在TI噪声3中，有个总的输入相关噪声2490nV，是用宽带RMS噪声平方加上1/fRMS噪声平方，然后开方得到，紧接着又用电流噪声频谱密度乘以等效电阻，得到电压噪声频谱密度，转换成RMS噪声，这个RMS和前面的宽带RMS有什么区别
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