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:
Jun. 03, 2003
Filed:
Aug. 06, 2001
Applicant:
Inventors:
Shigeharu Kimura, Tokyo, JP;
Kenji Maio, Tokyo, JP;
Takeshi Doi, Kokubunji, JP;
Yoichi Tamaki, Kokubunji, JP;
Takeshi Shimano, Tokorozawa, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 2/714 ; H01L 3/100 ; H01L 3/106 ;
U.S. Cl.
CPC ...
H01L 2/714 ; H01L 3/100 ; H01L 3/106 ;
Abstract
A photo semiconductor integrated circuit device has a photodiode portion and amplifier portion, each portion having a buried layer. The impurity concentration and/or depth of the buried layer for the photodiode portion is lower than that of the buried layer for the amplifier portion. As a result, the frequency band width is widened.