I want to design a photodiode current amplifier circuit. The photodiode is Hamamatsu S5973 and the operational amplifier is AD8001. After proofing the PCB board, it is found that the light has no effect on the output voltage of the circuit.
Leonardo 發表於 July 27, 2020
Current cannot be sampled directly, it is usually converted into voltage for indirect sampling. There are some problems in the design of the above drawings. You can consider differential sampling at both ends of the photodiode.
Angela 發表於 July 27, 2020
The input bias current of the op amp is higher than the working current of the photodiode, the op amp cannot work.
Quinn 發表於 July 27, 2020
If the circuit is correct, it is recommended to re-adapt the op amp.
