摘要
针对模拟信号采集电路的误差分析,设计了一种充分考虑各级电路误差的最坏情况分析法。主要分析了影响精度和灵敏度的直流误差。忽略传感器、电缆、连接器、PCB寄生电容和任何外部影响/误差,因为这些误差在很大程度上取决于要测量的具体应用或信号。主要分析模拟采集电路中的典型构建模块,如电阻、放大器、模数转换器等。提出了基于反馈因子β的运算放大器误差模型,模型通过反馈因子而获得分析能力,反馈决定了运算放大器在功能和质量方面的性能,通过与开环误差规范的反馈交互实现。对于电阻和模数转换器主要分析其特性误差。采用最坏情况分析法,将可靠性落实到硬件设计中,使得硬件可以长期无故障工作。
Aiming at the error analysis of analog signal acquisition circuit,a worst-case analysis method that fully considers the error of each stage circuit is designed.The dc error that affects accuracy and sensitivity is mainly analyzed.Ignore sensors,cables,connectors,PCB parasitic capacitance,and any external influences/errors,as these are highly dependent on the specific application or signal to be measured.It mainly analyzes typical building blocks in analog acquisition circuits,such as resistors,amplifiers,analog-to-digital converters,etc.An op amp error model based on feedback factorβis proposed,which obtains analytical ability through feedback factor,which determines the performance of op amp in terms of function and quality,and is realized by feedback interaction with open-loop error specification.For resistors and analog-to-digital converters,the characteristic error is mainly analyzed.Worst-case analysis is used to implement reliability into the hardware design,so that the hardware can work trouble-free for a long time.
作者
白晨
刘斌
韩国璇
BAI Chen;LIU Bin;HAN Guo-xuan(Xi′an Aeronautics Computing Technique Research Institute,AVIC,Xi′an 710000,China;Air-equipped Military Representative Office Stationed in Hanzhong Region,Hanzhong 723000,China)
出处
《航空计算技术》
2023年第6期92-95,共4页
Aeronautical Computing Technique
基金
航空科学基金项目资助(2020Z069031001)。
关键词
模拟信号
采集电路
误差分析
最坏情况分析法
analog signals
acquisition circuits
error analysis
worst-case analysis
