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. 12, 2002
Filed:
Aug. 07, 2000
Multilevel analog to digital data converter having dynamic element matching in a reference data path
Applicant:
Inventor:
John Laurence Melanson, Austin, TX (US);
Assignee:
Audio Logic, Inc., Boulder, CO (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03M 1/60 ;
U.S. Cl.
CPC ...
H03M 1/60 ;
Abstract
In a delta sigma analog to digital converter, generally comprising a noise shaping filter element fed into a multilevel quantizer, the output of which is the output of the delta sigma modulator and is also fed through a digital to analog converter array in a feedback loop to the noise shaping filter, dynamic element matching circuitry is included in the quantizer, in a reference path. The quantizer includes dynamic element matching circuitry for shaping the usage of the elements of the quantizer. Specifically, reference voltages are switched to specific comparators according to control signals from switch control circuitry.