WO2002015388A3 - Amplifier circuits and methods to provide smooth transition of amplifier outputs during powering sequences - Google Patents

Amplifier circuits and methods to provide smooth transition of amplifier outputs during powering sequences Download PDF

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Publication number
WO2002015388A3
WO2002015388A3 PCT/US2001/041681 US0141681W WO0215388A3 WO 2002015388 A3 WO2002015388 A3 WO 2002015388A3 US 0141681 W US0141681 W US 0141681W WO 0215388 A3 WO0215388 A3 WO 0215388A3
Authority
WO
WIPO (PCT)
Prior art keywords
power
amplifier
smooth transition
provide smooth
during
Prior art date
Application number
PCT/US2001/041681
Other languages
French (fr)
Other versions
WO2002015388A2 (en
Inventor
Christopher F Edwards
J William Maney Jr
Original Assignee
Maxim Integrated Products
Christopher F Edwards
J William Maney Jr
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 Maxim Integrated Products, Christopher F Edwards, J William Maney Jr filed Critical Maxim Integrated Products
Publication of WO2002015388A2 publication Critical patent/WO2002015388A2/en
Publication of WO2002015388A3 publication Critical patent/WO2002015388A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/348—Muting in response to a mechanical action or to power supply variations, e.g. during tuning; Click removal circuits
    • 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
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/305—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in case of switching on or off of a power supply
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/72—Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
    • H03F2203/72—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal
    • H03F2203/7212—Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal the gated amplifier being switched on or off by switching off or on a feedback control loop of the amplifier

Landscapes

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

Abstract

The present invention is an apparatus and method to control an output from an amplifier circuit during a powering sequence. A current control circuit is coupled to the amplifier circuit to provide smooth transition at the output during the powering sequence, including the power-up interval and the power-down interval, during which the amplifier is muted. This results in the establishment and the decay of the amplifier mid-supply bias point during the power-up and power-down sequences, respectively, at rates that do not have significant frequency components in the audible range, eliminating the static-like click or pop on power-up and power-down, yet still providing short power-up and power-down times.
PCT/US2001/041681 2000-08-11 2001-08-10 Amplifier circuits and methods to provide smooth transition of amplifier outputs during powering sequences WO2002015388A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63780100A 2000-08-11 2000-08-11
US09/637,801 2000-08-11

Publications (2)

Publication Number Publication Date
WO2002015388A2 WO2002015388A2 (en) 2002-02-21
WO2002015388A3 true WO2002015388A3 (en) 2003-08-21

Family

ID=24557420

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/041681 WO2002015388A2 (en) 2000-08-11 2001-08-10 Amplifier circuits and methods to provide smooth transition of amplifier outputs during powering sequences

Country Status (1)

Country Link
WO (1) WO2002015388A2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2866763B1 (en) 2004-02-19 2006-05-26 St Microelectronics Sa AUDIO AMPLIFICATION DEVICE WITH ANTIPOP CIRCUITRY
EP1689075B1 (en) * 2005-02-03 2018-07-11 Texas Instruments Inc. Multi-stage amplifier to reduce pop noise
EP1689076B1 (en) * 2005-02-03 2019-08-07 Texas Instruments Inc. Track and hold circuit to reduce pop noise
US8179192B2 (en) 2007-03-07 2012-05-15 Nxp B.V. Signal processor comprising a reference voltage circuit
FR2945167A1 (en) * 2009-04-30 2010-11-05 Dolphin Integration Sa Audio device output stage standbying method, involves reducing polarization current of output stage to low consumption operating point so that output of output stage remains at continuous voltage near to common mode voltage
FR3025373B1 (en) 2014-08-26 2018-06-08 Dolphin Integration Sa REDUCTION NOISE REDUCTION CIRCUIT

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661808A (en) * 1979-10-24 1981-05-27 Sanyo Electric Co Ltd Shock noise preventing circuit
US4638507A (en) * 1984-04-20 1987-01-20 Sgs-Ates Componenti Elettronici S.P.A. Audio amplifier switch-on control circuit
EP0299665A2 (en) * 1987-07-13 1989-01-18 Kabushiki Kaisha Toshiba Power amplifier circuit with a stand-by state
EP0490295A1 (en) * 1990-12-11 1992-06-17 STMicroelectronics S.r.l. Circuit for suppressing the noise produced by the switching of two voltage sources, particularly for audio preamplification stages
EP0570655A1 (en) * 1992-05-22 1993-11-24 STMicroelectronics S.r.l. Audio amplifier on-off control circuit
US5307025A (en) * 1992-07-14 1994-04-26 Media Vision, Inc. Audio power amplifier with noise prevention at turn-on and turn-off
US5515431A (en) * 1993-09-02 1996-05-07 Temic Telefunken Microelectronic Gmbh Speakerphone device with auxiliary circuit for eliminating clicking at power-on
US5648742A (en) * 1995-10-23 1997-07-15 National Semiconductor Corporation Amplifier circuit with reduced turn-on and turn-off transients

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5661808A (en) * 1979-10-24 1981-05-27 Sanyo Electric Co Ltd Shock noise preventing circuit
US4638507A (en) * 1984-04-20 1987-01-20 Sgs-Ates Componenti Elettronici S.P.A. Audio amplifier switch-on control circuit
EP0299665A2 (en) * 1987-07-13 1989-01-18 Kabushiki Kaisha Toshiba Power amplifier circuit with a stand-by state
EP0490295A1 (en) * 1990-12-11 1992-06-17 STMicroelectronics S.r.l. Circuit for suppressing the noise produced by the switching of two voltage sources, particularly for audio preamplification stages
EP0570655A1 (en) * 1992-05-22 1993-11-24 STMicroelectronics S.r.l. Audio amplifier on-off control circuit
US5307025A (en) * 1992-07-14 1994-04-26 Media Vision, Inc. Audio power amplifier with noise prevention at turn-on and turn-off
US5515431A (en) * 1993-09-02 1996-05-07 Temic Telefunken Microelectronic Gmbh Speakerphone device with auxiliary circuit for eliminating clicking at power-on
US5648742A (en) * 1995-10-23 1997-07-15 National Semiconductor Corporation Amplifier circuit with reduced turn-on and turn-off transients

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 005, no. 125 (E - 069) 12 August 1981 (1981-08-12) *

Also Published As

Publication number Publication date
WO2002015388A2 (en) 2002-02-21

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