Boosting AD8642 output current

I'm testing a design in which I need to do a current to voltage conversion. The current ranges from picoamperes to 100mA (both positive and negative), so I use 4 different resistors and a switch to select each of them. I filter the corresponding signal (not shown in the image), use a variable gain (x1, x10, x100, x1000) amplifier and then adapt it and detect it. 

Everything works perfectly fine till 20mA, the op amp output current limit. Can anyone please show me a simple power stage that can be used preferibly inside the feedback loop? The output voltage has to be between -5 and +5 volts and has to work for +-100mA.

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    •  Analog Employees 
    on Aug 2, 2018 4:54 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:54 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
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