%
% SEM 5928 - Sistemas de Controle 
% Escola de Engenharia de São Carlos - USP
%
% Adriano Siqueira - 2016
%

%w = .1:.1:100;
w = logspace(-1,2,1000);

for i=1:length(w),
re = (3*(3-w(i)^2))/((3-w(i)^2)^2 +w(i)^2);



im = -3*w(i)/((3-w(i)^2)^2 +w(i)^2);



Gw = re +j*im;

MGw(i) = abs(Gw);

MGwdecibel(i) = 20*log10(MGw(i));

FGw = angle(Gw);

FGwgraus(i) = FGw*180/pi;

end

figure;plot(w,MGw)
figure;plot(w,MGwdecibel)
figure;semilogx(w,20*log10(MGw))