基于SAR-ADC的精密同步数据采集系统设计

The design of a precision synchronous data acquisition system based on SAR-ADC

针对某精密数据采集系统中模拟信号同步采样问题,文章研究了多通道同步模拟信号采集方法,设计了一种基于SARADC、使用FPGA控制的16位同步采样AD转换系统。该系统可实现模拟信号的实时同步采样,同时兼顾多路模拟信号采样频率要求的差异性,最后通过试验测试了该系统的信纳比(SINAD)和有效位数(ENOB)。测试结果表明,该系统具有良好的动态性能指标。

For the problem of simultaneously sampling of multi-channel analog signals in a data acquiring system,the schemes of the system were discussed. Based on SAR-ADC,a kind of 16 bit AD convert system which controlled by FPGA was designed. The system could realize real-time synchronous sampling of analog signals. And the differences of sampling rate among multi-channel analog signals were well balanced in this system. The Signal to Noise and Distortion Ratio（SINAD） and Effective Number of Bits（ENOB） of the system were tested,and it was proved that the system can achieve good AC characters.