AAnand928 said:

My understanding was input offset voltage was too low like 0.1mV

Where did you get this value from? In datasheet of AD8541/8542/8544  says that offset voltage equal 1mV typically

I have already said what needs to be done. You should limit…

Dear Scott (and other Analog stuff):

as I mentioned, I am about to test the circuit. I've been reading a lot of datasheets, application notes and articles from Analog Dialogue and Planetanalog.com.

I have prepared final schematic of the ECG/EEG…

解决方案二：利用AD8210 和外部器件进行高端电流检测

图2a 所示为集成高压双向分流监控器AD8210 的简化框图；图2b 所示为采用外部基准电压源的单向应用。

图2. (a) 高压双向分流监控器AD8210；(b) 采用外部基准电压源的宽范围单向应用

AD8210 可以放大正或负电流流过分流电阻时产生的小差分输入电压，同时抑制高共模电压（最高65 V），并提供以地为参考的缓冲输出。

如图2a 所示，它主要包括两个模块：一个差分放大器和一个仪表放大器。输入端通过R1 和R2 连接到差分放大器A1…