Research On The Ultra High Speed Data Acquisition System

With the development of modern electrical laboratory, communication and image acquisition, higher and higher acquisition speed and precision are recommended. But the speed of ADC is constraining the development of acquisition system. Usually we use some method with low speed ADC to satisfy the high speed requiment. For example, the equivelent sampling technologh sampled only once in one or several cycle times, and use the repeatability of cycle signal to reform the whole wave. But that method is only suitable for cycle signal. My aim is to find a high speed acquisiton method which is suitable for all kinds of signals.The time interleaved ADC system works as: M parallel ADCs work with a sampling frequency fs/M and the system output are multiplexed together. This gives an overall sampling frequency fs. The drawback with this structure is the channel mismatch errors will occur in the system. These mismatch errors will degrade the system performance if they are uncorrected, and the correction is a complex work. It's recommended to use one piece of ADC in ultra high-speed data acquisition system.The work of this paper is introduced as follow: First, analysing the actuality and future of A/D chip and data acquisition system; Second, researching the revise arithmetic of non-uniform data acquisition based on two channel parallel A/D; Third, introducing a system using two pieces of A/D sampling time-sharing, then offering another one using one piece of ultra high-speed A/D; Final, explaining the key points of setup of ultra high-speed data acquisition system.