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:
May. 31, 1994
Filed:
Sep. 03, 1991
Applicant:
Inventors:
Charles R Hoffman, Raleigh, NC (US);
John M Mullen, Wake Forest, NC (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01C / ; H01C / ; H01C / ; G06F / ;
U.S. Cl.
CPC ...
257369 ; 257500 ; 257392 ; 307469 ; 307496 ; 307451 ;
Abstract
The internal electrical noise generated by circuits of a VLSI chip is controlled by separating the logic circuit substrate contacts from the logic circuits ground contacts. A separate return path interconnects each contact to card ground. Further noise reduction is achieved by providing a void region between the noise generating devices and the 'quiet' devices. A substrate contact ring is provided in the void region. The substrate contact ring is connected by a separate path to card ground.