Theoretical Calculation and Simulation Analysis for Negative Feedback of Series Circuit with Differential-Operational Amplifier

Differential-operational amplifier current with series negative feedback of circuit is designed,transconductance gain is achieved by calculating the basic amplifier voltage gain according to the calculating method for multistage amplifier.Moreover,transconductance gain of feedback amplifier is also derived by solving the node equations of small-signal equivalent circuit,the results show that the basic relationship of negative feedback amplifier circuit is satisfied in the two methods.Furthermore,the result of the basic amplifier transconductance gain and the feedback amplifier gain of theoretical calculation and simulation is consistent with EWB software.