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How to choose an opamps for my project

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snishanth512

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My project is about acquisition of Photoplethysmography (PPG measured from fingertip) which is a biomedical signal obtained from phototransistor (IR led (940nm) as emitter) .

Output is a current signal.

How can we measure a current signal in the range of micro amps?

So, I need to amplify the current signal. Because current is in the range of micro amps.

I got above output using ICVS amplifier or transresistance amplifier.

I measured using DSO.

How to choose an opamp for this project?
 

Get a copy of this book: "Photodiode Amplifiers" by Jerald Graeme. There is more to it than just picking an op-amp.
 

Since it's a biomedical signal, I assume it's a low frequency signal, so the op amp frequency response should not be an issue.

How far will the op amp be from the signal source?

Do you want the signal amplified to some typical value such as 5V full-scale? What will you do with the amplified signal?

Do you have a power supply available or is that to be determined?

Is this to be for one experimental setup, or for multiple manufactured devices?
 

I need to detect the peaks of the signal (i.e.) heart beat.

I am using 9v battery and 7805 voltage regulator.
 

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