Multisim 10是美国国家仪器有限公司最新推出的EDA软件，它具有更加形象直观的人机交互界面，几乎能够100%地仿真出真实电路的结果。负反馈的多级放大电路是模拟电路中比较经典的电路，在此采用实验法，借助Multisim 10仿真平台，将具有负反馈的两级放大电路进行仿真，探索加入负反馈的电路特点。分析电路静态工作点和动态参数的变化以及加入负反馈后对电路放大倍数的影响，说明负反馈电路能稳定电路的静态工作点，放大倍数降低了，但频带得到了扩展，在实际设计电路时具有深远的现实意义。%Multisim 10 is a EDA software made by National Instruments. It has a more visually human-computer interaction interface and simulates the real circuit results in almost 100%. Negative feedback multistage amplifying circuit is a classic analog circuit. The two-stage amplifying circuit with negtive feedback was simulated with experimental method by means of Multisim 10 simulation platform to explore the features of the circuit adding negative feedback. Analysis The changes of circuit quiescent op-erating point and dynamic parameter,and the effect on circuit magnification after adding negative feedback are analyzed. It is pointed out that the negtive feedback circuit can stabilize the quiescent operating point of circuit. Though the magnification is re-duced,the frequency band is expanded. These conclusions have a profound significance in the actual design of the circuit.
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