The Design And Realization Of Multi-channel Data Acquisition System

The development of science and technology can not depart from the improvement of test means. Along with the development of modern science and technology, the requirement to test instruments is higher and higher. Multi-channel Digital Storage Oscilloscope play a more and more important role in the field of measurement. But high sampling rate Multi-channel Digital Storage Oscilloscope technology is monopolized by few famous foreign firms, so independently design of high sampling rate Multi-channel Digital Storage Oscilloscope is very necessary.The Multi-channel Digital Storage Oscilloscope employs FPGA + DSP framework, with the high-speed A/D front-end sampling to achieve overall design. This paper first introduces the characteristics of Digital Storage Oscilloscope and development status, then discussed the main problems in Four-channel Data acquisition system, the specific contents include:1. According to the requirements of Four-channel Digital Storage Oscilloscope discuses the selection of the main components and introduce their characteristics.2. Data acquisition and trigger circuit design. Emphasizes on A/D sampling circuit's realizing, mainly including the sampling clock design and control circuit design. Then introduces the high-speed data storage with different phases, and design how to uniformity displaying the waveform. Finally introduces the trigger circuit design, emphatically discusses trigger holdoff, pulse width trigger, slope trigger and video trigger circuit design.3. For Signal integrity, put forward several problems in wiring and design. Then introduces the importance of the FPGA synchronization design and bing up the synchronization design principles. Meanwhile, according to LVDS via problem in PCB wiring, use the internal inverter in FPGA as a solution to this problem.