OPA855: Multiple path amplification of SiPM

Dear fellows,

I am trying to design a readout circuit of SiPM for ToF. The first stage is TIA circuit using OPA855 (gain 50ohm) and tested okay.

The thing is, due to the application requirement, I need to get the signal amplified by different scale. And due to space constraint, I cannot use multiple sensors.

So, I want 3 second-stages in parallel, with the gain of  ~1x, 5x, 20x .

My question is how do I couple 3 amplification with the same first stage? Is there a standard procedure for this kind of design?

I tried to simulate using Tina, but it generates errors.

Links：

Unfortunately, we also don't have the guidance for you.

To solve your issue, we recommend that you post your question on the English E2E support forums（https://e2e.ti.com/p/addpost）, which will be assisted by experienced experts.

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