Design of Eight-Channel Synchronous High-Speed Data Acquisition System Based on Timestamp

Abstract

In response to the application requirements of high-precision synchronous acquisition of multiple complex signals in modern scientific devices such as communications, remote sensing, and physical experiments, we designed an eight-channel synchronous high-speed data acquisition system based on timestamps. First, by deploying the timestamp function of the analog-to-digital converter (ADC), combined with the adjustment of the sampling data sequence, adding a dynamic delay to the FIFO to achieve multi-ADC data synchronization; then, analyze the random delay between the channels of the single board by reading back the ADC setup/holding register status, and use the multiple cross-correlation phase difference measurement method to measure the inherent delay between the channels, and then adjust the output delay of the clock manager to complete the multiple correction of delay between channels; finally, Finally, through the precise delay adjustment of the control signal sent from the processing board to the acquisition board, the synchronous storage of the waveform data of the two acquisition boards with multiple FPGAs is realized. The test results show that the effective number of bits of all channels of the acquisition system designed in this article is greater than 8-bit, and the delay between the channels is within ±5ps, achieving the purpose of eight-channel synchronous acquisition.