Interference Control Technology - Excellent Textbook Electronic System Design: Interference Control Technology - Serial (I) 1 Introduction Every electrical engineer and technician hopes that the equipment he designs will cost less than expected, be ahead of schedule, work reliably, and will not interfere with other equipment. However, these goals are often not achieved due to the existence of electrical noise and electrical interference. If these problems cannot be solved within a limited time, we may have to abandon these projects or take patchwork measures, wasting all the time, money and efforts we invested in the project. For example, if digital systems exceed the Federal Communications Commission (FCC) limits on conducted and radiated emissions, we cannot sell these systems in the United States. Most European countries have similar requirements, and Germany\'s VDE0871 is the most stringent one. In the United States, military equipment must meet MIL-STD-461. Most electrical engineering courses and books either ignore electrical noise or limit the discussion to thermal noise. As a result, most engineers are involved in noise problems when debugging the first system they design. This usually has three side effects: (1) debugging takes much longer than expected, (2) the designer\'s confidence is dampened, and (3) the interference suppression devices needed to solve the problem increase manufacturing costs by 10 to 15%. Early in my career, I discovered a better approach: design interference suppression into the product from the beginning. This is a four-step process: (1) understand the types of interference problems, (2) design the circuit to minimize these problems, (3) design the circuit board and cable structure to eliminate these problems as much as possible, and use interference suppression devices when necessary. (4) Break the system into modules and debug it to confirm that each subsystem is assembled correctly, works properly, and has no problems before further assembly. By designing the system correctly from the beginning, I often complete the task ahead of schedule, at a lower cost, and feel good about myself. This book contains the results of my extensive (sometimes expensive) experience as a practicing electrical engineer for 14 years, discussions with collaborators, and three years of research on electrical interference control methods. Chapters 2 through 4 summarize the coupling paths by which interference is generated and received. Chapters 5 through 8 summarize techniques for reducing interference problems. Chapters 9 through 15 summarize physical design techniques for reducing interference. Chapter 16 summarizes techniques for discovering, confirming, and locating interference problems.
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