Say there is a system with open-loop transfer function G(s)=1/(s−1) . The system is definitely unstable.

If I put any nonlinear system in cascade with G(s) and from the output, a negative unity feedback. Is it possible to make the system close-loop transfer function is stable? It is assumed that the higher order harmonics are filtered in the close loop path. electrical-engineering

  • $\begingroup$ There is no closed-loop transfer function, because due the non-linear element the total system cannot be described by a transfer function any longer. $\endgroup$ – Matt L. Mar 14 '15 at 12:01
  • $\begingroup$ Cross-post from electronics.SE. $\endgroup$ – Matt L. Mar 14 '15 at 12:06
  • $\begingroup$ You can do that with a linear element (a single gain will work), why use nonlinear element? $\endgroup$ – obareey Apr 6 '15 at 18:12

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