BR9809163A - Processo e aparelho para modulação sigma-delta, e, processo e aparelho para conversão digital/ analógica - Google Patents

Processo e aparelho para modulação sigma-delta, e, processo e aparelho para conversão digital/ analógica

Info

Publication number
BR9809163A
BR9809163A BR9809163-8A BR9809163A BR9809163A BR 9809163 A BR9809163 A BR 9809163A BR 9809163 A BR9809163 A BR 9809163A BR 9809163 A BR9809163 A BR 9809163A
Authority
BR
Brazil
Prior art keywords
sigma
digital
delta modulation
analog conversion
delta
Prior art date
Application number
BR9809163-8A
Other languages
English (en)
Inventor
Mats Olof Fronnhagen
Per Henrik Fremrot
Original Assignee
Ericsson Telefon Ab L M
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ericsson Telefon Ab L M filed Critical Ericsson Telefon Ab L M
Publication of BR9809163A publication Critical patent/BR9809163A/pt

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M3/00—Conversion of analogue values to or from differential modulation
    • H03M3/02—Delta modulation, i.e. one-bit differential modulation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion 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
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3006—Compensating for, or preventing of, undesired influence of physical parameters
    • H03M7/3008—Compensating for, or preventing of, undesired influence of physical parameters by averaging out the errors, e.g. using dither
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion 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
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3015—Structural details of digital delta-sigma modulators
    • H03M7/302—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution
    • H03M7/3024—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only
    • H03M7/3028—Structural details of digital delta-sigma modulators characterised by the number of quantisers and their type and resolution having one quantiser only the quantiser being a single bit one
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion 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
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3002—Conversion to or from differential modulation
    • H03M7/3004—Digital delta-sigma modulation
    • H03M7/3015—Structural details of digital delta-sigma modulators
    • H03M7/3031—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path
    • H03M7/3033—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path the modulator having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs
    • H03M7/304—Structural details of digital delta-sigma modulators characterised by the order of the loop filter, e.g. having a first order loop filter in the feedforward path the modulator having a higher order loop filter in the feedforward path, e.g. with distributed feedforward inputs with distributed feedback, i.e. with feedback paths from the quantiser output to more than one filter stage

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

''PROCESSO E APARELHO PARA MODULAçãO SIGMA-DELTA, E, PROCESSO E APARELHO PARA CONVERSãO DIGITAL/ANALóGICA'' A presente invenção relaciona-se a um aparelho e processo para modulação sigma-delta com um ruído periódico reduzido (ruído ocioso) em um modulador sigma-delta. A redução é obtida por meio da adição de dois sinais Dither diferentes (217, 218) ao modulador sigma-delta. Um primeiro sinal Dither (218) é constituído por uma configuração de bit particular de um certo período, enquanto um segundo sinal Dither (217) é constituído por um sinal pseudo-randómico de um certo outro período.
BR9809163-8A 1997-05-27 1998-05-26 Processo e aparelho para modulação sigma-delta, e, processo e aparelho para conversão digital/ analógica BR9809163A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9701986A SE509408C2 (sv) 1997-05-27 1997-05-27 Anordning och förfarande för reducering av periodiskt brus i en sigma-delta modulator
PCT/SE1998/000990 WO1998054840A2 (en) 1997-05-27 1998-05-26 Apparatus and method for the reduction of periodic noise in a sigma-delta modulator

Publications (1)

Publication Number Publication Date
BR9809163A true BR9809163A (pt) 2000-08-01

Family

ID=20407109

Family Applications (1)

Application Number Title Priority Date Filing Date
BR9809163-8A BR9809163A (pt) 1997-05-27 1998-05-26 Processo e aparelho para modulação sigma-delta, e, processo e aparelho para conversão digital/ analógica

Country Status (12)

Country Link
US (1) US6175321B1 (pt)
EP (1) EP1080534B1 (pt)
JP (1) JP4027434B2 (pt)
KR (1) KR20010013111A (pt)
CN (1) CN1260913A (pt)
AR (1) AR012873A1 (pt)
AU (1) AU751275B2 (pt)
BR (1) BR9809163A (pt)
CO (1) CO4790202A1 (pt)
EE (1) EE03500B1 (pt)
SE (1) SE509408C2 (pt)
WO (1) WO1998054840A2 (pt)

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US6528776B1 (en) 1999-11-19 2003-03-04 New Focus, Inc. Electro optic converter having a passive waveguide and exhibiting impedance mismatch
US6456223B1 (en) * 1999-12-28 2002-09-24 Texas Instruments Incorporated Pipelined analog to digital converter using digital mismatch noise cancellation
US6897772B1 (en) * 2000-11-14 2005-05-24 Honeywell International, Inc. Multi-function control system
JP4649777B2 (ja) * 2001-02-09 2011-03-16 ソニー株式会社 デルタシグマ変調装置及び方法、並びにデジタル信号処理装置及び方法
US6823033B2 (en) 2002-03-12 2004-11-23 Qualcomm Inc. ΣΔdelta modulator controlled phase locked loop with a noise shaped dither
TWI235000B (en) * 2002-09-24 2005-06-21 Mstar Semiconductor Inc Apparatus and method for masking interference noise contained in signal source
US20040141559A1 (en) * 2002-10-24 2004-07-22 Tewfik Ahmed H. Generating UWB-OFDM signal using sigma-delta modulator
DE60328925D1 (de) * 2002-12-24 2009-10-01 Fujitsu Microelectronics Ltd Jittergenerator
US7561635B2 (en) * 2003-08-05 2009-07-14 Stmicroelectronics Nv Variable coder apparatus for resonant power conversion and method
DE602004005437T2 (de) * 2004-07-01 2007-07-19 Ericsson Technology Licensing Ab Vorrichtung mit einem Sigma-Delta-Modulator und Verfahren zur Erzeugung eines quantisierten Signals in einem Sigma-Delta Modulator
US7394418B2 (en) * 2004-07-01 2008-07-01 Telefonaktiebolaget Lm Ericsson (Publ) Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator
US6980145B1 (en) * 2004-07-30 2005-12-27 Broadcom Corporation System and method for noise cancellation in a signal processing circuit
US7362250B2 (en) * 2005-01-31 2008-04-22 Texas Instruments Incorporated Dynamic dither for sigma-delta converters
GB0514677D0 (en) * 2005-07-18 2005-08-24 Queen Mary & Westfield College Sigma delta modulators
WO2007038280A1 (en) * 2005-09-23 2007-04-05 University Of Rochester Blue-noise-modulated sigma-delta analog-to-digital converter
US7215267B1 (en) * 2005-12-19 2007-05-08 Cirrus Logic, Inc. Analog-to-digital converter with dither control
US7538701B2 (en) * 2006-06-08 2009-05-26 Cosmic Circuits Private Limited System and method for improving dynamic performance of a circuit
JP2009088924A (ja) 2007-09-28 2009-04-23 Fujitsu Ltd 信号変調方法、信号変調装置、電子装置および信号変調プログラム
JP4856659B2 (ja) * 2008-01-30 2012-01-18 ルネサスエレクトロニクス株式会社 半導体集積回路装置
KR101182407B1 (ko) 2008-12-22 2012-09-13 한국전자통신연구원 펄스 생성기 및 연속시간 시그마-델타 변조기
US8866655B2 (en) * 2012-08-10 2014-10-21 Infineon Technologies Ag Modulator with variable quantizer
EP3694109B1 (en) * 2014-02-25 2023-05-03 ams AG Microphone arrangement
US11121718B1 (en) * 2020-08-12 2021-09-14 Analog Devices International Unlimited Company Multi-stage sigma-delta analog-to-digital converter with dither

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3999129A (en) * 1975-04-16 1976-12-21 Rolm Corporation Method and apparatus for error reduction in digital information transmission systems
JPS62140518A (ja) * 1985-12-13 1987-06-24 Advantest Corp Ａｄ変換装置
EP0308982B1 (en) 1987-09-25 1995-09-06 Nec Corporation Analog-to-digital converter having an excellent signal-to-noise ratio for small signals
JP2647136B2 (ja) * 1988-05-13 1997-08-27 株式会社東芝 アナログ−デジタル変換回路
JP3012887B2 (ja) * 1989-03-13 2000-02-28 日本テキサス・インスツルメンツ株式会社 信号変換装置
US5055843A (en) * 1990-01-31 1991-10-08 Analog Devices, Inc. Sigma delta modulator with distributed prefiltering and feedback
US5144308A (en) 1991-05-21 1992-09-01 At&T Bell Laboratories Idle channel tone and periodic noise suppression for sigma-delta modulators using high-level dither

Also Published As

Publication number Publication date
WO1998054840A3 (en) 1999-03-11
EP1080534B1 (en) 2006-02-22
US6175321B1 (en) 2001-01-16
WO1998054840A2 (en) 1998-12-03
CO4790202A1 (es) 1999-05-31
EP1080534A2 (en) 2001-03-07
AU751275B2 (en) 2002-08-08
JP2002502565A (ja) 2002-01-22
SE9701986D0 (sv) 1997-05-27
CN1260913A (zh) 2000-07-19
SE509408C2 (sv) 1999-01-25
AU7793898A (en) 1998-12-30
KR20010013111A (ko) 2001-02-26
AR012873A1 (es) 2000-11-22
JP4027434B2 (ja) 2007-12-26
EE9900536A (et) 2000-06-15
EE03500B1 (et) 2001-08-15
SE9701986L (sv) 1998-11-28

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B08G Application fees: restoration [chapter 8.7 patent gazette]
B08F Application fees: application dismissed [chapter 8.6 patent gazette]

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