基于晶体管GP模型的Multisim仿真建模方法

发布时间：2019-03-31 11:49

【摘要】：在现代电子电路设计中,先对电路进行前期软件仿真已经是必不可少的环节,然而仿真结果的可信度和真实度又取决于建立的仿真模型正确与否.Multisim仿真软件提供了部分型号三极管的仿真模型,但不够全面.对于特定三极管,需要在仿真软件中建立相应的仿真模型,以得到较理想的仿真结果.利用三极管的数据手册,介绍在Mulitism仿真软件中建立三极管GP模型的方法,并对2N3903型三极管的仿真模型与实物分别进行了直流扫描和交流特性对比分析.从直流扫描分析结果中可以看出:在饱和区,仿真曲线与实测曲线基本上一致;在放大区,仿真曲线与实测之间有一定的差异,但是平均相对误差小于10%.主要原因是晶体管存在分散性,而数据手册提供的是平均特性.从波特图仿真与实测结果中可以看出仿真的3dB通频带要比实际3dB通频带宽,主要原因是仿真模型中只考虑了三极管的极间电容影响,没有考虑三极管衬底电容的影响.实验结果表明利用该方法建立的仿真模型与实测数据基本上一致.
[Abstract]:In the design of modern electronic circuit, it is necessary to do the preliminary software simulation of the circuit first. However, the reliability and authenticity of the simulation results depend on whether the established simulation model is correct or not. The Multisim simulation software provides some simulation models of Triode, but it is not comprehensive enough. For the specific transistor, it is necessary to establish the corresponding simulation model in the simulation software, in order to obtain the ideal simulation results. Using the data manual of transistor, the method of establishing GP model of transistor in Mulitism simulation software is introduced. The DC scanning and AC characteristics of 2N3903 Triode are compared and analyzed. It can be seen from the DC scanning analysis results that in the saturation region, the simulation curve is basically consistent with the measured curve, and in the magnified region, there is a certain difference between the simulation curve and the actual measurement, but the average relative error is less than 10%. The main reason is the dispersion of the transistor, while the data manual provides average characteristics. It can be seen from the simulation and measurement results of the baud chart that the simulated 3dB band is larger than the actual 3dB band. The main reason is that only the influence of the interpolar capacitance of the transistor is considered in the simulation model, but the influence of the substrate capacitance of the transistor is not taken into account. The experimental results show that the simulation model established by this method is basically consistent with the measured data.
【作者单位】：西南大学工程技术学院;
【基金】：西南大学博士基金项目(SWU116044);西南大学教学改革研究项目(2016JY012)
【分类号】：TN32

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