Digital Storage Oscilloscope Based On DSP, FPGA And LCD

With the development of the electronic measuring technology, measuring technology is geared to automated, intelligentization and network directions. Digital storage oscilloscope as the important measuring apparatus is widely used in various fields. Compared with analog oscilloscope, Digital storage oscilloscopes allow you to capture and view events that may happen only once - known as transients. A DSO is ideal for low-repetition-rate or single-shot, high-speed, multi-channel design applications. DSO is gradually replacing the traditional analog oscilloscope. The technology of DSO advances abroad and occupies a large part of market share in China. In our country, the development of DSO is just in its initial stage and very successful product has not been developed.Based on the technology of DSP and FPGA, the DSO uses large-screen LCD as the display terminal and consists of sampling system, CPU system, display system, user interface, etc. DSO covers the theories of signal pretreatment, data collection, frequency detection, automatic control, analysis of frequency spectrum and data processing. It has two working modes of real-time sampling and roll sampling. The two sampling modes can be switched automatically by the timebase turn-button. When observing low frequency signal, we use roll sampling solving the problem with only one spot rolling on the screen of analog oscilloscope. In addition, the system has strong data processing functions and can process the digitized waveform and save sampling data. The DSO provides users with the functions of automatic parameters measurement, cursor measurement, analysis of frequency spectrum and multi-trigger modes. The user interface is similar to that of an analog oscilloscope, but with improvements that reduce learning time and increase efficiency.With the digital signal processor as CPU, the performance of digital processing has been enhanced and a large number of data can be analyzed rapidly. These functions demonstrate the advantages of DSO and also provide more convenience for the users. The purpose of this paper is to design a high-performance portable DSO.