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:
Nov. 04, 2003
Filed:
Nov. 06, 2000
Shinichi Tsuyuki, Kamisato-machi, JP;
Toshiaki Ogura, Honjyo, JP;
Hitachi Electronics Engineering Co., Ltd., Tokyo, JP;
Abstract
When performing supply and measurement of various signals on n=8 semiconductor IC devices under test DUT -DUT using m=3 substrates reference voltages of the devices under test DUT -DUT are input to the substrate reference voltages of the devices under test DUT -DUT are input to the substrate and reference voltages of the devices under test DUT and are input to the substrate The reference voltages input to each substrate are averaged. The mean voltages made in each substrate are further connected to each other, and a reference voltage is made using three substrates The reference voltage is used as a reference voltage for voltage generating circuits The reference voltage having no variation among each substrate is set even if the number of semiconductor IC devices under test is increased and the whole equipment becomes large.