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OPA855: Multiple path amplification of SiPM

Part Number: OPA855

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.