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Tool/software:
Hello TI teams,
Firstly hope all is doing well.
In the case of the implementation of a TIA for SiPM sensor application I tried to simulate a dummy TIA circuit using OPA855 but the output gain is unexpected (very low) as it would be approx Vout = Vd-1000*1mV = 1V when the current source is on. Could you help me with this ?
Here is also the schematic picture.
Have a nice day,
Simon
Hi Simon,
I saw that you posted more recently, so maybe you've moved past this already, but I tried your setup and wasn't able to replicate your odd result. Below I included a screenshot and the file of my results and circuit configuration, let me know if I missed something about your setup.
I wanted to mention that the large overshoot visible in Vout is a result of having no feedback capacitance and source capacitance. I linked a TIA calculator below, which can be used to calculate the feedback capacitor value.
I don't know what SiPM sensor you are using, but I wanted to warn you that you may need to configure the OPA855 as a standard voltage feedback instead of as a TIA, because many have a voltage output. Feel free to link the datasheet and let us know your requirements if you would like us to take a look at it and help to configure it.
Sim file:
Calculator:
Best,
Hypatia
