i need to amplify the avalanchi photo diode current signal. i used the opa656 current to voltage amplifier to amplify. but output signal contain high noise so please tell to me how to remove the noise. thank you.
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Hi Tharindu,
You can use the below TINA-TI circuit for simulating the photo diode component.
In the below TINA-TI circuit, you could set the R3 as 0-ohms and R1 as 2Mohm the way you have shown to get a very high gain output of the second stage. However, I would not recommend doing that because the part would be amplifying a lot of noise and would eventually rail the output. Also, the cascaded gain will be so high that it is practically not feasible.
I have used a more reasonable Rf and Rg of 250-ohms on the second stage which sets its gain at -1. You could play around Rf and Rg to get a higher gain value if needed.
Best Regards,
Rohit