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本文在分析差分放大器共模抑制特性的基础上,提出了放大器外电路电阻精度选择的依据和计算公式。在推导放大器CMRR值与外电阻精度的关系式时,运用了函数误差的计算方法。
Based on the analysis of the common-mode rejection characteristics of the differential amplifier, this paper presents the basis and calculation formula for the selection of the resistance accuracy of the external circuit of the amplifier. In deriving the relationship between the CMRR of the amplifier and the accuracy of the external resistor, a functional error calculation method is used.