The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2017
Filed:
Aug. 25, 2015
Applicants:
Noah Gottfried, Johnsonburg, NJ (US);
Christopher Mesibov, Airmont, NY (US);
Inventors:
Noah Gottfried, Johnsonburg, NJ (US);
Christopher Mesibov, Airmont, NY (US);
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 40/14 (2006.01); H04B 10/69 (2013.01); H03F 3/45 (2006.01); H01L 31/09 (2006.01); H01L 31/02 (2006.01); H04J 14/02 (2006.01);
U.S. Cl.
CPC ...
H04B 10/6911 (2013.01); H01L 31/02016 (2013.01); H01L 31/09 (2013.01); H03F 3/45071 (2013.01); H04B 10/6931 (2013.01); H04B 10/6933 (2013.01); H04B 10/6971 (2013.01); H04J 14/021 (2013.01); H03F 2203/45116 (2013.01); H03F 2203/45212 (2013.01);
Abstract
Methods and systems for replicating high bandwidth current outputs from a photodetector or another current source include using a transimpedance amplifier (TIA) to directly generate a TIA voltage that is linear with optical power at the photodetector. The TIA voltage is used to generate a current that flows to a log amp, which generates a voltage that is linear with the optical power in dB. Additionally, offset cancellation is used at the TIA and at the log amp.