WO2008024666A3 - Method and apparatus for controlling a selectable voltage audio power output stage - Google Patents

Method and apparatus for controlling a selectable voltage audio power output stage Download PDF

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Publication number
WO2008024666A3
WO2008024666A3 PCT/US2007/076069 US2007076069W WO2008024666A3 WO 2008024666 A3 WO2008024666 A3 WO 2008024666A3 US 2007076069 W US2007076069 W US 2007076069W WO 2008024666 A3 WO2008024666 A3 WO 2008024666A3
Authority
WO
WIPO (PCT)
Prior art keywords
power supply
arrival
voltage
controlling
signal
Prior art date
Application number
PCT/US2007/076069
Other languages
French (fr)
Other versions
WO2008024666A2 (en
Inventor
John L Melanson
John Christopher Tucker
Original Assignee
Cirrus Logic Inc
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
Priority claimed from US11/610,496 external-priority patent/US8311243B2/en
Priority claimed from US11/611,069 external-priority patent/US8068622B2/en
Application filed by Cirrus Logic Inc filed Critical Cirrus Logic Inc
Publication of WO2008024666A2 publication Critical patent/WO2008024666A2/en
Publication of WO2008024666A3 publication Critical patent/WO2008024666A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
    • H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
    • H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
    • H03F1/0244—Stepped control
    • H03F1/025—Stepped control by using a signal derived from the input signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/507—A switch being used for switching on or off a supply or supplying circuit in an IC-block amplifier circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/511—Many discrete supply voltages or currents or voltage levels can be chosen by a control signal in an IC-block amplifier circuit

Abstract

A method and apparatus for controlling a selectable voltage audio power output stage provides a mechanism for raising the selected power amplifier output voltage in time for the arrival of signal peaks to avoid clipping. Signal peaks may either be delayed by delaying an increase in volume control level or enabling signal compression for a predetermined time period, so that sufficient time is provided for the amplifier power supply to stabilize at a higher operating voltage when an increase of power supply voltage is selected. Alternatively, a signal level may be determined at an upstream source, such as a decoder or filter that provides information in sufficient advance of the arrival of the peaks, and used to control the power supply selection, so that the higher power supply voltage level is selected in advance of arrival of the signal peaks that would otherwise cause clipping at the power amplifier output.
PCT/US2007/076069 2006-08-21 2007-08-16 Method and apparatus for controlling a selectable voltage audio power output stage WO2008024666A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US82303606P 2006-08-21 2006-08-21
US60/823,036 2006-08-21
US11/610,496 2006-12-13
US11/610,496 US8311243B2 (en) 2006-08-21 2006-12-13 Energy-efficient consumer device audio power output stage
US11/611,069 2006-12-14
US11/611,069 US8068622B2 (en) 2006-12-13 2006-12-14 Method and apparatus for controlling a selectable voltage audio power output stage

Publications (2)

Publication Number Publication Date
WO2008024666A2 WO2008024666A2 (en) 2008-02-28
WO2008024666A3 true WO2008024666A3 (en) 2008-05-29

Family

ID=39107541

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/076069 WO2008024666A2 (en) 2006-08-21 2007-08-16 Method and apparatus for controlling a selectable voltage audio power output stage

Country Status (1)

Country Link
WO (1) WO2008024666A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9425747B2 (en) 2008-03-03 2016-08-23 Qualcomm Incorporated System and method of reducing power consumption for audio playback
US8995691B2 (en) 2008-07-14 2015-03-31 Audera Acoustics Inc. Audio amplifier
JP5635507B2 (en) * 2010-01-07 2014-12-03 パナソニック株式会社 Amplifier
US8717211B2 (en) 2010-11-30 2014-05-06 Qualcomm Incorporated Adaptive gain adjustment system
US9184705B2 (en) 2013-03-15 2015-11-10 Bose Corporation Feedback mechanism for boost-on-demand amplifiers
US9154095B2 (en) 2013-03-15 2015-10-06 Bose Corporation Boost-on-demand amplifier

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279694A2 (en) * 1987-02-20 1988-08-24 Victor Company Of Japan, Limited Audio amplifier
DE19858963A1 (en) * 1998-12-21 2000-07-13 Becker Gmbh Audio signal amplifier e.g. for automobile, uses analysis device for signal to be amplified coupled to control device for controlled voltage supply for amplifier
GB2360410A (en) * 2000-03-18 2001-09-19 Univ Bristol An amplifier in which the input signal is delayed to allow time for the power supply to adjust to a level which minimises power loss
DE10140285A1 (en) * 2001-08-16 2003-02-27 Klein & Hummel Gmbh Audio signal amplifier circuit compares delayed and non-delayed audio signal levels with voltage across power amplifier
EP1317105A1 (en) * 2001-11-30 2003-06-04 Texas Instruments Incorporated Line driver using a class G amplifier and a programmable peak detector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0279694A2 (en) * 1987-02-20 1988-08-24 Victor Company Of Japan, Limited Audio amplifier
DE19858963A1 (en) * 1998-12-21 2000-07-13 Becker Gmbh Audio signal amplifier e.g. for automobile, uses analysis device for signal to be amplified coupled to control device for controlled voltage supply for amplifier
GB2360410A (en) * 2000-03-18 2001-09-19 Univ Bristol An amplifier in which the input signal is delayed to allow time for the power supply to adjust to a level which minimises power loss
DE10140285A1 (en) * 2001-08-16 2003-02-27 Klein & Hummel Gmbh Audio signal amplifier circuit compares delayed and non-delayed audio signal levels with voltage across power amplifier
EP1317105A1 (en) * 2001-11-30 2003-06-04 Texas Instruments Incorporated Line driver using a class G amplifier and a programmable peak detector

Also Published As

Publication number Publication date
WO2008024666A2 (en) 2008-02-28

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