I need to detect a PPG signal from the finger.
I have decided the opamp stages .
But, I do not know to choose an opamp for the project.
Stages are current to voltage converter(input = 1 microampere (I guess)), amplifier (gain=1000), low-pass filter, high-pass filter, notch filter.
PPG signal obtained at the end of notch filter.
PPG signal frequency range is 0.9 to 2 Hz.
Since, I am working with biomedical signals opamp should overcome low frequency noises and high frequency noises effectively.