The electric or electronics engineers are addressing the difficult problems at the development of the equipment and the systems. Among them, the EMC problem of SMC is considered to be one of the most difficult problems. EMC consists of the electromagnetic susceptibility (EMS) or Immunity and EMI. All SMC consist of semiconductor devices and the transmission line. The transmission line consists of the insulator and the wire, which is called the interconnect in the case of LSI and is called the trace in the case of PCB. The semiconductor devices change the electromagnetic field on SMC. According to the electromagnetism, the changed electric field (EF) or the changing magnetic field (MF) forms the electromagnetic wave (EMW). The EMW which is generated by the semiconductor device travels in the insulator of the transmission line at light speed approximately. The reason is the following; the length of the interconnect which forms antennas is quite short, and the transistors in LSI are broken down easily by it when it is being handled. In addition, the timing control is the most important for the interconnect designs however it cannot be analyzed by the conventional EMW theory in the electromagnetism.
Many types of the instruments, CAD tools, and the simulators have been used for the circuit design and EMC design of SMC. The time domain types have been used for the circuit design of SMC usually. Symmetrically, the frequency domain types have been used for the EMC design of SMC usually. Because timing design of the signals is the main objective for the circuit design of SMC, and to minimize the electromagnetic interference with the broadcasting service is the main objective of the EMC design of SMC. As the result, the conflicts between the circuit designer and the EMC designer may develop sometimes.
This eBook is focused to improvement of both circuit design and EMC design of SMC. This eBook will present the solution or the guideline which is accepted willingly by the engineers of the circuit design and the EMC design of SMC because the presented novel theory and technologies are discussed based on the conventional EMW theory and SEMW theory. SMC is defined as the electronics circuit which works by the large amplitude motion of the semiconductor such as the transistor. Also the electric circuit which works by the switching motion of the electromechanical component such as the relay is SMC. SMC is being used in almost all electric and electronics equipment today. In contrast, the analog circuit is defined as the electric circuit which is being applied the small amplitude motion of the semiconductor such as the transistor or the dielectric and magnetic materials. The analog circuit is used in a limited field today.
I joined NEC in 1968 and was assigned to the circuit development department of the computer division. My first work was the circuit design of the switching mode power supply (SMPS) for the mainframe of the computer system. My job area was expanded to development of the design rule and to standardization of all over the electric and electronics parts for the non-logic circuit. Non-logic circuit was categorized to except the gate-array which forms the logic circuit of the mainframe. The experiment of SMPS was considered to be dangerousness and no one wanted to design. Therefore, my development of the power supply system (PSS) including the circuit design of SMPS was continued. The electric current of the mainframe and the supercomputer was reached to several thousand amperes. The critical problem of PSS was the heat dissipation and the electromagnetic interference (EMI) against the logic circuit. In 1992, the full-scale R&D of EMC became necessary hastily. I was nominated and transferred to the chief managing researcher of the established EMC engineering center in NEC Laboratories. I had believed that the switching mode circuit (SMC) including the digital circuit and SMPS circuit will be improved greatly if the EMC problem is solved. However the deep R&D was difficult because the actual fruits in every year were required strongly. Therefore, his knowledge of the science concerning EMC was not deepened enough. However I could understand the actual status of technologies of the electronics and electrics widely and the basic knowledge about how to approach the science as well as R&D could be learned. During this time, I completed PhD course and received the PhD. degree from Kyushu University, lectured in Kyushu University and Tohoku University for one year each, and executed several national projects by the cooperation of his colleague in NEC and of the supporters in the industrial society and academia. These are considered to be my best harvest in NEC Laboratories. I had decided to continue R&D for solving EMC problem of SMC after his retirement and to try the commercialization of the fruit of R&D. I established ICAST which is the abbreviation of the innovative circuit and system technologies in 2005. The solitary electromagnetic (SEMW) theory was advocated and the novel technologies including the low impedance lossy line (LILL) and the matched impedance lossy line (MILL) were invented based on the SEMW theory.
Two purposes exist in this eBook. The first is to be validated the SEMW theory by the academia and the industrial society. The second is the contribution to the growth of the industry in the world by the technologies of LILL and MILL.
List of Contributors
Dr Hirokazu Tohya