Linear feedback in nonlinear circuits

Nonlinear models can be used to describe a wide class of circuits. In this paper, a feedback that only includes linear components is introduced into a nonlinear circuit to improve the performance. It is shown that the generalized frequency response function of the closed loop system can be analytically and explicitly expressed as a polynomial of the linear feedback matrix. The coefficients of the polynomial are independent of the linear feedback matrix, which can greatly facilitate the analysis and design of the closed loop nonlinear circuits.