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:
Mar. 30, 1999
Filed:
Jun. 03, 1997
Hiroshi Hirabayashi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A cross-talk source isolator is provided in an integrated circuit which has an impurity diffused substrate of low resistance on which a silicon region is developed. A digital and analog circuits are formed on the silicon region. A trench is formed in the silicon region, in a direction substantially normal to a major surface of the substrate, in a manner to separate said digital and analog circuits. The trench has a bottom portion reaching the substrate and having an inner wall covered with a dielectric material. The trench includes therewithin an electrically conductive member which has a first end portion electrically connected to the substrate. Further, the electrically conductive member has a second end portion, opposite to the first end portion, coupled to an electrode which leads to a reference voltage source such as ground.