摘要
光电耦合器具有很强的抗干扰能力，在微机控制的数据采集系统中，光电耦合器所处的位置对系统的性能有直接的影响。本文阐述了光电耦合器位于A／D转换器之后和之前两种方案的特点、存在的问题及解决问题的办法；最后指出，为了适应A／D转换器和CPU等功能模块集成在一块芯片上这一微处理机的现状和发展趋势，应该认真研究和更多地采用将光电耦合器放在A／D转换器之前这种方案。
Light-electric coupler has great ability to resist interferences. In data sampling system controlled by microcomputer,it can be situated before or behind the A/D transmission,but its situation has direct ofference to the system. In this report, we describe the characteristics of the two designs,the problems in them and the ways to solve them. At last, we point out, to suit the present situation and development trend that A/D transmission and CPU etc. function block are intergrated in a chip as a microprocessor,we should make serious research and adopt the design of situating the light-electric coupler before A/D transmission.
出处
《微处理机》
1995年第1期35-39,共5页
Microprocessors
