关键词: 电路芯片, 信号反射, 互连线, 输入阻抗, 特性阻抗, 阻抗匹配

Abstract: In order to reduce signal reflection of circuit chip when operating at a higher rate, frequency points in the range of 0-100 GHz are given arbitrarily, and then the LC impedance network is introduced, and applicable range is analyzed and LC network corresponding to each given frequency point is solved. Finally, LC network is connected to the terminal gate capacitance of conventional interconnect model so that input impedance of interconnect is equivalent to its characteristic impedance, thereby ensuring impedance continuity of the signal transmission path. Comparing the matching with the pre-matching, reflection coefficients of a certain frequency point and its certain bandwidth are effectively reduced, which verifies correctness of the LC network to reduce reflection of high frequency signals. The LC network-based matching method is also applicable to multiple multilayer chip structures with discontinuous impedance.

Key words: circuit chip, signal reflection, interconnect line, input impedance, characteristic impedance, impedance matching