Offset current compensation for photodiodes

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United States of America Patent

PATENT NO 9366566
APP PUB NO 20150338269A1
SERIAL NO

14284965

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A dark photodiode that is optically isolated from the signal photodiode and having a dark current in the absence of photons. A reference generating circuit configured to produce a reference voltage based on voltage at an anode of the signal photodiode. A voltage regulator circuit configured to regulate dark photodiode voltage at an anode of the dark photodiode based on the reference voltage. A current mirror circuit configured to produce, at an anode connecting to the signal photodiode, a mirrored current that is a mirrored version of a portion of the dark current.

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Patent Owner(s)

Patent OwnerAddress
INTERNATIONAL BUSINESS MACHINES CORPORATIONNEW ORCHARD ROAD ARMONK NY 10504

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Frank, Matthew B Rochester, US 8 14
Richetta, Raymond A Rochester, US 28 222

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