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现代测控系统对测量信号的处理基本由数字技术完成,A/D转换器的性能对系统具有重要的影响.采用SDM(∑-?调制器)实现A/D转换器,省略复杂的数字抽取滤波器,由DSP和CPLD对SDM输出的高速码流处理,实现A/D转换.DSP软件编程可以控制CPLD的计数器,实现可变精度(和速度)的A/D转换.通过对SDM特性分析,得到转换方法及计算公式,最后设计电路实现要求的功能.实验实现了最高16位A/D转换,很好地证明了设计分析的结论.
Modern measurement and control system on the measurement signal processing basically completed by the digital technology, A / D converter performance has an important impact on the system. Using SDM (Σ-? Modulator) to achieve A / D converter, eliminating the complexity of the digital extraction filter Device, DSP and CPLD to SDM output high-speed stream processing, to achieve A / D conversion .DSP software programming can control the CPLD counter to achieve variable precision (and speed) A / D conversion.Through the analysis of SDM characteristics, Get the conversion method and calculation formula, and finally design the circuit to achieve the required functions.Experiments achieved the highest 16-bit A / D conversion, a good proof of the design analysis of the conclusions.