多工作模式Σ-Δ型ADC的设计  

Design of Σ-Δ ADC with multiple operating mode

作　　者：鲁千红[1] 黄建军[1] 李桂祥[1] 金加根[1] 

机构地区：[1]空军预警学院,武汉430019

出　　处：《空军预警学院学报》2015年第2期119-121,共3页Journal of Air Force Early Warning Academy

摘　　要：针对现有Σ-Δ型ADC芯片精度固定、无法测量内部波形,分析了Σ-Δ型A/D转换电路的工作原理,选择合适的参数,提出了一个多工作模式的Σ-Δ型ADC电路设计方案.该方案采用中小规模集成电路实现一阶Σ-Δ调制器、FPGA实现数字滤波器、单片机开发板实现波形和数据显示,用户可通过跳线设置其工作模式,并且可以用示波器观测关键点的波形.测试结果表明,该电路性能稳定,达到了设计要求.Aimed at the drawbacks that the precision of Σ-Δ ADC chips now available is fixed and its internal waveforms are unable to be measured and other drawback, this paper analyzes the operating principles ofΣ-Δ A/D converter and presents a design scheme of Σ-Δ ADC circuit with multiple operating modes by selecting proper parameters. In this scheme, the medium and small scale ICs are used for implementing the first order Σ-Δmodulator, FPGA is used for implementing digital filter and the PIC for implementing the waveforms and data display, the operating mode can be set by users using jumpers, and the waveforms at key points can be observed by using the oscilloscopes. The test results show that this circuit is of stable performance and achieves the design standards.

关 键 词：多工作模式 Σ-Δ调制器 A/D转换器 数字滤波 

分 类 号：TN713[电子电信—电路与系统]