I am looking for an operational amplifier which will fit my requirements.
My circuit consists of two cascaded non-inverting amplifiers.I have a classical non-inverting setup.The minus pin of both stages is at ground potential. My positive input to the first stage is a voltage that can be in uV region, therefore the op-amp needs to be able to operate as expected at this level.
I have a single supply voltage of +3.3v, no split rail, my input is always a positive voltage.
I need the amp to have the following characteristics:
Low noise, Ultra low offset, Low power, True Rail/Rail IO, Should work in a single supply of 3.3V
Any suggestions for an op-amp for my requirements? I have tried a MAX4239 but it seems not to work as expected when the positive input is only a few uV, the output load is a comparator input and an ADC input. VGND in schematic is GND