According to the data sheets OPA2188 has more than twice the noise as ADA4528-2. But the test results are just the opposite. ADA4528-2 may have more current noise. But the calculated current noise cannot explain what observed.
Can you provide more details of your setup? Also a screenshot of your circuit will be great.
How are you calculating current noise?
There is a 10Meg resistor in the feedback loop. 10Meg X 10 pA = 100 uV p-p. But the noise is 2mV p-p.
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