Section 6–4 / Root-Locus Plots of Positive Feedback Systems 307
whereGH is the open-loop transfer function. In Table 6–2, the root loci for negative-
feedback systems are drawn with heavy lines and curves, and those for positive-feedback
systems are drawn with dashed lines and curves.
jv
s
jv
s
jv
s
jv
s
jv
s
jv
s
jv
s
jv
s
jv
s
jv
s
Table 6–2 Root-Locus Plots of Negative-Feedback and Positive-
Feedback Systems
Heavy lines and curves correspond to negative-feedback systems; dashed lines and
curves correspond to positive-feedback systems.
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