CN201774652U - Microphone of mobile terminal, mobile terminal employing same - Google Patents
Microphone of mobile terminal, mobile terminal employing same Download PDFInfo
- Publication number
- CN201774652U CN201774652U CN2010202790134U CN201020279013U CN201774652U CN 201774652 U CN201774652 U CN 201774652U CN 2010202790134 U CN2010202790134 U CN 2010202790134U CN 201020279013 U CN201020279013 U CN 201020279013U CN 201774652 U CN201774652 U CN 201774652U
- Authority
- CN
- China
- Prior art keywords
- microphone
- portable terminal
- field effect
- effect transistor
- mobile terminal
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Telephone Set Structure (AREA)
Abstract
The utility model discloses a microphone of a mobile terminal, and the mobile terminal employing the microphone. The microphone is arranged on the mobile terminal and includes a metal casing, wherein a field-effect tube is arranged in the metal casing; a grid electrode of the field effect tube is grounded through an ECM module, a drain electrode of the field effect tube is connected with an output terminal of the microphone through a first capacitor, and a source electrode of the field effect tube is grounded; and the metal casing is connected with a grounding terminal of a mainboard of the mobile terminal. The microphone, and the mobile terminal employing the microphone, which are provided by the utility model, have the advantages as follows: as the metal casing of the microphone is connected to the mainboard of the mobile terminal and grounded, the ground of the metal casing is not communicated with the ground of a microphone circuit, and better shielding effect is achieved; and meanwhile, a filtering capacitor inside the microphone is replaced by a lowpass filtering circuit, high-frequency clutter can be completely filtered, and the antistatic effect and the RFI (radio-frequency interference) resistance effect of the microphone are further improved.
Description
Technical field
The utility model relates to communication technical field, particularly a kind of microphone of portable terminal and portable terminal thereof.
Background technology
At present, mobile phone uses mono pole antenna (single-polarized antenna) more and more general, and generally mono pole antenna and microphone all are arranged on mobile phone bottom, microphone is easy to be subjected to the radio frequency noise interference of aerial radiation like this, and this interference is commonly called as current sound.
See also Fig. 1, traditional microphone comprises a metal shell 100, in metal shell 100, be provided with field effect transistor Q, the grid G of field effect transistor Q is by an EMC module (Electro magneticCompatibility, Electro Magnetic Compatibility) ground connection, drain D connects its output port by a capacitor C, the direct ground connection of the source S of field effect transistor Q.Metal shell 100 is connected ground connection by a lead (not marking among the figure) with the common ground port of field effect transistor Q.And, between the drain D of field effect transistor Q and ground, be provided with a plurality of filter capacitor C0 in the inside of microphone.
Because the metal shell 100 of microphone and the ground of microphone circuit link together, the static of mobile phone and the radio frequency interference of antenna are easy to be received by metal shell 100, are coupled on the holding wire by shared ground then.If the perforate of microphone directly outwardly, the inner and mobile phone inside of microphone is easy to by in the static shock and damage.And traditional microphone all is to adopt simple filter capacitor filtering clutter, and its filter effect is unsatisfactory.
Thereby prior art is still waiting to improve and improve.
The utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of microphone and portable terminal thereof of portable terminal, the static that shielding is moved and the radio frequency interference of antenna.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of microphone of portable terminal, described microphone is arranged on the portable terminal, it comprises a metal shell, wherein, in described metal shell, be provided with field effect transistor, the grid of described field effect transistor is by ECM module ground connection, and the drain electrode of field effect transistor is by the output port of first electric capacity connection microphone, the source ground of field effect transistor; Described metal shell is connected with the grounding ports of portable terminal mainboard.
The microphone of described portable terminal wherein, is provided with filter circuit between the drain electrode of field effect transistor and first electric capacity.
The microphone of described portable terminal, wherein, described filter circuit is a low-pass filter circuit.
The microphone of described portable terminal, wherein, described filter circuit adopts the circuit structure of resistance and electric capacity parallel connection.
The microphone of described portable terminal, wherein, described field effect transistor is a N channel field-effect pipe.
A kind of portable terminal, wherein, described portable terminal is provided with microphone, described microphone comprises a metal shell, in described metal shell, be provided with field effect transistor, the grid of described field effect transistor is by ECM module ground connection, and the drain electrode of field effect transistor is by the output port of first electric capacity connection microphone, the source ground of field effect transistor; Described metal shell is connected with the grounding ports of portable terminal mainboard.
Described portable terminal wherein, is provided with filter circuit between the drain electrode of field effect transistor and first electric capacity.
Described portable terminal, wherein, described filter circuit is a low-pass filter circuit.
Described portable terminal, wherein, described filter circuit adopts the circuit structure of resistance and electric capacity parallel connection.
Described portable terminal, wherein, described portable terminal is a mobile phone.
The microphone of the portable terminal that the utility model that the utility model provides provides and portable terminal thereof, owing to adopted metal shell to be connected to ground connection on the portable terminal mainboard with microphone, the ground that makes metal shell not with the ground conducting of microphone circuit, played good shield effectiveness, and the filter capacitor that will have microphone inside now makes low-pass filter circuit into, filtering all high frequency clutters, further improved the effect of the antistatic and anti-radio frequency interference of microphone.
Description of drawings
Fig. 1 is the electrical block diagram of prior art microphone;
Fig. 2 is the circuit theory diagrams of the utility model microphone;
Fig. 3 is the electrical block diagram of the utility model microphone.
Embodiment
The utility model provides a kind of microphone and portable terminal thereof of portable terminal, and is clearer, clear and definite for making the purpose of this utility model, technical scheme and effect, below with reference to accompanying drawing and give an actual example the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Microphone of the present utility model is arranged on portable terminal bottom, and this microphone has the effect of antistatic and anti-radio frequency interference.
See also Fig. 2, described microphone comprises a metal shell 110, is provided with a field effect transistor (FET) Q1 in this metal shell 110, and this field effect transistor Q1 mainly plays amplification, and described field effect transistor adopts N channel field-effect pipe.
The grid G of described field effect transistor Q1 is by ECM module 111 ground connection, and this ECM module 111 is mainly used in the electromagnetic interference that is used for the microphone input; The drain D of field effect transistor Q1 connects the output port of microphone by first capacitor C 1, and this drain D also is connected with power supply Vs by first resistance R 1, and Vs provides supply voltage to microphone by power supply; The source S ground connection of field effect transistor Q1.So the signal of whole microphone is by the drain electrode output of field effect transistor Q1.
Wherein, described metal shell 110 is connected with grounding ports (not marking among the figure) on the described portable terminal mainboard 120.
In the present embodiment, the grid G of described field effect transistor Q1 and source S shared identical ground on the circuit of microphone.Metal shell 110 and portable terminal mainboard 120 shared identical ground, thus the ground of metal shell 110 is not connected with the ground of microphone circuit, and metal shell not only can not introduced interference like this, and can play good shield effectiveness.
See also Fig. 3, between the drain D of field effect transistor Q1 and first capacitor C 1, be provided with a filter circuit 112, be used for the signal in the microphone is carried out Filtering Processing.This filter circuit 112 is a low-pass filter circuit, and described low-pass filter circuit only allows the signal of low band frequency to pass through, and all high frequency clutters of energy filtering further play the effect of antistatic and anti-antenna radio frequency interference.
This practicality is executed in the example, and described low-pass filter circuit adopts the circuit structure of resistance and electric capacity parallel connection, and promptly described low-pass filter circuit comprises second resistance R 2 and the second electric capacity R3.
Wherein, described second resistance R 2 is connected between the drain D and first capacitor C 1 of field effect transistor Q1, and an end of second capacitor C 2 is connected with the output of second resistance R 2, and the other end is connected with the ground of microphone circuit.
Should be noted that microphone structure of the present utility model is adapted to all microphones, for example, electret microphone and MEMS (Microelectromechanical Systems, MEMS (micro electro mechanical system)) microphone etc.
Based on the microphone of above-mentioned portable terminal, the utility model embodiment also provides a kind of portable terminal, and this portable terminal is a mobile phone.Described terminal be provided with mono pole antenna and microphone bottom, in view of this microphone in above existing detailed description, repeat no more herein.
In sum, the microphone of the portable terminal that the utility model provides and portable terminal thereof, owing to adopted metal shell to be connected to ground connection on the portable terminal mainboard with microphone, the ground that makes metal shell not with the ground conducting of microphone circuit, played good shield effectiveness, and the filter capacitor that will have microphone inside now makes low-pass filter circuit into, filtering all high frequency clutters, further improved the effect of the antistatic and anti-radio frequency interference of microphone.
Be understandable that; for those of ordinary skills; can be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the utility model.
Claims (10)
1. the microphone of a portable terminal, described microphone is arranged on the portable terminal, it comprises a metal shell, it is characterized in that, in described metal shell, be provided with field effect transistor, the grid of described field effect transistor is by ECM module ground connection, and the drain electrode of field effect transistor is by the output port of first electric capacity connection microphone, the source ground of field effect transistor; Described metal shell is connected with the grounding ports of portable terminal mainboard.
2. the microphone of portable terminal according to claim 1 is characterized in that, is provided with filter circuit between the drain electrode of field effect transistor and first electric capacity.
3. the microphone of portable terminal according to claim 2 is characterized in that, described filter circuit is a low-pass filter circuit.
4. the microphone of portable terminal according to claim 3 is characterized in that, described filter circuit adopts the circuit structure of resistance and electric capacity parallel connection.
5. the microphone of portable terminal according to claim 1 is characterized in that, described field effect transistor is a N channel field-effect pipe.
6. portable terminal, it is characterized in that, described portable terminal is provided with microphone, described microphone comprises a metal shell, in described metal shell, be provided with field effect transistor, the grid of described field effect transistor is by ECM module ground connection, and the drain electrode of field effect transistor is by the output port of first electric capacity connection microphone, the source ground of field effect transistor; Described metal shell is connected with the grounding ports of portable terminal mainboard.
7. portable terminal according to claim 6 is characterized in that, is provided with filter circuit between the drain electrode of field effect transistor and first electric capacity.
8. portable terminal according to claim 7 is characterized in that, described filter circuit is a low-pass filter circuit.
9. portable terminal according to claim 8 is characterized in that, described filter circuit adopts the circuit structure of resistance and electric capacity parallel connection.
10. portable terminal according to claim 6 is characterized in that, described portable terminal is a mobile phone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202790134U CN201774652U (en) | 2010-07-30 | 2010-07-30 | Microphone of mobile terminal, mobile terminal employing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202790134U CN201774652U (en) | 2010-07-30 | 2010-07-30 | Microphone of mobile terminal, mobile terminal employing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201774652U true CN201774652U (en) | 2011-03-23 |
Family
ID=43754492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202790134U Expired - Fee Related CN201774652U (en) | 2010-07-30 | 2010-07-30 | Microphone of mobile terminal, mobile terminal employing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201774652U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186128A (en) * | 2010-07-30 | 2011-09-14 | 惠州Tcl移动通信有限公司 | Antistatic and anti-radio frequency interference microphone and mobile terminal |
| CN104735206A (en) * | 2015-03-25 | 2015-06-24 | 邝嘉怡 | Anti-interference mobile phone microphone |
| CN108933974A (en) * | 2017-05-24 | 2018-12-04 | 北京小米移动软件有限公司 | Eliminate the device and mobile device of microphone interference |
| CN112153182A (en) * | 2019-06-28 | 2020-12-29 | 西安中兴新软件有限责任公司 | Audio circuit and mobile terminal with same |
-
2010
- 2010-07-30 CN CN2010202790134U patent/CN201774652U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186128A (en) * | 2010-07-30 | 2011-09-14 | 惠州Tcl移动通信有限公司 | Antistatic and anti-radio frequency interference microphone and mobile terminal |
| CN102186128B (en) * | 2010-07-30 | 2014-09-10 | 惠州Tcl移动通信有限公司 | Antistatic and anti-radio frequency interference microphone and mobile terminal |
| CN104735206A (en) * | 2015-03-25 | 2015-06-24 | 邝嘉怡 | Anti-interference mobile phone microphone |
| CN108933974A (en) * | 2017-05-24 | 2018-12-04 | 北京小米移动软件有限公司 | Eliminate the device and mobile device of microphone interference |
| CN112153182A (en) * | 2019-06-28 | 2020-12-29 | 西安中兴新软件有限责任公司 | Audio circuit and mobile terminal with same |
| CN112153182B (en) * | 2019-06-28 | 2022-04-19 | 西安中兴新软件有限责任公司 | Audio circuit and mobile terminal with same |
| US11895469B2 (en) | 2019-06-28 | 2024-02-06 | Xi'an Zhongxing New Software Co. Ltd. | Audio circuit and mobile terminal provided with audio circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201887821U (en) | PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone | |
| CN201774652U (en) | Microphone of mobile terminal, mobile terminal employing same | |
| CN202889621U (en) | Interface system for vehicle-mounted electret microphone | |
| CN101466060B (en) | Electret condenser microphone | |
| CN102186128B (en) | Antistatic and anti-radio frequency interference microphone and mobile terminal | |
| CN104735206A (en) | Anti-interference mobile phone microphone | |
| CN205123720U (en) | Novel on -vehicle wireless data terminal | |
| CN107968975A (en) | Audio frequency broadcast system based on bandpass filter | |
| CN203942638U (en) | Audio input circuit | |
| CN106817644A (en) | A kind of mobile terminal and head circuit | |
| CN202856971U (en) | Electret microphone | |
| CN203912198U (en) | Anti-interference capacitive type microphone | |
| CN202444609U (en) | Anti-interference microphone circuit and circuit board thereof | |
| CN202111843U (en) | Sound for suppressing TDMA noises | |
| CN207603920U (en) | A kind of Electret Condencer Microphone | |
| CN201345731Y (en) | Electret capacitor microphone | |
| CN104754479A (en) | Wireless microphone for office meetings | |
| CN201995129U (en) | Anti-interference three-terminal microphone | |
| CN202153724U (en) | Active combination loudspeaker | |
| CN203015094U (en) | Audio frequency amplification circuit | |
| CN207010968U (en) | Loudspeaker and sound system | |
| CN207200951U (en) | A kind of audio amplification device for large-scale place | |
| CN201623832U (en) | Anti-electromagnetic interference miniature microphone | |
| CN201518533U (en) | Wireless microphone | |
| CN202019443U (en) | Electromagnetic radiation reducing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20130730 |