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. 09, 2004
Filed:
Sep. 24, 2002
Applicant:
Inventors:
Assignee:
Sharp Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 4/014 ;
U.S. Cl.
CPC ...
H01J 4/014 ;
Abstract
A testing circuit , provided between an input terminal IN of an LSI and the CSA , includes a switch NSW (a third switch), a capacitor CT which is connected in parallel to the switch NSW, and switches TC (a first switch) and TC (a second switch) which are connected in series across the capacitor CT. With this arrangement, the circuit including the capacitor CT and the CSA can serve as a reverse amplifier circuit and can input a voltage waveform instead of the charges. Therefore, a conventional charge supply circuit is not necessary when the testing of a reading circuit is carried out.