%
% Example 9.6
%
% Note that in this example, in the book (page 416), the function log
% has been used instead of the function log10, so that the obtained values  
% in the text have to be recalculated. 
%
%
w=20;
while 20*log10(100*abs(j*w+10)/abs(((j*w)^2+2*j*w+2)*(j*w+20)))<-11;
w=w-1
end