In the application of ADA4530-1, TIA board is not stable when i choose the value of feedback resistance is more than 1 G ohm. For example, the current supply gives a standard signal that is zero. However, i receive signal out that is more that 3.9V. The power supply is ±5V.
This phenomenon happens not just on the circuit board that is designed by myself but also happens on ADA4530-1R-EBZ board which i bought on Mouser. However, sometimes the function is quite well. I didn't clean the board following the steps as UG-865 saying. I wonder whether the problem is because i haven't cleaned them. Please give me some advice. Have you found the similar problem in your test.