Modeling of Timing Jitter for Single Photon Avalanche Diodes

Abstract

Timing jitter is an important indication reflecting on the performance of single photon avalanche diodes (SPADs). In this paper, an analytical model is established to predict the temporal response characteristic of SPADs based on the physical progress of photon absorbing and avalanche triggering. The diffusion and drift of carriers in the neutral layer are considered by solving the continuity equation for exponential tail modeling. A Gaussian distribution is used to model the peak response corresponding to photon absorption in avalanche region. The model key physic parameters such as electric field and avalanche triggering probability come from TCAD simulation, which improves the model accuracy. This analytical model is useful to predict the temporal response for given SPAD device structure.