Glossary Definition for APD

Glossary Term: APD 

Definition

Avalanche Photo Diode: A photodiode designed to take advantage of avalanche multiplication of photocurrent to provide gain. As the reverse-bias voltage approaches the break-down voltage, hole-electron pairs created by absorbed photons acquire sufficient energy to create additional hole-electron pairs when they collide with ions. Thus a multiplication or signal gain is achieved.
Synonyms
  • Avalanche Photodiode
  • Avalanche Photo Diode

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