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Behaviour of Electromagnetic Waves in Different Media and Structures Part 10

Tham khảo tài liệu 'behaviour of electromagnetic waves in different media and structures part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 258 Behaviour of Electromagnetic Waves in Different Media and Structures is clarified that both low impedance of the voltage source and the short length of the PL are necessary to keep the signal integrity of the SMC. The SEMW theory first clarified the existence of three kinds of the current on the SMC. The current observed on the transmission line is the first current to follow the Ampère s law. This current has the same wave shape as the SEMW. When the electrostatic energy is taken out from the power source the current which follows the Ampère s law flows and it is the second current. The magnitude of this current is decided by the source voltage and the characteristic impedance of the transmission line. The electron current for the matched termination resistance flows whenever the SL is being charged. This is the third current. Te reflection or the bounce on the transmission line of the SMC has been analyzed by using the method of the lattice diagram currently which has the other names such as the bounce diagram the echo diagram or the reflection diagram. This method has been used widely for the design and analysis of the SMC 18 . However this method cannot handle the electromagnetic phenomenon. The SEMW theory enables the analysis of the reflection or the bounce from the point of view of the electromagnetism easily. 3.4 Simulation of the influence of the length of the PL Fig. 8 shows the equivalent circuit for simulation by HSPICE. Driver VDD 51Q Fig. 8. Equivalent circuit for simulation Power line In Fig. 8 VDD is the ideal DC voltage source and the out-put voltage is 2.5V. The driver was described by the sub-circuit depending on the design parameter. The calculated characteristic impedance of the PL and the SL were 51.28A which was got from ApsimRLGC . The simulation result will be reliable in spite of the HSPICE because the lossless transmission line is used. Fig. 9 shows the simulated voltage of the point B and C at the varied length of the PL. Fig. 9. .