【摘要】 文章利用MATLAB软件编程,对设计的由运算放大器构建的电流串联负反馈放大电路采用方框图分析法进行理论计算.结果表明:闭环增益与开环增益满足基本关系式;引入负反馈后稳定性得以提高,输出电阻增大;同时使用EWB对开环与闭环增益也进行了仿真分析,结果与理论计算一致,从而定量地验证了负反馈放大电路中的结论与关系.更多还原

【Abstract】 By adopting MATLAB software, the paper applies the block diagram for theoretical calculations of the series negative current feedback amplifier circuit which is designed by operational amplifier。 The results indicate: 1) closed- loop gain and open- loop gain to meet basic relationship; 2) the stability of feedback is enhanced and output resistance increased。 Furthermore, the result of open- loop and closed- loop gain of theoretical calculation is consistent with simulation which is applied by EWB software, which confirmed elementary conclusions and relationships in negative- feedback amplifier quantitatively.更多还原