Novel comprehensive feedback theory—Part I: Generalization of the cut‐insertion theorem and demonstration of feedback universality

The previous cut-insertion theorem, defined for linear circuits and particular three-terminal (TTCs) to be inserted into the cut, is here extended any TTC and, in a simplified form, non-linear networks. may include dependent independent sources other passive and/or elements, together with remaining part of circuit, determines feedback loop which “transmission factors” T $$ ′ {T}^{\prime } can computed. theorem allows obtain all circuit properties: overall gain, driving-point immittances, new properly “cut immittance,” sensitivity, so on. For = 0 , }=0,T becomes “classic” gain. As will shown Part II paper, approach, depending on implementation, includes unifies models enables creation ones. Moreover, starting from paradigmatic definition system as output quantity an effect itself, universal presence shown. Finally, results are highlighted by application unilateral systems, such digital latches, bilateral circuits, bridged-