20 A feedback amplifier with a compensation cacacitor has a low-frequency loop gain of 100dB and three poles at fr1= 10Hz and fp2 = 5MHz, and fr3 = 10MHz. a) Find the frequency at which T = 1 b) If the frequency fr1 is due to a compensation capacitor CF=20pF, determine the dominant the new dominant pole fer and phase margin if the compensation capacitor is increased to CF = 75pF.

20 A feedback amplifier with a compensation cacacitor has a low-frequency loop gain of 100dB and three poles at fr1= 10Hz and fp2 = 5MHz, and fr3 = 10MHz. a) Find the frequency at which T = 1 b) If the frequency fr1 is due to a compensation capacitor CF=20pF, determine the dominant the new dominant pole fer and phase margin if the compensation capacitor is increased to CF = 75pF.

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...

See similar textbooks

Similar questions

Design a feedback amplifier corresponding to the block diagram shown below. The amplifier (A) must be a multistage-cascaded common source with a minimum number of stages. Draw the circuit and then analyze the feedback amplifier to find A, B, AVf, and Rif Is A o Vo If
A negative feedback closed loop system gain, y(t) /r(t) ), of at least 7.5 is needed with a ß = 0.1. a. What is the minimum value of the forward gain, 4, that will allow this? b. What is the loop gain for this system?
Consider the following statement: In feedback amplifiers, concerning the connections between the direct amplifiers and the feedbacks network, a shunt connectiın at the input part servers to set an increased versiın of the input impedance of the direct amplifier, whereas again a shunt connection at the output part services to set a decreased version of the output imdepance of direct amplifier. Explain what is wrong with the statement above by drawing representative circuit diagrams and outlining the necessary calculations.
1. A unity feedback system is characterized by an open loop transfer function The system will have a damping factor of 0.55. For this value determine the natural frequency of the system. It is subjected to a unity step input. Also obtain all the time specifications.
6
Q) In the negative feedback the low frequency and the high frequency * :with the feedback are (a) flf= fl /(1+AB) and fhf= fh /(1+Aß), where flf = low frequency with feedback (b) fhf= fh /(1+AB) and flf= fl (1+AB), where fhf = high frequency with feedback (c) flf= fl (1+AB) and fhf= fh (1+AB) (d) fhf= fh (1+AB) and flf= fl /(1+AB) O
Figure 6 shows a circuit where feedback is provided between the drain and gate of the transistor M1 Q6 Draw the small signal equivalent circuit of the open loop circuit obtained by breaking the loop at the gate of transistor M1 (suitable for the analysis in the mid band frequency range). Consider Cg as short circuit in the model and state any assumption. (a) (b) State the necessary conditions for the oscillation to occur in the circuit. Using the conditions from (b), derive an expression for the amplifier oscillation frequency fo. (c) Derive the necessary condition for the oscillation to occur in the circuit and state if you can conclude that the circuit will oscillate when considering the values of the inductances L2 = 8 LI = 2 mH; capacitors C = 2 nF; transconductance of the transistor gml = 1.4 mS; and resistors R1 = R2 = Rs : 10 k2. (d) %3D L2 L, R, Cg. C Vout Cp M1 R2 CG Rs Cs Vss = 0 V Figure 6
control system, the A feedback Conerollar and procers thansfon fanction St40 GCS) = De termine a Stab le the gain K for gotem.
the fystlen A A unity feedback Susten has a forrard traf trandsfer functin of 10Es+20)(5t 30) 52(5+25)(5+35)CH50) is as state the fystem ype. step, Cu) fuid the stahi emr Coustants for Stepe, raup and farabolic inputs.