Ronnie
Junior Member level 1
hello,
Can anyone explain the theory of operation of the attached circuit, I saw allot of application notes explaining that in this connection there is no voltage across the photo diode- only current, but if there is no voltage across the diode-what produces the current? Also my basic understanding of op amp is that slight voltage between the + and - pin will produce a voltage at the amplifier output. how does this settle with the idea that there is no voltage across the diode?
I also don't have any equations for this circuit.
If anybody can help me I will be grateful.
Thanks
Can anyone explain the theory of operation of the attached circuit, I saw allot of application notes explaining that in this connection there is no voltage across the photo diode- only current, but if there is no voltage across the diode-what produces the current? Also my basic understanding of op amp is that slight voltage between the + and - pin will produce a voltage at the amplifier output. how does this settle with the idea that there is no voltage across the diode?
I also don't have any equations for this circuit.
If anybody can help me I will be grateful.
Thanks