So, I'm curious if there is a way to make a single-supply transimpedance amplifier op-amp circuit that uses a single supply. One thing that is important to me here is that it does not use a dc offset. This is because, if I were to ever use the circuit, it would be amplifying a steady dc signal! Just to clarify, I have no specific purpose for this at the moment. But I have certainly had one in the past!
If the input current signal (this feeds the inverting input) is always negative i.e. current flows away from inverting input, then the op-amp's output will always be positive with respect to the inverting input and this means a true ground referenced TIA. This sort of configuration sounds a trifle limiting but if the input is a photodiode then it works perfectly well provided: -
- The photodiode is connected the correct way round
- You allow for the op-amp's output not being able to swing perfectly down to exactly 0V
For #2 a rail-to-rail op-amp is a must but even these can be helped with a small negative supply (circa -100 mV) just to make the output linear down to true 0V/ground.