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探讨电阻变化率对由3个运算放大器组成的仪表放大器输出端噪声的影响.把运算放大器噪声模型和电阻噪声模型代入仪表放大器电路,得到输出端噪声与电阻的关系式,通过列表分析,按不同的电阻比筛选出对输出端噪声影响显著的电阻.orCAD软件的仿真结果验证了分析是正确的.
The influence of resistance change rate on the output noise of the instrumentation amplifier composed of three operational amplifiers is investigated.The op amp noise model and the resistance noise model are substituted into the instrumentation amplifier circuit to obtain the relationship between the output noise and the resistance. Of the resistance than the filter out the noise output of the significant impact of resistance.orCAD simulation results verify the analysis is correct.