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, 1983
Filed:
Apr. 25, 1980
Eugene S Schlig, Somers, NY (US);
IBM Corporation, Armonk, NY (US);
Abstract
A charge coupled device analog-to-digital converter includes a plurality of charge storage stages that are arranged in a serial pipeline register and are connected to pass input source charges from stage to stage down the pipeline register. A reference charge generator and a charge splitter at each stage generate two fixed reference signals. The first of the reference signals is compared by a comparator to a source charge that is temporarily stored at the stage. The comparator generates a binary 1 if the source charge is greater than or equal to the first reference charge and a binary 0 if the source charge is less than the first reference charge. If a binary 1 is generated, only the stored contents of the stage pass to the next successive stage. However, if a binary 0 is generated, the charge contents of the stage is passed to a next successive stage and the second reference charge is also passed by a transfer gate to the next successive stage, where the charges are combined. Buffer registers are provided to temporarily store the output bits of the comparators of the stages to form a digital word for each source charge packet as the packet and associated added charge components leave the pipeline.