2005828132558922 Automation and Instrumentation ZID ONG HUA YU Y IQI Y IBIAO 2003 No. 2 (Total No. 106) Article Number Factors Affecting Characteristic Impedance of Printed Circuit Board and Countermeasures 3 Tian Li Department of Electrical Engineering, Anhui University of Technology, Wuhu Abstract This paper gives the definition of characteristic impedance of printed circuit board, analyzes the factors affecting characteristic impedance and its structure, and finally gives some countermeasures. The influence of parameters on the accuracy of characteristic impedance Keywords Characteristic impedance accuracy of printed circuit board × °. × °. °. ¤ ° Chinese Library Classification Number Document Identification Code ± E @ × Introduction my country is in a period of economic construction and reform and opening up. The annual growth rate of the electronics industry will exceed that of printed circuit boards, and the growth rate of the entire electronics industry will also rise with the trend. The technological revolution and industrial structure changes in the world\'s electronics industry are bringing new opportunities and challenges to the development of printed circuits. With the miniaturization, digitization and high frequency of electronic equipment, printed circuits are used as electrical interconnects in electronic equipment. With the development of multifunctionality, it is not only a question of whether the current flows or not. The metal wire in the circuit is used as a signal transmission line. That is to say, for high-frequency signals, it is necessary to measure not only the electrical test for the transmission of high-speed digital signals, but also the measurement of the continuity and short circuit of the circuit or network. Whether it meets the requirements should also be measured. Whether the characteristic impedance value is within the specified qualified range should also be measured. Only the printed circuit board meets the requirements. If both directions are qualified...
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