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. 10, 1992
Filed:
Oct. 15, 1991
Applicant:
Inventor:
Takeshi Ogawara, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341144 ;
Abstract
A digital-to-analog converting unit decodes a digital input signal into a decoded signal, and selectively allows constant-current cells arranged in matrix to supply unit currents for producing an analog output signal, wherein a decoding circuit incorporated in the digital-to-analog converting unit sequentially selects the constant-current cells in such a manner that insufficient increment of current produced by one of the constant-current-cells cancels out excessive increment of current produced by another constant-current cell so that the analog output signal is improved in linearity.