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1. WO2004006440 - DELTA-SIGMA MODULATION CIRCUITS AND METHODS UTILIZING MULTIPLE NOISE ATTENUATION BANDS AND DATA CONVERTERS USING THE SAME

Publication Number WO/2004/006440
Publication Date 15.01.2004
International Application No. PCT/US2003/011777
International Filing Date 16.04.2003
Chapter 2 Demand Filed 06.02.2004
IPC
H03M 3/00 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
3Conversion of analogue values to or from differential modulation
H03M 7/36 2006.01
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING, DECODING OR CODE CONVERSION, IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same information is represented by a different sequence or number of digits
30Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
36Conversion to or from differential modulation with several bits, i.e. the difference between successive samples being coded by more than one bit
CPC
H03M 7/3006
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same ; , similar or subset of; information is represented by a different sequence or number of digits
30Compression
3002Conversion to or from differential modulation
3004Digital delta-sigma modulation
3006Compensating for, or preventing of, undesired influence of physical parameters
H03M 7/3026
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same ; , similar or subset of; information is represented by a different sequence or number of digits
30Compression
3002Conversion to or from differential modulation
3004Digital delta-sigma modulation
3015Structural details of digital delta-sigma modulators
302characterised by the number of quantisers and their type and resolution
3024having one quantiser only
3026the quantiser being a multiple bit one
H03M 7/304
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
MCODING; DECODING; CODE CONVERSION IN GENERAL
7Conversion of a code where information is represented by a given sequence or number of digits to a code where the same ; , similar or subset of; information is represented by a different sequence or number of digits
30Compression
3002Conversion to or from differential modulation
3004Digital delta-sigma modulation
3015Structural details of digital delta-sigma modulators
3031characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path
3033the modulator having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs
304with distributed feedback, i.e. with feedback paths from the quantiser output to more than one filter stage
Applicants
  • CIRRUS LOGIC, INC. [US]/[US]
Inventors
  • MELANSON, John, Laurence
Agents
  • MURPHY, James, L.
Priority Data
10/191,01608.07.2002US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) DELTA-SIGMA MODULATION CIRCUITS AND METHODS UTILIZING MULTIPLE NOISE ATTENUATION BANDS AND DATA CONVERTERS USING THE SAME
(FR) CIRCUITS DE MODULATION DELTA-SIGMA, PROCEDES FAISANT APPEL A PLUSIEURS BANDES D'ATTENUATION DE BRUIT, ET CONVERTISSEUR DE DONNEES FAISANT APPEL A CEUX-CI
Abstract
(EN)
A noise shaper including a filter system (501a, 50b) for generating a first set of poles and zeros characterizing noise attenuation in a signal baseband of a noise transfer function and at least one additional set of at least one pole and one zero characterizing noise attenuation in at least one additional band outside the baseband of the noise transfer function.
(FR)
L'invention concerne un modulateur de bruit comprenant un système de filtre (501a, 50b) permettant de générer un premier ensemble de pôles et de zéros caractérisant une atténuation de bruit dans une bande de base de signal d'une fonction de transfert de bruit, et au moins un ensemble supplémentaire comportant au moins un pole et un zéro, caractérisant une atténuation de bruit dans au moins une bande supplémentaire, située à l'extérieur de la bande de base de la fonction de transfert de bruit.
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