initial commit / add all books

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+// Exa 5.27

+clc;

+clear;

+close;

+format('v',9)

+// Magnitude of loop gain, Mag_Tf= bita*100/(sqrt(1+(f/10^5)^2))^3         (i)

+// Phase of loop gain, P_Tf= -3*atand(f/10^5)                                               (ii)

+f_180= tand(180/3)*10^5;// from eq(ii), frequency at which phase becomes -180°

+bita= 0.20;

+T_f_180= bita*100/(sqrt(1+(f_180/10^5)^2))^3;// from eq (i), the magnitude of loop gain at f_180 for bita= 0.20

+disp(T_f_180,"The magnitude of loop gain for beta = 0.20 is : ")

+bita= 0.02;

+T_f_180= bita*100/(sqrt(1+(f_180/10^5)^2))^3;// from eq (i), the magnitude of loop gain at f_180 for bita= 0.20

+disp(T_f_180,"The magnitude of loop gain for beta = 0.20 is : ")

+disp("Hence system is unstable for beta=0.20 and stable for beta= 0.02 because at beta= 0.20 gain is greater than 1.")

+