Abstract
The time lapse between the injection of the primary carrier and the termination of the resulting avalanche current in an APD is a random variable. Its distribution is calculated allowing for the effects of carrier diffusion and also for an arbitrary distribution of ionization events in both space and time, following primary carrier injection. While diffusion plays a secondary role, it is found that the enhancement in the average speed of those carriers which ionize early in their trajectories speeds up the avalanche process significantly in short devices.
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