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:
Apr. 13, 1993
Filed:
Sep. 19, 1991
Applicant:
Inventor:
Mitsuru Nagata, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341 76 ; 341143 ; 375 27 ;
Abstract
A digital sigma-delta modulator comprises an adder, a quantizer, a subtracter, a filter circuit, and a limiter circuit. The adder adds input digital data and feedback data. The quantizer quantizes output data of the adder. The subtracter calculates a difference between output data of the quantizer and that of the adder. The filter circuit digitally processes output data of the subtracter to generate the feedback data. The limiter circuit is arranged in at least one position within an operation loop looping the adder, subtracter, and filter circuit and extracts (n-m)-bit data acquired by eliminating the significant m bit other than MSB from an n-bit data line.