适用于嵌入式应用的高速信号采集电路

介绍了高速采集电路的一个现场数据采集系统的前端．该采集电路由高速A／D,CPLD及高速存储器构成,类似数字示波器或采样卡,具有高速采样,高速缓存以及完整的触发设置功能,适合采集高速瞬时信号．但与通用信号采集产品不同的是该产品具有开放的总线接口．可直接连接各种单片微机,DPS或微处理器,适用于嵌入式系统的应用场合．描述了该电路的功能和原理,重点讨论“Roll Mode”逻辑及其如何实现对高速瞬时信号的捕获功能．

A High-Speed Signal Acquisition Circuit Being Used in Built-in System

The acquisition circuit presented in this paper is a front-end of a field data collection system.This circuit consists of a high-speed A/D,A CPLD and a high-speed memory.Like the digital storage oscilloscope or other PC-based acquisition cards,it has functions of high-speed sampling,high-speed buffering and complex configurable triggering,suitable for acquiring high-speed,transient signal.Unlike the digital storage oscilloscope or other universal acquisition products,it has an open interface adapting CPU bus,which can be linked to a single-chip microprocessor,micro-controller or DSP directly.Thus,this circuit is suitable for embedded applications.This paper describes the function and principle of the circuit,focuses on "Roll Mode" logic and how this logic performs the acquisition of high-speed transient signal.