How to design ~2uA current low speed instrumentation amplifier using 3 op amp schematic (https://en.wikipedia.org/wiki/Instrumentation_amplifier) ?
Now in-amp current depends on feedback resistors values.
How big resistors values can be selected to have lowest current and stable in-amp performance?
In reply to Thomas Kuehl:
So we can decrease current to 1uA of R7/R8 divider. i understand the answer is yes?
And some small capacitor will help to lower noises.
Instrumental amplifier with TLV8812 works fine. We tested.
Now we will try to use TLV8812 for potentiostat circuit. I will inform the results.
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In reply to Vaidas Serpetauskas:
It is good hear the TLV8812 is working well meeting the very low operating current INA portion of the application. It should work well in the potentiostat application as well. The very low +/-100 fA input (typ) bias current is ideal for that application.
Please do let us know the results you receive from the TLV8812 for the complete application.
Precision Amplifiers Applications Engineering
Also keep in mind if your desire is only 1Hz, you are now in the 1/f noise region, up to 500nV at 1Hz with the TLV8811. Maybe should run an output SNR for the whole thing,
There was an earlier file using the LPV821 showing 2Vpp, that is 0.707Vrms for the SNR simulation. Might try something like this with your current circuit.
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