| As the fast development of electronic equipment towards high speed, high sensitivity, high density and miniaturization, lines of power and communication become more and more intensive, printed circuit boards are getting smaller and smaller and frequency of clock signal becomes higher and higher. The phenomena of delay, distortion, crosstalk and scattering become more and more serious. These phenomena are closely related to electromagnetic interference, more attention has been paid on the electromagnetic compatibility of electrical and electronic equipment. As it is directly related to health and safety of patients, the research and test of electromagnetic compatibility of modern medical devices is very necessary. Test of electromagnetic compatibility of these devices can prevent the direct or indirect damage to bodies resulting from electromagnetic interference, and it also plays an important role in safety of medical devices. Correct analysis of the phenomenon such as crosstalk helps to solve the problem found in test and is important for the production of the equipment.The main work of this paper is that the crosstalk is analyzed through the theory of multi-conductor transmission line and FDTD and the electromagnetic compatibility of modern medical devices has been tested and analyzed. This paper firstly introduces the theory of the calculation of crosstalk among lines, including basic principle of Finite Difference Time Domain Method, grid partition, numerical stability and absorbing boundary conditions, telegraph equation of transmission lines and the calculation of unit length parameter matrices. Then the iteration formula is derived by applying FDTD for multi-conductor transmission line in discrete times and spaces, and the model is build. The transient response of different conductors is simulated by MATLAB. At last, the specific environment condition, test equipment and test process of electromagnetic compatibility test is introduced the problems in these tests is analyzed. |
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