A three-stage amplifier is to havean overall noise temperature nogreater than 70 K. The overal gainof the amplifier is to be at least 45dB. The amplifier is to be built byadding a low-noise first stage to anexisting two-stage amplifier thathas the gains and noise figuresshown below. (The stage numbersrefer to locations in the newamplifier)StagePowerNoseFigureGain220 d83 dB315 d86 đBSuppose the gain of the frst stage couldbe increased by 3 d8 without affectingts noise figure What would be theoffect on the noise tomperature of thecomplete amplifier?a reduced by 15 Kbincreased by 15 Kcincreased by 30 Kd reduced by 30 K

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Answered: A three-stage amplifier is to have

Engineering

Electrical Engineering

A three-stage amplifier is to have

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Operational Amplifier

An operational amplifier also called op amp is an integrated circuit or analog circuit that takes input as a differential voltage and produces output as a single-ended voltage. It is an IC that can amplify weak electric signals.An op amp has one output pin and two input pins. The basic role of an opamp is to amplify the voltage difference between the two input voltages. It is also used in filtering or to perform mathematical operations or in signal conditioning.

Question

A three-stage amplifier is to have
an overall noise temperature no
greater than 70 K. The overal 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 numbers
refer to locations in the new
amplifier)
Stage
Power
Nose
Figure
Gain
2
20 d8
3 dB
3
15 d8
6 đB
Suppose the gain of the frst stage could
be increased by 3 d8 without affecting
ts noise figure What would be the
offect on the noise tomperature of the
complete amplifier?
a reduced by 15 K
bincreased by 15 K
cincreased by 30 K
d reduced by 30 K

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