A Block Diagram Analysis of Negative Feedback Amplifier Circuit Based on EWB Software

The paper applies the block diagram for simulation analysis and theoretical calculations of parallel negative voltage feedback amplifier circuit which is constructed by operational amplifier.The result of simulation indicates: 1) closed-loop gain and open-loop gain to meet basic relationship;2) the stability of feedback is consistent with the theory and input and output resistance decreases;3) the feedback coefficient is approximately equal to the reciprocal of the closed-loop gain in the deep negative feedback conditions.Furthermore,the result of open-loop and closed-loop gain of simulation is consistent with theoretical calculation.In short,the paper illustrates the feasibility of block diagram simulation analysis in negative feedback amplifier circuit.