双路及时锁存分时进入的快接口电路

TWO-CHANNEL FAST INTERFACE CIRCUIT WITH TIME LATCH AND TIME-SHARING ENTERING

在核物理实验中,常常需要对多路脉冲信号进行幅度分析及数据获取.通常使用多路模拟混合方式予以实现,也有采用DMA链的方式.本文介绍的接口电路不用模拟混合器,而采用对两路ADC变换的二进制码分别进行及时锁存、DMA分时进入的方式来实现两路数据获取,线路的组成比较简单而传送速率较快.本接口电路主要分为四个部份:顺序控制电路产生顺序控制信号,以保证两路数据代码按“先来先送,后来后送”的原则进入地址总线;地址形成电路将ADC变换的数据代码及予置的高位地址代码,变成对应两路数据存贮区的RAM+1所需的地址码;

In this paper, a fast interface circuit connecting two-ADC with a Apple-II microcomputer is described. Detailed operating principle and composilion of the circuit, and logical sequence are given. The interface circuit is used [or Na)](TL) anti-conpton spectroscopy in measuring capturing cross section of neutron and capturing r- spcctrum. It is shown that transmisson ratio of the circuit is rather fast.