The theory computation and simulation analysis of differential common-collector Negative feedback amplifier circuit

A direct-coupled mode differential common collector voltage negative feedback amplifier is built,EWB is used to simulate the circuit under condition that the input variable is DC differential form.The result indicates that the open and loop transresistance gain according to the definition meet the basic relation.The quiescent current is calculated with reasonable approximation.The theoretical open transresistance gain is calculated according to the gain and convert relations between the gains in multi-stage amplifier.The transresistance gain of feedback amplifier is derived with the method of micro-change equivalent circuit.They both meet the basic relation of feedback.The simulation and the theoretical result are very approximate.The maximal error does not exceed 1.02% which indicates their consistency.