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# ex9_23 - text(15,0'Exact text(3-25'Asymptote w =.1 1 10 100...

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% Example 9.23 % % obtain actual Bode plot num = 63*[1 1]; den = [1 6 100 0]; we = logspace(-1,3,300); [mage,phasee] = bode(num,den,we); mage = 20*log10(mage); % % obtain the asymptotic plot % calculate w = [.1 2 10 50 1000] for the magnitude plot % constant term w = [.1 1 10 1000]; term1 = 20*log10(.63)*ones(1,length(w)); term2 = 20*log10(w); term2(1) = 0; term3 = -20*log10(w); term4 = -40*log10(w/10); term4(1:2) = [0 0]; mag = term1+term2+term3+term4; clf subplot(211),semilogx(we,mage,w,mag,'--') grid ylabel('|H| dB') xlabel('Frequency (rad/sec)') title('Example 9.23') axis([.1 1000 -80 20]);
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Unformatted text preview: text(15,0,'Exact') text(3,-25,'Asymptote') % w = [.1 1 10 100 1000]; term3 = [-90 -90 -90 -90 -90]; term2 = [0 45 90 90 90]; term4 = [0 0 -90 -180 -180]; phase = term2+term3+term4; subplot(212),semilogx(w,phase,'--',w,term2,'-.',w,term3,'-.',w,term4,'-.',we,phasee ) axis([.1 1000 -200 100]); grid ylabel('Angle(H), degrees') xlabel('Frequency (rad/sec)') ytick = [-180 -90 0 90]; set(gca,'ytick',ytick) text(10,70,'1') text(100,-70,'2') text(.3,-20,'3') text(7,-20,'Exact') text(40,-120,'Asymptote') subplot(111)...
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