Study And Design Of Portable Digital Storage Oscilloscope

With the development of science and technology, the oscilloscopes, as common instruments, have made great progress. With digital technology, the oscilloscopes have become a kind of intelligent instrument with functions: waveform display, parameter measure, detecting, analyze, storage, and so on. The Digital Storage Oscilloscope (DSO) will replace Analog Oscilloscope. At present, domestic DSO product's type, which has our own independent property right, is too few. The DSO is hindered to apply wildly in our production and test by high price. On the basis of the analysis of DSO's fundamental principle, the design and implementation of a kind of portable digital storage oscilloscope system was discussed in detailed in the dissertation.The system discussed in the dissertation has the architecture built with CPU and CPLD (complex programmable logic device), and use liquid crystal display (LCD). The structure's most important feature is flexible structure and general usage. It enables designer to develop product within shorter time, and the system can be expanded easily. The Single-chip microcomputer W77E58 of Winbond Inc. controls the whole system, and at the same time it functions data processing. The EPM7064S of Altera Inc. works as the system's peripheral controller include FIFO (first in first out) memory and sampling clock controller. By using LCD, it provides the friendly interface for user's convenient operation, and makes the system miniaturization and portable.The theory and characteristic of DSO are amply introduced, then the hardware-software design frame and thought are given. Signal condition circuit, A/D circuit, time-base circuit and trigger circuit are discussed. Flow chart of system main software is given, how to use waveform interpolation theory to heighten USB (Usable Store Bandwidth) and how to rebuild the waveform are studied.Some signality practical problems about the real time embedded system are resolved while developing the portable DSO. The paper's design object is basically achieved.