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root locus technique tells about the location of the poles in the complex plane -->through that it explains the stability of the systems
it also tells that how much you can change b/w different perameters of a system like gain resonent frequency to acheive required performance with acceptable stability
If you want to investigate feedback theory more basically and mathematically, it's better to refer (linear) control systems books such as Cho, Dorf, etc;
but if it's enough to have another glance at feedback systems from r-locus point of view in microelectronic circuits you must see Gray's book (4th ed., Chap. 9).
to analyze feedback systems simulating you may use MATLAB.
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