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:
Feb. 22, 1994
Filed:
May. 21, 1992
Akihiro Sakurai, Isehara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Since a plurality of AC power supplies have output voltages controlled independently from each other and separate reference potential bus bars are connected with reference potential terminals of a plurality of DC power supplies connected with the different AC power supplies, respectively, power supply ripples contained in DC supplied to an electronic device can be reduced and it is possible to suppress generation of a beat produced by the fact that power supply ripples having frequencies deviated from each other interfere with each other. In this way fluctuations in the voltage of DC supplied to the electronic device are decreased and a working margin test for LSIs within the electronic device can be effected easily with a high reliability.