houly
Advanced Member level 4
hello
I would want to know what is the function of theis particular feedback circuit ... ?
and how can I calculate it ? I can consider the photodiode as a current generator ... because we are in linear mode and V+=0v, V- is equal to 0V too. so does this equivalent schematic is good ? I'm not sure that I can consider that because the current generator should also be shorted to the ground ?!
here is the original schematic
here is my equivalent 1 and 2 schematics to calculate the ouput with all elements.
whith virtual ground of the op amp, we should have :
without considering the virtual ground, we should have :
I hope that someone could help me to understand the aim of the feedback and how can I calculate it.
I would want to know what is the function of theis particular feedback circuit ... ?
and how can I calculate it ? I can consider the photodiode as a current generator ... because we are in linear mode and V+=0v, V- is equal to 0V too. so does this equivalent schematic is good ? I'm not sure that I can consider that because the current generator should also be shorted to the ground ?!
here is the original schematic
**broken link removed**
here is my equivalent 1 and 2 schematics to calculate the ouput with all elements.
whith virtual ground of the op amp, we should have :
**broken link removed**
without considering the virtual ground, we should have :
**broken link removed**
I hope that someone could help me to understand the aim of the feedback and how can I calculate it.