Stage 3 has 15 dB power gain and 6 dB noise figure. a. What is the unitless gain of the first stage? b. What is the overall noise factor of the amplifier?
Transcribed Image Text:A 3-stage amplifier is to have an overall noise temperature no greater than 75°K. The overall gain of the amplifier is to be at least 40 dB. The amplifier is to be built by adding a low-noise first stage to an existing amplifier with existing characteristics as follows: Stage 2 has 20 dB power gain and 3 dB noise figure. Stage 3 has 15 dB power gain and 6 dB noise figure. a. What is the unitless gain of the first stage? b. What is the overall noise factor of the amplifier?
b. What is the overall noise factor of the amplifier? c. What is the unitless gain of stage 2? d. What is the noise factor of stage 3? e. What is the noise factor of stage 2? f. Calculate the maximum noise figure (in dB) that the first stage can have.
Transcribed Image Text:b. What is the overall noise factor of the amplifier? c. What is the unitless gain of stage 2? d. What is the noise factor of stage 3? e. What is the noise factor of stage 2? f. Calculate the maximum noise figure (in dB) that the first stage can have.
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