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. 19, 2005
Filed:
May. 29, 2002
Kazuhiko Shirakawa, Nara-ken, JP;
Kazuhiko Shirakawa, Nara-ken, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
In a semiconductor apparatus, a plurality of HBTs (heterojunction bipolar transistors) are formed on a front surface consisting of a (100) crystal plane of a GaAs substrate. Via holes passing thorough the GaAs substrate are formed in proximity of the HBTs. Each via hole has a rectangular-shaped hole edge at the front surface side of the GaAs substrate. The longitudinal direction of the hole edge on the surface side of the via hole is parallel to the [011] direction of crystal orientation of the GaAs substrate. A width of the via hole in a direction perpendicular to the [011] direction of crystal orientation is larger at the back surface of the substrate than at the front surface thereof.