GB2438774B - Class D amplifier - Google Patents

Class D amplifier

Info

Publication number
GB2438774B
GB2438774B GB0716762A GB0716762A GB2438774B GB 2438774 B GB2438774 B GB 2438774B GB 0716762 A GB0716762 A GB 0716762A GB 0716762 A GB0716762 A GB 0716762A GB 2438774 B GB2438774 B GB 2438774B
Authority
GB
United Kingdom
Prior art keywords
amplifier
class
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
GB0716762A
Other versions
GB2438774A (en
GB0716762D0 (en
Inventor
Anthony James Magrath
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cirrus Logic International UK Ltd
Original Assignee
Wolfson Microelectronics PLC
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 Wolfson Microelectronics PLC filed Critical Wolfson Microelectronics PLC
Priority to GB0716762A priority Critical patent/GB2438774B/en
Priority claimed from GB0321589A external-priority patent/GB2406008B/en
Publication of GB0716762D0 publication Critical patent/GB0716762D0/en
Publication of GB2438774A publication Critical patent/GB2438774A/en
Application granted granted Critical
Publication of GB2438774B publication Critical patent/GB2438774B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • H03F3/2175—Class D power amplifiers; Switching amplifiers using analogue-digital or digital-analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/217—Class D power amplifiers; Switching amplifiers
    • 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)
  • Power Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
GB0716762A 2003-09-15 2003-09-15 Class D amplifier Expired - Lifetime GB2438774B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0716762A GB2438774B (en) 2003-09-15 2003-09-15 Class D amplifier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0716762A GB2438774B (en) 2003-09-15 2003-09-15 Class D amplifier
GB0321589A GB2406008B (en) 2003-09-15 2003-09-15 Class D amplifier

Publications (3)

Publication Number Publication Date
GB0716762D0 GB0716762D0 (en) 2007-10-10
GB2438774A GB2438774A (en) 2007-12-05
GB2438774B true GB2438774B (en) 2008-04-16

Family

ID=38616903

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0716762A Expired - Lifetime GB2438774B (en) 2003-09-15 2003-09-15 Class D amplifier

Country Status (1)

Country Link
GB (1) GB2438774B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107947800A (en) * 2017-11-08 2018-04-20 中国电子科技集团公司电子科学研究院 A kind of low time delay ring detection method of binary system LDPC code

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011121139B4 (en) 2011-12-15 2016-11-24 IAD Gesellschaft für Informatik, Automatisierung und Datenverarbeitung mbH Device having a delta-sigma modulator and a MOSFET output stage connected thereto
US8717096B2 (en) * 2012-02-17 2014-05-06 NeoEnergy Microelectronics, Inc. Switching amplifier system and method for suppressing signal distortion thereof

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6255977B1 (en) * 1998-11-24 2001-07-03 Robert Bosch Gmbh Sigma-delta-d/a-converter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6255977B1 (en) * 1998-11-24 2001-07-03 Robert Bosch Gmbh Sigma-delta-d/a-converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107947800A (en) * 2017-11-08 2018-04-20 中国电子科技集团公司电子科学研究院 A kind of low time delay ring detection method of binary system LDPC code
CN107947800B (en) * 2017-11-08 2021-07-16 中国电子科技集团公司电子科学研究院 Low-delay loop detection method of binary LDPC code

Also Published As

Publication number Publication date
GB2438774A (en) 2007-12-05
GB0716762D0 (en) 2007-10-10

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)

Free format text: REGISTERED BETWEEN 20150820 AND 20150826

PE20 Patent expired after termination of 20 years

Expiry date: 20230914