Automatic calibration method of multi-component synchronization for ultra-fast parallelized sampling systems

Parallel sampling technology is widely used in the design of high-speed data acquisition system in fields of modern radar, broadband communication, test and measurement, etc. With the rapid increase of sampling rate requirement, the number of parallel analog-to-digital converters (ADCs) in time-interleaved based sampling system is increasing, which makes the multi-component synchronization technology for this system become an important problem to be solved urgently. Aiming at the common parallel bus transmission mode, this paper proposes a technical solution with the automatic calibration function of multi-component synchronization for ultra-fast sampling, which includes several system architectures of multi-ADC synchronous reset, multi-channel parallel data receiving and multi-FPGA real-time processing. And then its automatic calibration is implemented by the way of segmental training and statistical identification. Finally, a dual-channel 20GSPS sampling system is established by employing eight 5GSPS ADCs and nine FPGAs to verify the feasibility. Experimental results show that the solution can not only realize the independence automatic calibration, but also eliminate the effects of ambient temperature variation. Therefore, the proposed solution has high stability and practicability for ultra-fast parallelized sampling system with the transmission mode of common parallel bus, and is helpful to the synchronization design of larger scale sampling system as well as related integrated circuit.