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:
Dec. 30, 1997
Filed:
Apr. 01, 1996
Seiji Koyama, Yamato, JP;
Tohru Nozawa, Sagamihara, JP;
Asao Terukina, Yamato, JP;
Yasusuke Suzuki, Kanagawa-ken, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A D/A converter of a current output type desirably compensates for changes in the switching characteristic that arise in each constant current circuit. The D/A converter generates an analog output current that is in response to the level of input digital data and outputs it from an output side by switching each of output currents of a plurality of constant current circuits either to the output side or to a non-output side, in response to the input digital data. The D/A converter performs feedback control, for values of the output currents for the constant current circuits, based on an analog output current at the non-output side during a period when the output currents of all of the constant current circuits are connected to the non-output sides.