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, 2000
Filed:
Jan. 02, 1998
Motorola, Inc., Schaumburg, IL (US);
Abstract
A digital-to-analog converter (200) has a first portion (208) which receives a digital input signal X (201') and has serially coupled a second portion (209) which provides an analog output signal Y (202'). The first portion (208) is a delta-sigma modulator with integrators (210 and 215), adders (203 and 205), a comparator (220) and delay stages (230 and 235). The second portion (209) comprises a commutator (260), unit converters (280-n) and an analog adder (290). In the second portion, the unit converters (280-n) can be mismatched. The first portion (208) provides a noise-shaped intermediate signal V (221') which has substantially zero noise at that frequencies where the mismatches would lead to unwanted spectral tones.