WO2008143124A1 - 増幅器 - Google Patents

増幅器 Download PDF

Info

Publication number
WO2008143124A1
WO2008143124A1 PCT/JP2008/058919 JP2008058919W WO2008143124A1 WO 2008143124 A1 WO2008143124 A1 WO 2008143124A1 JP 2008058919 W JP2008058919 W JP 2008058919W WO 2008143124 A1 WO2008143124 A1 WO 2008143124A1
Authority
WO
WIPO (PCT)
Prior art keywords
load
electric current
amplifier
generates
detecting signal
Prior art date
Application number
PCT/JP2008/058919
Other languages
English (en)
French (fr)
Inventor
Koji Kawaguchi
Original Assignee
Toa Corporation
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 Toa Corporation filed Critical Toa Corporation
Publication of WO2008143124A1 publication Critical patent/WO2008143124A1/ja

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
    • H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
    • H03G3/301—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers the gain being continuously variable
    • 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
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Control Of Amplification And Gain Control (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

　音源（４）からの音声信号を電圧制御増幅器（２）及びデジタルアンプ（６）で増幅して出力する。デジタルアンプ（６）から負荷に供給される負荷電流を検出し、その大きさを表す負荷電流検出信号を負荷電流検出器（８）が生成する。デジタルアンプ（６）から負荷に供給される負荷電圧を検出し、その大きさを表す電圧検出信号を負荷電圧検出器（１０）が生成する。負荷電流検出信号と負荷電圧検出信号とが減算回路（１８）に供給され、両者の差を表す差信号が生成される。この差信号に応じて電圧制御増幅器（２）のゲインが調整される。
PCT/JP2008/058919 2007-05-21 2008-05-15 増幅器 WO2008143124A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2007134058A JP4960764B2 (ja) 2007-05-21 2007-05-21 増幅器
JP2007-134058 2007-05-21

Publications (1)

Publication Number Publication Date
WO2008143124A1 true WO2008143124A1 (ja) 2008-11-27

Family

ID=40031832

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2008/058919 WO2008143124A1 (ja) 2007-05-21 2008-05-15 増幅器

Country Status (2)

Country Link
JP (1) JP4960764B2 (ja)
WO (1) WO2008143124A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011109642A (ja) * 2009-10-23 2011-06-02 Rohm Co Ltd 初段増幅回路およびそれを用いた電子機器
GB2498602A (en) * 2011-09-29 2013-07-24 D & B Autotechnik Gmbh Audio amplifier with output limiting circuit, suitable for use with a regulated power supply
CN113589039A (zh) * 2020-04-30 2021-11-02 株式会社村田制作所 负载检测电路及放大电路

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101157993B1 (ko) 2011-12-22 2012-06-25 제이디미디어 주식회사 출력제어기능을 갖는 디지털 앰프
WO2015119956A2 (en) 2014-02-04 2015-08-13 Cirrus Logic, Inc. Switched mode amplifier
GB2544200B (en) 2014-05-08 2021-10-06 Cirrus Logic Inc Switched mode amplifier with single-ended buck mode
US9628033B2 (en) 2014-10-29 2017-04-18 Cirrus Logic, Inc. Power stage with switched mode amplifier and linear amplifier

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06188660A (ja) * 1992-12-16 1994-07-08 Nec Eng Ltd 電力増幅回路
JP2004215078A (ja) * 2003-01-07 2004-07-29 Roland Corp Ｄ級電力増幅装置
JP2007074431A (ja) * 2005-09-07 2007-03-22 Flying Mole Corp 保護回路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06188660A (ja) * 1992-12-16 1994-07-08 Nec Eng Ltd 電力増幅回路
JP2004215078A (ja) * 2003-01-07 2004-07-29 Roland Corp Ｄ級電力増幅装置
JP2007074431A (ja) * 2005-09-07 2007-03-22 Flying Mole Corp 保護回路

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011109642A (ja) * 2009-10-23 2011-06-02 Rohm Co Ltd 初段増幅回路およびそれを用いた電子機器
GB2498602A (en) * 2011-09-29 2013-07-24 D & B Autotechnik Gmbh Audio amplifier with output limiting circuit, suitable for use with a regulated power supply
GB2498602B (en) * 2011-09-29 2014-06-11 D & B Autotechnik Gmbh Audio amplifier
US9071212B2 (en) 2011-09-29 2015-06-30 D&B Audiotechnik Gmbh Audio amplifier
CN113589039A (zh) * 2020-04-30 2021-11-02 株式会社村田制作所 负载检测电路及放大电路

Also Published As

Publication number Publication date
JP4960764B2 (ja) 2012-06-27
JP2008289047A (ja) 2008-11-27

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