Topological criterion for the stability of DC operating points in transistor circuits

摘要

This paper treats instability of dc operating points in transistor circuits. The stability of dc operating points is defined after the fashion of Green-Willson's one. We give n assumption about parasitic reactances added in a dc circuit linearized around a given operating point. Based on this assumption, a sufficient condition for unstable operating points is derived. We also consider a topological interpretation of the derived sufficient condition.