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:
Jul. 17, 1990
Filed:
Aug. 07, 1989
Win-Chyi Chang, Penfield, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A method is disclosed for testing a charge-coupled device (CCD). A test device for use in the method includes a buried channel transistor which is formed adjacent the CCD. The source and drain of the transistor are located on opposite sides of the CCD. In the use of the test device to locate barriers and pockets in the CCD, clock voltages that are used in the operation of the CCD are applied to the gate electrodes of the CCD to simulate the transfer of charge from one phase to another. Predetermined voltages are then applied to the transistor, and the drain current and source voltage are measured in order to construct curves which indicate the existence and size of the barriers and pockets.