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TLV2771: 輸入偏置電流及信號調理電路應用

Part Number: TLV2771

Hello

我在參考 " SLOA033A - Signal Conditioning Piezoelectric Sensors " 的文件第3頁中讀到電壓型放大電路必須加一個Rb來給予op直流偏壓的路徑(如下圖紅色框框處)

而這個Rb會因為流過Ibias而產生一個Voffset

文件提到如果Rb = 10 [MOhm] 會產生 Voffset = 60 [uV]的電壓(如下圖)

但是我看 Datasheet, 其 Input Bias Current 為 60 [pA]

那這樣的話他的輸出 Offset 應該為 10 [Mohm] * 60 [pA] = 600 [uV] 才對吧

還是我缺少了哪些沒有注意到的觀念呢

謝謝