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Testing bandwidth of modern electronic signal has exceeded gigahertz, so the rate of high-speed data acquisition and storage put forward higher requirements. The existing analog to digital conversion (ADC) has only a few gigahertz acquisition rate and cannot meet the requirement of ultra high-speed sampling data acquisition module. The paper uses multi chip ADCs and breaks through a series of key techniques, such as alternating time sampling, clock phase calibration, high speed storage, etc. By using the existing high speed ADC, the data acquisition and real-time storage of up to 20GSa/s are realized.