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GB2491913B - Amplifier circuit - Google Patents

Amplifier circuit

Info

Publication number
GB2491913B
GB2491913B GB1119503.9A GB201119503A GB2491913B GB 2491913 B GB2491913 B GB 2491913B GB 201119503 A GB201119503 A GB 201119503A GB 2491913 B GB2491913 B GB 2491913B
Authority
GB
United Kingdom
Prior art keywords
zero
level
states
output
zero state
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.)
Active
Application number
GB1119503.9A
Other versions
GB2491913A (en
GB201119503D0 (en
Inventor
John Paul Lesso
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 GB1119503.9A priority Critical patent/GB2491913B/en
Publication of GB201119503D0 publication Critical patent/GB201119503D0/en
Publication of GB2491913A publication Critical patent/GB2491913A/en
Application granted granted Critical
Publication of GB2491913B publication Critical patent/GB2491913B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The H-bridge output stage 406 of a class-D amplifier provides two zero output states: a first zero state in which both load terminals are coupled to Earth, and a second zero state in which both load terminals are coupled to the supply rail. The first zero state is used when the signal level is low because the Earth rail is typically less noisy than the supply rail, but when the signal level is high the first and second zero outputs are selected equally often so that the common-mode output voltage is equal to half the supply voltage, which enables a larger output voltage swing. The circuit 404 maps a variable proportion â alphaâ of the 00 states output from the tri-level quantiser 403 into 11 states under control of the circuit 407 which responds to the level of the amplifier input signal.
GB1119503.9A 2011-11-11 2011-11-11 Amplifier circuit Active GB2491913B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1119503.9A GB2491913B (en) 2011-11-11 2011-11-11 Amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1119503.9A GB2491913B (en) 2011-11-11 2011-11-11 Amplifier circuit

Publications (3)

Publication Number Publication Date
GB201119503D0 GB201119503D0 (en) 2011-12-21
GB2491913A GB2491913A (en) 2012-12-19
GB2491913B true GB2491913B (en) 2013-11-06

Family

ID=45421642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1119503.9A Active GB2491913B (en) 2011-11-11 2011-11-11 Amplifier circuit

Country Status (1)

Country Link
GB (1) GB2491913B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6472933B2 (en) * 1999-09-27 2002-10-29 Waytech Investment Co., Ltd. Switching amplifier incorporating return-to-zero quaternary power switch
US6867722B2 (en) * 2003-02-13 2005-03-15 Texas Instruments Incorporated H-bridge common-mode noise reduction circuit
US7969242B2 (en) * 2008-07-24 2011-06-28 Qualcomm Incorporated Switching power amplifier for quantized signals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6472933B2 (en) * 1999-09-27 2002-10-29 Waytech Investment Co., Ltd. Switching amplifier incorporating return-to-zero quaternary power switch
US6867722B2 (en) * 2003-02-13 2005-03-15 Texas Instruments Incorporated H-bridge common-mode noise reduction circuit
US7969242B2 (en) * 2008-07-24 2011-06-28 Qualcomm Incorporated Switching power amplifier for quantized signals

Also Published As

Publication number Publication date
GB2491913A (en) 2012-12-19
GB201119503D0 (en) 2011-12-21

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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