应用于晶体管图示仪的CPLD控制器设计

Design of CPLD Controller for Transistor Curve Grapher

传统的晶体管图示仪体积庞大、显示屏小、图形无法保存。基于CPLD的特性,设计以CPLD控制器为核心的数据采集电路。将其与传统的晶体管图示仪相结合并通过单片机和串行通信在微机上显示晶体管特性曲线。所设计的CPLD控制器满足了单片机、存储器和A/D转换器之间的时序配合要求,改善了原有图示仪的不足,实现并扩展了仪器的功能。

The traditional transistor curve grapher has weakness of big volume and small screen, and it is unable to save graph. Based on the property of CPLD,a data- acquisition circuit is designed by using CLPD controller as the core. Combining with old transistor curve grapher, using single chip computer and serial port communication, the transistor characteristic curves is displayed on the microcomputer. This CPI.D controller has met the needs of timing matching among single chip computer, RAM and A/D converter, overcame the weakness of the former Grapher, realized and expended performances of the instrument.