Practical Design Of Portable DSO Based On SOPC Technology

With the development of the electronic measuring technology, measuring technology is geared to automatization, intelligentization,networking. Digital storage oscilloscope (DSO) is gradually replacing the tradtional analog oscilloscope, because it has predominant function. But the volume of desktop oscilloscope is too big to take and use in field. Portable DSO supplies the gap.This research of DSO is based on the SOPC(System On Programmable Chip) technology, which consists of sampling system,CPU system,display system, user interface, etc. The paper selects the EP2C20 chip of the Altera Company, which embeds Nios who is high soft core processor.The main task of this paper:The design and manufacture of the Circuit board which is the basis of the design. The design adopts core board and expand board. The core board is 6 layer and expand board is 2 layer. So it is more stable and reduces cost. The design of data acquiring system. It is the hardcore of the design of digital storage oscilloscope. This adopts high speed A/D chip(ADS9288)whose sampling rate could reach 100MMPS. So its real band could reach 20MHz. SD storage circuit. SD has huge storage, convenience of taking, low cost etc. So it is used as main digital storage chip. its Drive part is convenient because it adopt SD soft package. LCD control . As display system of user interface, this design adopt 320*240 LCD. 250*200 LCD is used as wave display . The else is used as menu display.