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Forum Post: LMP91000 Current Sensing Range extension

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Hi, since LMP91000 can read currents in the order of of 100 pA up to 750 uA. And the application I'm working on requires a sensitivity in the order of 0.5 pA / ppb, that is I need to measure a current of 0.05 pA for the lowest concentration possible. 

This low current is under the LMP91000 range, so I wonder if I can connect a LMP7721 in series with the WE electrode to preamplify this current and the allow the LMP91000 to capture this current. In the event a larger current occurs I would need to disconnect LMP7721...

I still need the LMP91000 for larger concentrations.

Thank you very much.

Regards,

Alejandro


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