Design of 16-channel high-speed synchronous data acquisition system

In modern important applications such as radar, communication and large-scale physical experiments, it is often necessary to acquire dozens of pulse signals at the same time for their data inversion analysis and physical mechanism disclosure. Therefore, a multi-channel high-speed synchronous data acquisition system is urgently needed as a support, and the sampling rate is expected to reach several GHz and the synchronization accuracy to be ps. However, the realization of such a system is also a difficult problem in the industry. A 16-channel synchronous data acquisition system with 5GSPS sampling rate is designed in this paper. Firstly, according to the multi-channel signal digitization and synchronization technology, a high-speed data acquisition scheme with high synchronization accuracy is proposed. Then, the key technologies implemented in the system are described in detail, including low-jitter clock generation and multi-channel synchronous allocation, multi-channel signal analog-to-digital conversion, high-speed parallel data synchronous transmission and trigger storage control, accurate calibration of interchannel synchronization, etc. Finally, through the design, debugging and testing of the specific circuit and software, the system is fully realized. The test results show that the system not only has 16 channels with 5GSPS sampling rate, 12-bit resolution and 2GHz bandwidth, but also the synchronization accuracy between channels can reach +/- 4.8ps that is at the highest level of existing products. It also shows that the design method proposed in this paper has high feasibility, which can provide a good reference for similar system design.