WO2008100055A3 - Microphone amplifier - Google Patents
Microphone amplifier Download PDFInfo
- 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
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
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.
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 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101183986B1 (en) | 2008-12-19 | 2012-09-19 | 한국전자통신연구원 | A read-out circuit with high impedance |
US9257944B2 (en) | 2010-02-05 | 2016-02-09 | Research Electronics Leksand Ab | Method and arrangement for driving a microphone |
KR101109392B1 (en) | 2010-07-20 | 2012-01-30 | 주식회사 케이이씨 | Amplifier for microphone |
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 |
TWI724893B (en) * | 2019-05-08 | 2021-04-11 | 立積電子股份有限公司 | Amplifier device |
Citations (5)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005209842A (en) * | 2004-01-22 | 2005-08-04 | Fuji Electric Holdings Co Ltd | Shaping method and device of electromagnetic coil |
KR20050102180A (en) * | 2004-04-21 | 2005-10-26 | 박용석 | A changeable gain and low noise amplifier for an audio storage system |
-
2007
- 2007-02-16 KR KR1020070016271A patent/KR100733288B1/en active IP Right Grant
-
2008
- 2008-02-12 CN CN200880005324.7A patent/CN101675669B/en not_active Expired - Fee Related
- 2008-02-12 WO PCT/KR2008/000817 patent/WO2008100055A2/en active Application Filing
Patent Citations (5)
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 |
---|---|
CN101675669B (en) | 2013-11-06 |
WO2008100055A2 (en) | 2008-08-21 |
CN101675669A (en) | 2010-03-17 |
KR100733288B1 (en) | 2007-06-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2008100055A3 (en) | Microphone amplifier | |
WO2014116687A3 (en) | Amplifiers with improved isolation | |
GB2451524B (en) | Amplifier circuit | |
MX2017005869A (en) | Power amplifier for amplifying radio frequency signal. | |
WO2015176077A3 (en) | Systems and methods related to linear and efficient broadband power amplifiers | |
TW200719584A (en) | High-bandwidth high-gain amplifier | |
TW200719585A (en) | High-bandwidth high-gain amplifier | |
ATE523957T1 (en) | LOW NOISE TRANSCONDUCTANCE AMPLIFIER WITH SQUARE OUTPUT AND DIFFERENTIAL INPUT | |
TW200616326A (en) | Low noise and high gain low noise amplifier | |
TW200644413A (en) | System-in-package wireless communication device | |
MX2013006660A (en) | Low noise amplifier. | |
TW200633365A (en) | Audio frequency signal amplifier and electrical machine using the same | |
TW200616351A (en) | Low-noise amplifier using cascade topology to realize single terminal input to differential-pair output | |
TW200629718A (en) | Current limit circuit for power amplifiers | |
WO2005018041A3 (en) | Low noise, electric field sensor | |
GB2442924A (en) | A method and apparatus for increasing the efficiency of low power amplifiers | |
EP2706661A3 (en) | Low-quiescent current headset driver | |
TW200635208A (en) | Low noise amplifier | |
WO2014209483A8 (en) | Loss-less frequency dependent dicke-switched radiometer | |
TW200627791A (en) | Power amplifier circuit and method thereof | |
TW200707897A (en) | Amplifier circuit having a compensating amplifier unit for improving loop gain and linearity | |
WO2006112957A3 (en) | Amplifying a signal using a current shared power amplifier | |
DE602005011605D1 (en) | PLUG NOISE AVOIDANCE FOR AN AMPLIFIER | |
WO2007140392A3 (en) | Methods and apparatus to provide slew enhancement for low power amplifiers | |
TW200713804A (en) | Differential amplifier |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200880005324.7 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 08712464 Country of ref document: EP Kind code of ref document: A2 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 08712464 Country of ref document: EP Kind code of ref document: A2 |