Hi Prabhu, The LOG114 is capable of developing very high transimpedance gain and low-level "noise" currents can be amplified greatly. The output can be contaminated with noise which end up with an output that is much different than expected. We find that when working with very low input current levels that we can't leave the PC board exposed to the open environment. There is just too much noise pick up; especially, line frequency noise. Most often, we end up putting the LOG114 PC board in a metal enclosure. We often include batteries in the enclosure when possible, or make extra efforts to assure effective bypassing of any power supply lines coming into the enclosure. The input and output connectors are BNC connectors. That accommodates coaxial cables which are a must to help shield the input and output signals from stray noise pick up. I am not sure if you mentioned you had seen the information about the LOG114 EVM, evaluation module. If you haven't, here a link to it: It might provide some additional applications information that you hadn't considered. Regards, Thomas PA - Linear Applications Engineering
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