UPDATE:
My system is a frequency locked loop, by the diagram bellow, I intend to make a plot of a frequency Vs error signal as shown below.
Given this plot how would it help me to know the controller parameters i should use when building the controller?
Thanks.
/g/electronics101/photo/296358/3868979?p=Created%2C%2C%2C20%2C2%2C0%2C0
/g/electronics101/photo/296358/3868978?p=Created%2C%2C%2C20%2C2%2C0%2C0