Hi
I am using an OPA 637 in transimpedence amplifier configuration. According to the datasheet, this opamp is stable for gain>5. I am using a feedback resistor of 300K. The photodiode capacitance Ci is 10pF. However, I am getting oscillation sometimes around 11 Mhz like sinewaves and sometimes around 60kHz like squarewave. I found that including a feedback capacitor Cf would decrease the noise gain. But in my configuration, the input capacitance of the photodiode is providing a high-frequency noise gain of 6 (1+Ci/Cf ) if I used a capacitor of 2pF at the feedback. Still, I am getting oscillation.
Can anyone help me to stabilize the op-amp?
Can anyone help me to remove oscillation?
My schematic is attached