Design And Realization Of Digital Storage Oscilloscope Base On Equivalent Sampling

Digital storage oscilloscope plays a more and more important role in every area of the electronics industry. By combining sampling principle, virtual instrument effectively, a low cost, portable, extensible and multifunctional digital storage oscilloscope system based on equivalent sampling which has been realized. FPGA provides the hardware foundation for the design and the main contents consist of analysis circuit design, digital logic design and software design.The study provides a detailed analysis of principle of the equivalent sampling and put forward several feasible implementations. With deeply analysis and comparison of these methods, a design combination of FPGA and hardware circuit is used to realize the system. And then a detailed description of the system design is provided to discuss the modules respectively and concrete circuit design. Quartus Ⅱ develop tool is employed to design and simulate the Digital logic circuit in the Field Programmable Gate Array in which the equivalent sampling design and module control included. Finally, user application program is realized with LabWindows/CVI, by which we can view and measure the signal wave form, and control the signal sampling process by sending command to the hardware circuit board.The digital storage oscilloscope system is elaborately tested in the practical application, and every function on the control panel is checked in detail. In the testing process, many technical difficulties are surmounted and the hardware circuit and the software program are both improved by handling the errors and problems. And finally the system digital storage oscilloscope performs very well and achieves initial design requirements.