How to give input current of a TIA?

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You would start by looking at one and quantifying its interesting
features. But so far you have only shown an ideal source output.

Are you asking me to teach you basic SPICE? Seems you are
unwilling to read the manual.

An APD is a very finicky sensor and must be kept at the right bias
if you want multiplication, and a model worth anything would
have to emulate this and the excess noise / random false trigger
that lies on the other side of "just right".

In addition to not wanting to understand the simulator, it seems
looking for vendor support for a specific APD wasn't worth doing
either? Those are the people who ought to be giving you free
models as applications support.
 

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