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. 08, 2009
Filed:
Aug. 01, 2006
Hiroyuki Hagiwara, Isesaki, JP;
Atsushi Motozawa, Ashikaga, JP;
Haruo Kobayashi, Kiryu, JP;
Hao San, Kiryu, CN;
Hiroyuki Hagiwara, Isesaki, JP;
Atsushi Motozawa, Ashikaga, JP;
Haruo Kobayashi, Kiryu, JP;
Hao San, Kiryu, CN;
National University Corporation Gunma University, Gunma, JP;
Abstract
A high-precision ΔΣ modulator reduces nonlinear noise due to the use of a multibit DAC and has little hardware and power consumption. A digital signal is DA converted and fed back to a subtraction circuit supplied with an analog signal. The DAC used in this feedback circuit uses a DAC (DWADAC) that includes a weighted pointer so that input digital signals are supplied in order to a plurality of segment elements that construct the DAC. In this DWADAC, the construction and number of the pointer is set based on the type and order of the filter disposed before the ADC.