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Problem 6.42PP
For the system
100(j/a+ l)
G(i) = -
'5 ( j+ l ) ( j / f r + l ) *
where b = 10a, find the approximate value of a that will yield the best PM by sketching only 
candidate values of the frequency-response magnitude.
Step-by-step solution
step 1 of 1
G(s)=-
^ e re b=10a.
Step 1 of 1
is alead compensatorwith a=0.1
Gain o f - 2 0 l o g - l O d B occurss at cd̂ =17.8
Va
cV = - 5 j==17.8
7>l2
T=0.1776
=-^=5.63 
T_____