Several Models of the Multi-loop Negative Feedback Circui t and Their Analysis

The actual negative feedback amplifying circuit doesn't form a c losed-loop only from the basic amplifying circuit and the feedback network ,but forms the multi-loop system (multi-loop negative feedback circuit )from sever al basic amplifying circuits a nd several feedback networks.Here this article describes and analyses the genera l charts of several multi-loop negative feedback amplifying circuits and the ge neral formula of the “closed-loop” amplifying (transfer function).