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计算机系统实现工程化时,涉及一个系统阻抗的选择问题。所谓系统阻抗,指的是计算机内部信号传输通路上的阻抗值。一般来说,从驱动源发出的信号到达接收门,需经插件板印制线,底板印制线或双绞线、电缆线和插头座等,构成一个信号传输通路。在由高速集成电路构成的大型高速计算机系统中,由于脉冲频率极高,边沿很快,并且实行高密度组装。信号传输通路不能再视为是简单的短路,而是呈现传输线特性。负载及分布参数对电路工作的影响、信号互连线间的串扰、信号传输通路由于阻抗不连续造成的反射等都变得甚为严重。如
Computer systems to achieve engineering, involving a system impedance selection problem. The so-called system impedance, refers to the internal computer signal transmission path impedance. In general, the signal from the drive source to the receiving gate, through the printed circuit board, backplane printed wiring or twisted pair, cable and plug seat, constitute a signal transmission path. In a large high-speed computer system composed of a high-speed integrated circuit, since the pulse frequency is extremely high, the edge is fast and the high-density assembly is performed. Signal transmission path can no longer be regarded as a simple short circuit, but the transmission line characteristics. The influence of load and distribution parameters on the operation of the circuit, the crosstalk between the signal interconnection lines, the reflection of the signal transmission path due to the discontinuous impedance, etc., become very serious. Such as