A three stage amplifier is to have an overall noise temperature no greater than 70 K. The overall gain of the amplifier is to be at least 45 dB. The amplifier is to be built by adding a low-noise first stage to an existing two-stage amplifier that has the gains and noise figures shown below. The stage number refer to locations in the new amplifier. Stage Power Gain Noise Figure 2 20 dB 3 dB 3 15 dB 6 dB a. What is the minimum gain in decibels that the first stage can have? b. Using the gain you calculated in part (a), calculate the maximum noise figure in decibels that the first stage can have. Express answer with two decimal places. c. Suppose the gain of the first stage could be increased by 3 dB without affecting its noise figure. What would be the effect on the noise temperature of the complete amplifier?

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
icon
Related questions
Question

I already posted this here but I'm disappointed with the bad handwriting of the one who answered it. It's so untidy and I don't understand anything.

Please help me answer these completely and neatly. Thank you!

A three stage amplifier is to have an overall noise temperature no greater than 7O K.
The overall gain of the amplifier is to be at least 45 dB. The amplifier is to be built by
adding a low-noise first stage to an existing two-stage amplifier that has the gains
and noise figures shown below. The stage number refer to locations in the new
amplifier.
Stage Power Gain Noise Figure
20 dB
3 dB
13
15 dB
6 dB
a. What is the minimum gain in decibels that the first stage can have?
b. Using the gain you calculated in part (a), calculate the maximum noise figure in
decibels that the first stage can have. Express answer with two decimal places.
c. Suppose the gain of the first stage could be increased by 3 dB without affecting its
noise figure. What would be the effect on the noise temperature of the complete
amplifier?
Transcribed Image Text:A three stage amplifier is to have an overall noise temperature no greater than 7O K. The overall gain of the amplifier is to be at least 45 dB. The amplifier is to be built by adding a low-noise first stage to an existing two-stage amplifier that has the gains and noise figures shown below. The stage number refer to locations in the new amplifier. Stage Power Gain Noise Figure 20 dB 3 dB 13 15 dB 6 dB a. What is the minimum gain in decibels that the first stage can have? b. Using the gain you calculated in part (a), calculate the maximum noise figure in decibels that the first stage can have. Express answer with two decimal places. c. Suppose the gain of the first stage could be increased by 3 dB without affecting its noise figure. What would be the effect on the noise temperature of the complete amplifier?
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 8 steps

Blurred answer
Knowledge Booster
Analog to digital converters
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,