Consider the followingstatements: 1-The effect offeedback is to reduce systemerror. 2-Feedback increases thesystem gain at one frequencybut reduces the system gain asanother frequency. 3-Feedbackcan cause an originally stablesystem to become unstable .Which of the above statementsare correct? *О 1,3О 2,3O 1, 2, 3O 1, 2 The transient response of asecond order system is given bythe following equation, for 5%criterion the settling time is *sin ,e4tC(t) = 1-sin wn1-72 + 6V1 -720.25 secO 4 secO 1.25 secO 0.75 sec

Feedback can either make a system stable if not stable previously or may be it can cause instability…

Consider the following statements: 1-The effect of feedback is to reduce system error. 2-Feedback increases the system gain at one frequency but reduces the system gain as another frequency. 3-Feedback

Consider the following statements: 1-The effect of feedback is to reduce system error. 2-Feedback increases the system gain at one frequency but reduces the system gain as another frequency. 3-Feedback

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...

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Question

Consider the following
statements: 1-The effect of
feedback is to reduce system
error. 2-Feedback increases the
system gain at one frequency
but reduces the system gain as
another frequency. 3-Feedback
can cause an originally stable
system to become unstable .
Which of the above statements
are correct? *
О 1,3
О 2,3
O 1, 2, 3
O 1, 2

The transient response of a
second order system is given by
the following equation, for 5%
criterion the settling time is *
sin ,
e4t
C(t) = 1-
sin wn
1-72 + 6
V1 -72
0.25 sec
O 4 sec
O 1.25 sec
O 0.75 sec

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(a) An amplifier system without feedback has the following specifications: Open loop gain: 90 Input impedance: 25k Output impedance: 5kQ (1) (ii) If the amplifier system employs negative feedback and the close loop gain is 9.5, calculate the system feedback factor, ß. Suppose the negative feedback topology used for the amplifier system in Q3(a)(i) is a current shunt feedback, determine the amplifier, input impedance and output impedance of the amplifier with feedback.
Q) An amplifier has an open-loop gain of 100 and a feedback ratio of 0.4. If the open-loop gain changes by 30% due to temperature, the percentage change in gain of the amplifier with feedback will be (a) 0.73% (b) 0.52% (c) 0.28% (d) 0.45%
3) The region where an amplifier is operating in a linear format is represented by: a) The positive feedback b) The common feedback c) The negative feedback 4) For oscillator operation the noise traveling around a loop, then being amplified as converging on a sine wave at: a) Two different frequencies b) Several frequencies c) Single frequency
(2) ukäi Q) In the negative feedback, which of the following * .statement is true (a) Gain, noise, distortion as well as the bandwidth of the amplifier are decreases. (b) The feedback is out of phase with their input signal and the the gain stability decreases. (c) It is called regenerative and used in amplifiers. (d) The input voltage is reduced and the input and output impedances are improved.
A system has a gain of 80 db without feedback, if the negative feedback is 1/50th. What is the closed loop gain of the system in db with the addition of the negative feedback?
A certain op-amp is used in a feedback configuration having a gain of 20 and a bandwidth of 500 kHz. a)If the external resistor values are changed to increase the gain to 40, what is the new bandwidth? The new bandwidth is 250khz What is the unity-gain bandwidth of the op-amp ??
Q6: Choose the correct answer among the following: 1- For the ramp input, the steady state error of the control system (Type one) is: a) zero b) A/K c) infinite d) none of the them 2- After moving the pick-off point (as shown in the figure). The feedback transfer function will be equal to: R)- a) H₂G, /a)1 b) H₂/G₁ a) 1
3-Discuss the effect of negative feedback on the frequency response
If the voltage gain of an amplifier without feedback is 20 and with negative feedback it is 12, then feedback fraction is ?
The voltage gain of an amplifier without feedback is 3000. What will be the voltage gain of the amplifier with negative feedback if the feedback factor is 0.01?
6. What is the output voltage from a 4-bit R-2R DAC, if the feedback resistor is 10 ka network R = 5 ko? Assume a reference voltage of 4.8V, and a binary input of 1011.