Instruments offset due to RF EMI

J. Gago, J. Balcells, D. González, L. Ferrer, M. Lamich
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Abstract

One of the main error sources in instruments and sensors are electromagnetic interferences, EMI, acting on linear ICs at the detection and pre-conditioning stages. High frequency interferences with random amplitude cause a DC offset and a ripple due to noise amplitude modulation. This paper is devoted to study the effects of EMI on OPAMP offset. After several tests, a qualitative model for offset prediction is derived. A set of tests allows obtaining the model parameters, which depend on OPAMP type and circuit impedances. Such parameters allow the comparison of susceptibility between different OPAMP types. The model also allows the quantification of improvements when certain set up changes are introduced.
由于射频电磁干扰造成的仪器偏移
仪器和传感器的主要误差来源之一是电磁干扰,即EMI,它在检测和预处理阶段作用于线性集成电路。具有随机振幅的高频干扰由于噪声调幅而引起直流偏置和纹波。本文主要研究了电磁干扰对OPAMP偏置的影响。经过多次试验,推导出了偏移量预测的定性模型。一组测试允许获得模型参数,这取决于OPAMP类型和电路阻抗。这些参数允许比较不同OPAMP类型之间的磁化率。该模型还允许在引入某些设置更改时对改进进行量化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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