Abstract
In this paper, a novel equivalent circuit model for the frequency performance
of separate absorption grading charge multiplication (SAGCM) avalanche photodiode
(APD) is developed. This model includes effects of carrier transit time, avalanche
buildup time, and parasitic ${\rm
RC}$ elements. Based on the equivalent circuit model, frequency
and bandwidth characteristics of SAGCM APD can be simulated in advance to
device fabrication, and the simulation results are in good agreement with
experimental data. Conventional pin photodiodes can also be simulated as a
special case when ${\rm
M}=1$. In addition, the frequency response of SAGCM APDs and
pin photodiodes with different illumination directions are investigated.
© 2009 IEEE
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