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. 05, 1989
Filed:
Feb. 26, 1988
Mitsutoshi Sugawara, Tokyo, JP;
Nami Inamasu, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
For reduction in component elements, there is disclosed a digital-to-analog converter circuit for converting a digital input signal consisting of high-order bits and low-order bits into an analog output signal, comprising, (a) a first digital-to-analog converting circuit operative to produce a first current the amount of which corresponds to a value represented by the high-order bits, (b) a memory circuit storing an error data information in each address specified by each of values represented by the high-order bits, (c) an arithmetic circuit operative to carry out arithmetic operations on the low-order bits and the error data information to produce amended low-order bits, (d) a second digital-to-analog converting circuit operative to produce a second current the amount of which corresponds to a value represented by the amended low-order bits, and (e) an analog adder operative to add the first current weighted by a predetermined factor to the second current to produce an analog output signal, so that the analog output signal precisely corresponds to the digital input signal.