Why does the input bias current of part such as AD8210, AD8211, AD8213, and AD8215 vary with input common mode voltage?

See attachment. 

Eng_Zone_input_Bias_Current.docx
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  • This important information is very well hidden! A hint in the data sheet (section Applications Information, paragraph HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE SWITCH) would have saved us from quite some time searching for the mistake in our circuit.

    Glad to have found the explanation now, anyway. Thanks.

Reply
  • This important information is very well hidden! A hint in the data sheet (section Applications Information, paragraph HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE SWITCH) would have saved us from quite some time searching for the mistake in our circuit.

    Glad to have found the explanation now, anyway. Thanks.

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