An accurate model useful for simulating single-photon avalanche diodes including biasing circuits is presented. The authors developed the model using Verilog-A codes to describe both static and dynamic behaviours. The derived model fits experimental results extracted from practical devices better than the one used in the open literature.
In the last years, custom-technology single-photon avalanche diodes (SPADs) have demonstrated remarkable performance, thanks to the fine engineering process performed on the electric field profile. However, the integration of custom SPADs in detector arrays often conflicts with the low-threshold current sensing that is mandatory to extract the timing information.