ex5_18.m

反馈控制系统设计与分析（matlab程序）

G=tf(1,[conv([1,1],[1,2]),0]);
[x0,y0,w]=bode(G); [x,y]=bd_asymp(G,w);
subplot(211), semilogx(w,20*log10(x0(:)),x, y)
subplot(212), semilogx(w,y0(:))

G=G*tf([1,3],1);
[x0,y0,w]=bode(G); [x,y]=bd_asymp(G,w);
subplot(211), semilogx(w,20*log10(x0(:)),x, y)
subplot(212), semilogx(w,y0(:))