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WO2008100055A3 - Microphone amplifier - Google Patents

Microphone amplifier Download PDF

Info

Publication number
WO2008100055A3
WO2008100055A3 PCT/KR2008/000817 KR2008000817W WO2008100055A3 WO 2008100055 A3 WO2008100055 A3 WO 2008100055A3 KR 2008000817 W KR2008000817 W KR 2008000817W WO 2008100055 A3 WO2008100055 A3 WO 2008100055A3
Authority
WO
WIPO (PCT)
Prior art keywords
current
voltage
low
conversion unit
microphone amplifier
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.)
Ceased
Application number
PCT/KR2008/000817
Other languages
French (fr)
Other versions
WO2008100055A2 (en
Inventor
Jin Hyo Lee
Kyu Hong Lee
Hee Cheon Shin
Hun Ill Youn
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.)
RFSEMI TECHNOLOGIES Inc
Original Assignee
RFSEMI TECHNOLOGIES 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
Application filed by RFSEMI TECHNOLOGIES Inc filed Critical RFSEMI TECHNOLOGIES Inc
Priority to CN200880005324.7A priority Critical patent/CN101675669B/en
Publication of WO2008100055A2 publication Critical patent/WO2008100055A2/en
Publication of WO2008100055A3 publication Critical patent/WO2008100055A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/005—Electrostatic transducers using semiconductor materials
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Power Engineering (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The present invention relates to a microphone amplifier, including a bias unit for providing an input signal reference potential between a signal input terminal and a ground terminal, a voltage-to-current conversion unit for amplifying the input signal, a constant current source for supplying constant current to the voltage-to-current conversion unit, and a current amplification unit for amplifying variation in current between the constant current source and the voltage-to-current conversion unit. The above-described present invention provides a highly trustworthy microphone amplifier, in which a low-noise characteristic junction field effect transistor and a low- noise characteristic bipolar transistor are combined together, thereby realizing high input impedance, high amplification gain and low current consumption.
PCT/KR2008/000817 2007-02-16 2008-02-12 Microphone amplifier Ceased WO2008100055A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200880005324.7A CN101675669B (en) 2007-02-16 2008-02-12 Microphone amplifier

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0016271 2007-02-16
KR1020070016271A KR100733288B1 (en) 2007-02-16 2007-02-16 Microphone amplifier

Publications (2)

Publication Number Publication Date
WO2008100055A2 WO2008100055A2 (en) 2008-08-21
WO2008100055A3 true WO2008100055A3 (en) 2008-10-16

Family

ID=38373699

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2008/000817 Ceased WO2008100055A2 (en) 2007-02-16 2008-02-12 Microphone amplifier

Country Status (3)

Country Link
KR (1) KR100733288B1 (en)
CN (1) CN101675669B (en)
WO (1) WO2008100055A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101183986B1 (en) 2008-12-19 2012-09-19 한국전자통신연구원 A read-out circuit with high impedance
CA2788409C (en) * 2010-02-05 2017-10-10 Research Electronics Leksand Ab Method and arrangement for driving a microphone
KR101109392B1 (en) 2010-07-20 2012-01-30 주식회사 케이이씨 Microphone amplifier
DE102010054897B4 (en) * 2010-12-17 2012-12-20 Austriamicrosystems Ag Amplifier circuit for a two-wire interface, microphone amplifier and circuit arrangement for converting a speech signal
CN103067819B (en) * 2011-10-18 2015-09-30 歌尔声学股份有限公司 microphone amplifying circuit
GB2525674B (en) * 2014-05-02 2017-11-29 Cirrus Logic Int Semiconductor Ltd Low noise amplifier for MEMS capacitive transducers
KR101601229B1 (en) * 2014-11-17 2016-03-08 현대자동차주식회사 Micro phone sensor
CN111917385B (en) * 2019-05-08 2024-12-20 立积电子股份有限公司 Amplifier device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214215A (en) * 1978-08-02 1980-07-22 Contact Communication Corporation Low noise-high gain JFET amplifier for a piezoelectric transducer
US6160450A (en) * 1999-04-09 2000-12-12 National Semiconductor Corporation Self-biased, phantom-powered and feedback-stabilized amplifier for electret microphone
US6504937B1 (en) * 1998-01-06 2003-01-07 Vxi Corporation Amplifier circuit for electret microphone with enhanced performance
US6888408B2 (en) * 2002-08-27 2005-05-03 Sonion Tech A/S Preamplifier for two terminal electret condenser microphones
KR20060113925A (en) * 2003-10-14 2006-11-03 아우디오아시스 에이/에스 Microphone preamplifier

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005209842A (en) * 2004-01-22 2005-08-04 Fuji Electric Holdings Co Ltd Method and apparatus for forming electromagnetic coil
KR20050102180A (en) * 2004-04-21 2005-10-26 박용석 A changeable gain and low noise amplifier for an audio storage system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214215A (en) * 1978-08-02 1980-07-22 Contact Communication Corporation Low noise-high gain JFET amplifier for a piezoelectric transducer
US6504937B1 (en) * 1998-01-06 2003-01-07 Vxi Corporation Amplifier circuit for electret microphone with enhanced performance
US6160450A (en) * 1999-04-09 2000-12-12 National Semiconductor Corporation Self-biased, phantom-powered and feedback-stabilized amplifier for electret microphone
US6888408B2 (en) * 2002-08-27 2005-05-03 Sonion Tech A/S Preamplifier for two terminal electret condenser microphones
KR20060113925A (en) * 2003-10-14 2006-11-03 아우디오아시스 에이/에스 Microphone preamplifier

Also Published As

Publication number Publication date
WO2008100055A2 (en) 2008-08-21
CN101675669A (en) 2010-03-17
KR100733288B1 (en) 2007-06-28
CN101675669B (en) 2013-11-06

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