一种数字存储示波器显示电路的设计与应用

Design and application of special display circuit in a Digital Storage Oscilloscope

摘要:

为了满足高性能数字存储示波器波形显示的稳定性，介绍了以双口RAM IDT-70T3539M和EP1C4F324C8为主要器件搭建的数字存储示波器显示控制电路方案，详细讨论了 FPGA 内部各功能模块和液晶显示相关驱动程序的编写。与原显示方案相比，此方案更能满足示波器波形显示的各项性能指标要求。该显示方案实现了波形更新率为每秒2 000波形，支持分辨率为640×480和18 bit色的TFTLCD，并可实现多种显示方式。

Abstract:

In order to meet the stability requirement of the waveform display of high-performance digital storage oscilloscope, this paper describes a display control circuit scheme of the Digital Storage Oscilloscope(DSO) which is built by the dual-port RAM IDT-70T3539M and EP1C4F324C8 as the main components, and discusses in detail the all functional modules within the FPGA and the preparation of the LCD-related driver. Comparing with the former display plan，this plan can meet better the performance requirements of the waveform display of the oscilloscope. The plan can achieve the update rate of waveform for the 2 000 waveforms/s，supporting a resolution of 640×480 and 18 bit color TFTLCD，and can achieve a variety of display.