CN108881558A - Mobile terminal and its FM anti-jamming circuit - Google Patents
Mobile terminal and its FM anti-jamming circuit Download PDFInfo
- Publication number
- CN108881558A CN108881558A CN201810847328.5A CN201810847328A CN108881558A CN 108881558 A CN108881558 A CN 108881558A CN 201810847328 A CN201810847328 A CN 201810847328A CN 108881558 A CN108881558 A CN 108881558A
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- capacitor
- mobile terminal
- circuit
- jamming circuit
- inductance
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
- H04M1/0277—Details of the structure or mounting of specific components for a printed circuit board assembly
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
Abstract
The invention discloses a kind of mobile terminal and its FM anti-jamming circuits.The mobile terminal includes earphone base and FM chip, and the FM anti-jamming circuit includes：LC filter circuit and pi type filter；The ground terminal of the earphone base passes sequentially through the LC filter circuit and the pi type filter and is electrically connected with the FM chip.Anti-jamming circuit of the invention has well solved FM antenna and GSM antenna frequency range mutual interference problem, and can be achieved with circuit layout in lesser day space of lines.
Description
Technical field
The present invention relates to electronic technology field, in particular to a kind of mobile terminal and its FM (frequency modulation broadcasting) anti-interference electricity
Road.
Background technique
Existing mobile terminal, for example, mobile phone, laptop, PDA (palm PC) etc. are equipped with ear-phone function, FM
Function is as a standard configuration function of earphone and essential.But FM antenna and GSM (global system for mobile communications)
There is frequency range mutual interference in antenna.
Currently, FM antenna and GSM antenna frequency range mutual interference are generally solved the problems, such as using anti-jamming circuit as shown in Figure 1, but
The drawbacks of this mode, is that layout limits, which must be necessarily arranged at from the GSM antenna at least space of 5mm or more, causes electricity
Road occupies biggish arrangement space.
Summary of the invention
The technical problem to be solved by the present invention is in order to overcome the anti-jamming circuit of earphone base in the prior art can occupy compared with
The defect of big arrangement space provides a kind of earphone base and its anti-jamming circuit.
The present invention is to solve above-mentioned technical problem by following technical proposals：
A kind of FM anti-jamming circuit of mobile terminal, the mobile terminal include earphone base and FM chip, and the FM is anti-dry
Disturbing circuit includes：
LC filter circuit and pi type filter；
The ground terminal of the earphone base passes sequentially through the LC filter circuit and the pi type filter and FM chip electricity
Connection.
Preferably, the mobile terminal is suitable for GSM network；
The ratio between frequency and the GSM working frequency of mobile terminal of the LC filter circuit are 1/2.
Preferably, the LC filter circuit includes：First inductance and first capacitor；
One end of first inductance is electrically connected with the ground terminal, the other end of first inductance and first electricity
One end of appearance is electrically connected, the other end ground connection of the first capacitor.
Preferably, the capacitance of the first capacitor is less than or equal to 1nf.
Preferably, the pi type filter includes：Second capacitor, third capacitor and the second inductance；
One end of second capacitor is electrically connected with one end of one end of the first capacitor and the third capacitor respectively,
The other end of second capacitor is grounded；
The other end of the third capacitor is electrically connected with one end of second inductance and the FM chip respectively；
The other end of second inductance is grounded.
Preferably, the FM anti-jamming circuit further includes：First resistor and second resistance；
One end of the first resistor is electrically connected with one end of second capacitor, another termination of the first resistor
Ground；
One end of the second resistance is electrically connected with one end of second capacitor, the other end of the second resistance and institute
State the electrical connection of FM chip.
A kind of mobile terminal, the mobile terminal include the anti-interference electricity of FM as described in any one of claim 1-6
Road.
The positive effect of the present invention is that：Anti-jamming circuit of the invention has well solved FM antenna and GSM days
Line frequency range mutual interference problem, and can be achieved with circuit layout in lesser day space of lines.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the FM anti-jamming circuit of the embodiment of the present invention 1.
Fig. 2 is the circuit diagram of the FM anti-jamming circuit of the embodiment of the present invention 2.
Fig. 3 is the structural schematic diagram of the mobile terminal of the embodiment of the present invention 3.
Specific embodiment
The present invention is further illustrated below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
Embodiment 1
The present embodiment provides a kind of FM anti-jamming circuit of mobile terminal, mobile terminal includes earphone base 1, FM chip 2, FM
Antenna and GSM antenna, the mobile terminal are suitable for GSM network.
As shown in Figure 1, FM anti-jamming circuit includes：LC filter circuit 3 and pi type filter 4.The ground terminal of earphone base is successively
It is electrically connected by LC filter circuit and pi type filter with FM chip.
The anti-jamming circuit of the present embodiment includes two stage filter circuit, the anti-jamming circuit well solved FM antenna with
GSM antenna frequency range mutual interference problem, and the distance between the circuit and GSM antenna are unrestricted, in lesser day space of lines just
It is able to achieve circuit layout.
Embodiment 2
On the basis of embodiment 1, as shown in Fig. 2, the LC filter circuit 3 of the present embodiment includes：First inductance L1 and
One capacitor C1；One end of first inductance L1 is electrically connected with the ground terminal of earphone base, the other end and first capacitor of the first inductance L1
One end of C1 is electrically connected, the other end ground connection of first capacitor C1.Wherein, the capacitance of first capacitor is less than or equal to 1nf.
LC filter circuit can be effectively isolated interference of the FM antenna to GSM antenna, when the frequency of LC filter circuit and movement are whole
When the ratio between the GSM working frequency at end is 1/2, effect is best.Also even GSM working frequency is 850MHz, then LC filter circuit
Frequency is convenient in 425MHz, according to the frequency calculation formula f=1/ (2*Pi*sqrt (L1*C1)) of LC filter circuit, the first electricity
Sense L1 and first capacitor C1 selects 82nh inductance and 1.8pf capacitor appropriate respectively.
In the present embodiment, pi type filter 4 includes：Second capacitor C2, third capacitor C3 and the second inductance L2；Second capacitor
One end of C2 is electrically connected with one end of one end of first capacitor C1 and third capacitor C3 respectively, another termination of the second capacitor C2
Ground；The other end of third capacitor C3 is electrically connected with one end of the second inductance L2 and FM chip respectively；The other end of second inductance L2
Ground connection.
LCC type pi type filter can effectively reduce interference of the GSM antenna to FM antenna.Specifically, the second inductance L2 is selected
56nh inductance, the third capacitor C3 for the 1nf that arranges in pairs or groups can filter out TDD (time division duplex) interference of 217MHZ.The electricity of second capacitor C2
Capacitance is optionally selected, such as can be 33p f capacitor or 100pf capacitor, can filter out GSM900 1800 interference.
In the present embodiment, FM anti-jamming circuit further includes：First resistor R1 and second resistance R2；One end of first resistor R1
It is electrically connected with one end of the second capacitor C2, the other end ground connection of first resistor R1；One end of second resistance R2 and the second capacitor C2
One end electrical connection, the other end of second resistance R2 is electrically connected with FM chip.
Resistance can effectively prevent interference of the audio of earphone base audio input end to FM chip.
The FM anti-jamming circuit very good solution of the present embodiment FM antenna and GSM antenna frequency range mutual interference problem, can not only
Effectively avoid interference of the FM antenna to the interference, GSM antenna of GSM antenna to FM antenna, moreover it is possible to effectively prevent earphone base audio defeated
Enter interference of the audio at end to FM chip, and the distance between the circuit and GSM antenna are unrestricted, can effectively reduce mobile whole
The antenna arrangement space at end, and then reduce size of mobile terminals.
Embodiment 3
The present invention provides a kind of mobile terminal, can have FM anti-jamming circuit shown in fig. 1 or fig. 2.
The mobile terminal can be include mobile phone, tablet computer, PDA (Personal Digital Assistant, it is personal
Digital assistants), POS (Point of Sales, point-of-sale terminal), the terminal devices such as vehicle-mounted computer, be by mobile phone of mobile terminal
Example, Fig. 3 show the block diagram of the part-structure of mobile phone 300 relevant to mobile terminal provided in an embodiment of the present invention.With reference to
Fig. 3, mobile phone 300 include RF (Radio Frequency, radio frequency) circuit 310, memory 320, input unit 330, display unit
340, sensor 350, voicefrequency circuit 360, WiFi (wireless fidelity, Wireless Fidelity) module 370, processor 380,
And the equal components of power supply 390.It will be understood by those skilled in the art that handset structure shown in Fig. 3 only does the act of implementation
Example, does not constitute the restriction to mobile phone, may include than illustrating more or fewer components, perhaps combine certain components or
Different component layouts.
It is specifically introduced below with reference to each component parts of the Fig. 3 to mobile phone 300：
Display unit 340 can be used for showing information input by user or the information and mobile phone 300 that are supplied to user
Various menus.Display unit 340 may include display panel 341, optionally, can use LCD (Liquid Crystal
Display, liquid crystal display), the forms such as OLED (Organic Light-Emitting Diode, Organic Light Emitting Diode) come
Configure display panel 341.Further, touch panel 331 can cover display panel 341, when touch panel 331 is detected at it
On or near touch operation after, send processor 380 to determine the type of touch event, be followed by subsequent processing device 380 according to touching
The type for touching event provides corresponding visual output on display panel 341.Although in Fig. 3, touch panel 331 and display surface
Plate 341 is the input and input function for realizing mobile phone 300 as two independent components, but in certain embodiments, it can
That mobile phone 300 is realized so that touch panel 331 and display panel 341 is integrated outputs and inputs function.
RF circuit 310 can be used for receiving and sending messages or communication process in, signal sends and receivees, particularly, by base station
After downlink information receives, handled to processor 380；In addition, the data for designing uplink are sent to base station.In general, RF circuit packet
Include but be not limited to antenna, at least one amplifier, transceiver, coupler, LNA (Low Noise Amplifier, low noise
Amplifier), duplexer etc..In addition, RF circuit 310 can also be communicated with network and other equipment by wireless communication.The nothing
Any communication standard or agreement, including but not limited to GSM (Global System of Mobile can be used in line communication
Communication, global system for mobile communications), GPRS (General Packet Radio Service, general packet without
Line service), CDMA (Code Division Multiple Access, CDMA), WCDMA (Wideband Code
Division Multiple Access, wideband code division multiple access), LTE (Long Term Evolution, long term evolution), electronics
Mail, SMS (Short Messaging Service, short message service) etc..
Memory 320 can be used for storing software program and module, and processor 380 is stored in memory 320 by operation
Software program and module, thereby executing the various function application and data processing of mobile phone 300.Memory 320 can be main
Including storing program area and storage data area, wherein storing program area can answer needed for storage program area, at least one function
With program (such as sound-playing function, image player function etc.) etc.；Storage data area, which can be stored, uses institute according to mobile phone 300
Data (such as audio data, phone directory etc.) of creation etc..In addition, memory 320 may include high-speed random access memory,
It can also include nonvolatile memory, a for example, at least disk memory, flush memory device or other volatile solid-states are deposited
Memory device.
Input unit 330 can be used for receiving the number or character information of input, and generate the user setting with mobile phone 300
And the related key signals input of function control.Specifically, input unit 330 may include touch panel 331 and other inputs
Equipment 332.Touch panel 331, also referred to as touch screen, collecting the touch operation of user on it or nearby, (for example user makes
With the operation of any suitable object or attachment such as finger, stylus on touch panel 331 or near touch panel 331), and
Corresponding attachment device is driven according to preset formula.Optionally, touch panel 331 may include touch detecting apparatus and touching
Touch two parts of controller.Wherein, the touch orientation of touch detecting apparatus detection user, and detect touch operation bring letter
Number, transmit a signal to touch controller；Touch controller receives touch information from touch detecting apparatus, and is converted into
Contact coordinate, then give processor 380, and order that processor 380 is sent can be received and executed.Furthermore, it is possible to using
The multiple types such as resistance-type, condenser type, infrared ray and surface acoustic wave realize touch panel 331.It is defeated in addition to touch panel 331
Entering unit 330 can also include other input equipments 332.Specifically, other input equipments 332 can include but is not limited to physics
One of keyboard, function key (such as volume control button, switch key etc.), trace ball, mouse, operating stick etc. are a variety of.
Mobile phone 300 may also include at least one sensor 350, such as optical sensor, motion sensor and other sensings
Device.Specifically, optical sensor may include ambient light sensor and proximity sensor, wherein ambient light sensor can be according to environment
The light and shade of light adjusts the brightness of display panel 341, and proximity sensor can close display when mobile phone 300 is moved in one's ear
Panel 341 and/or backlight.As a kind of motion sensor, accelerometer sensor can detect (generally three in all directions
Axis) acceleration size, can detect that size and the direction of gravity when static, can be used to identify mobile phone posture application (such as
Horizontal/vertical screen switching, dependent game, magnetometer pose calibrating), Vibration identification correlation function (such as pedometer, tap) etc.；As for
The other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor that mobile phone 300 can also configure, herein not
It repeats again.
Voicefrequency circuit 360, loudspeaker 361, microphone 362 can provide the audio interface between user and mobile phone 300.Audio
Electric signal after the audio data received conversion can be transferred to loudspeaker 361, be converted to sound by loudspeaker 361 by circuit 360
Sound signal output；On the other hand, the voice signal of collection is converted to electric signal by microphone 362, after being received by voicefrequency circuit 360
Audio data is converted to, then by after the processing of audio data output processor 380, through RF circuit 310 to be sent to such as the other hand
Machine, or audio data is exported to memory 320 to be further processed.
WiFi belongs to short range wireless transmission technology, and mobile phone 300 can help user's transceiver electronics by WiFi module 370
Mail, browsing webpage and access streaming video etc., it provides wireless broadband internet access for user.Although Fig. 3 is shown
WiFi module 370, but it is understood that, and it is not belonging to must be configured into for mobile phone 300, it can according to need completely
Do not change in the range of the essence of invention and omits.
Processor 380 is the control centre of mobile phone 300, utilizes each portion of various interfaces and connection whole mobile phone
Point, by running or execute the software program and/or module that are stored in memory 320, and calls and be stored in memory 320
Interior data execute the various functions and processing data of mobile phone 300, to carry out integral monitoring to mobile phone.Optionally, processor
380 may include one or more processing units；Preferably, processor 380 can integrate application processor and modem processor,
Wherein, the main processing operation system of application processor, user interface and application program etc., modem processor mainly handles nothing
Line communication.It is understood that above-mentioned modem processor can not also be integrated into processor 380.
Mobile phone 300 further includes the power supply 390 (such as battery) powered to all parts, it is preferred that power supply can pass through electricity
Management system and processor 380 are logically contiguous, to realize management charging, electric discharge and power consumption by power-supply management system
The functions such as management.
Although being not shown, mobile phone 300 can also include camera, bluetooth module etc., and details are not described herein.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that this is only
For example, protection scope of the present invention is to be defined by the appended claims.Those skilled in the art without departing substantially from
Under the premise of the principle and substance of the present invention, many changes and modifications may be made, but these change and
Modification each falls within protection scope of the present invention.
Claims (7)
1. a kind of FM anti-jamming circuit of mobile terminal, the mobile terminal includes earphone base and FM chip, which is characterized in that institute
Stating FM anti-jamming circuit includes：
LC filter circuit and pi type filter；
The ground terminal of the earphone base passes sequentially through the LC filter circuit and the pi type filter and is electrically connected with the FM chip
It connects.
2. the FM anti-jamming circuit of mobile terminal as described in claim 1, which is characterized in that the mobile terminal is suitable for
GSM network；
The ratio between frequency and the GSM working frequency of mobile terminal of the LC filter circuit are 1/2.
3. the FM anti-jamming circuit of mobile terminal as described in claim 1, which is characterized in that the LC filter circuit includes：
First inductance and first capacitor；
One end of first inductance is electrically connected with the ground terminal, the other end and the first capacitor of first inductance
One end electrical connection, the other end ground connection of the first capacitor.
4. the FM anti-jamming circuit of mobile terminal as claimed in claim 3, which is characterized in that the capacitance of the first capacitor is small
In equal to 1nf.
5. the FM anti-jamming circuit of mobile terminal as described in claim 1, which is characterized in that the pi type filter includes：The
Two capacitors, third capacitor and the second inductance；
One end of second capacitor is electrically connected with one end of one end of the first capacitor and the third capacitor respectively, described
The other end of second capacitor is grounded；
The other end of the third capacitor is electrically connected with one end of second inductance and the FM chip respectively；
The other end of second inductance is grounded.
6. the FM anti-jamming circuit of mobile terminal as claimed in claim 5, which is characterized in that the FM anti-jamming circuit also wraps
It includes：First resistor and second resistance；
One end of the first resistor is electrically connected with one end of second capacitor, the other end ground connection of the first resistor；
One end of the second resistance is electrically connected with one end of second capacitor, the other end of the second resistance and the FM
Chip electrical connection.
7. a kind of mobile terminal, which is characterized in that the mobile terminal includes the FM as described in any one of claim 1-6
Anti-jamming circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847328.5A CN108881558B (en) | 2018-07-27 | 2018-07-27 | Mobile terminal and FM anti-jamming circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810847328.5A CN108881558B (en) | 2018-07-27 | 2018-07-27 | Mobile terminal and FM anti-jamming circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN108881558A true CN108881558A (en) | 2018-11-23 |
| CN108881558B CN108881558B (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810847328.5A Active CN108881558B (en) | 2018-07-27 | 2018-07-27 | Mobile terminal and FM anti-jamming circuit thereof |
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| CN (1) | CN108881558B (en) |
Cited By (4)
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| CN109743653A (en) * | 2019-01-21 | 2019-05-10 | 闻泰通讯股份有限公司 | Head circuit structure and communication apparatus |
| CN109756202A (en) * | 2019-01-30 | 2019-05-14 | 华勤通讯技术有限公司 | A kind of motor drive circuit and terminal |
| CN112882063A (en) * | 2021-01-12 | 2021-06-01 | 上海移远通信技术股份有限公司 | Positioning module and communication equipment |
| CN118041381A (en) * | 2024-03-04 | 2024-05-14 | 荣耀终端有限公司 | Frequency modulation broadcast circuit and electronic equipment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112882063A (en) * | 2021-01-12 | 2021-06-01 | 上海移远通信技术股份有限公司 | Positioning module and communication equipment |
| CN118041381A (en) * | 2024-03-04 | 2024-05-14 | 荣耀终端有限公司 | Frequency modulation broadcast circuit and electronic equipment |
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| Publication number | Publication date |
|---|---|
| CN108881558B (en) | 2021-03-12 |
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Address after: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Applicant after: Huaqin Technology Co.,Ltd. Address before: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Applicant before: Huaqin Technology Co.,Ltd. Address after: Building 1, No. 399 Keyuan Road, Zhangjiang hi tech park, Pudong New Area, Shanghai, 201203 Applicant after: Huaqin Technology Co.,Ltd. Address before: 201203 Building 1, 399 Zhangyuan Road, Zhangjiang, Pudong New Area, Shanghai Applicant before: HUAQIN TELECOM TECHNOLOGY Co.,Ltd. |
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