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在INA149手册第17页有一个“ERROR BUDGET ANALYSIS”分析的图标，
问题是：图表中的265V/90dB=8380uv是怎么算出来的？
因为 90dB 大约是 30000 倍
dB和V还是20倍的log关系。
比如90dB的话，10^（90dB/20）约等于31622. 那么265/31622=8380uV。
