CN205901841U - PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone - Google Patents
PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone Download PDFInfo
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- CN205901841U CN205901841U CN201620889109.XU CN201620889109U CN205901841U CN 205901841 U CN205901841 U CN 205901841U CN 201620889109 U CN201620889109 U CN 201620889109U CN 205901841 U CN205901841 U CN 205901841U
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Abstract
The utility model relates to a PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone, including central processing unit, central processing unit one side is first electric capacity of electric connection and second electric capacity respectively, the first resistance of first electric capacity electric connection, first resistance passes through INP pin electric connection audio amplifier, second electric capacity electric connection second resistance, second resistance passes through INN pin electric connection audio amplifier, the audio amplifier bottom is equipped with the GND pin, just GND pin electric connection ground wire, the audio amplifier top is equipped with the VDD pin, just VDD pin one side electric connection mobile phone batteries to through third electric capacity electric connection ground wire, audio amplifier one side is equipped with VOP pin and VON pin respectively, the VOP pin is through first inductance electric connection SP1 pin, the VON pin passes through second inductance electric connection SP2 pin, and is with low costs, reliable and simple, and improve very obviously to speech qualities such as hands -free and earphones.
Description
Technical field
This utility model is related to a kind of pcb cabling circuit of suppression mobile phone tdd noise, belongs to mobile phone noise suppressed field.
Background technology
All there is produce because of time division multiple acess tdma working method either large or small in the mobile phone of all of gsm standard at present
Timesharing distortion noise tdd noise, and affect speech quality, the tdma of the gsm mobile phone impact to mobile phone speech quality is mainly
Being crosstalked into audio frequency thus causing audio frequency amplifier to produce tdd noise from circuit, being reset by electro-acoustic element and producing.
Content of the invention
The technical problems to be solved in the utility model overcomes existing defect, provides a kind of pcb of suppression mobile phone tdd noise
Cabling circuit, carries out the isometric control of difference to the input cabling of audio frequency amplifier, is not required to additionally increase device, low cost, simply
Easy, and the speech qualities such as hands-free and earphone are improved clearly, Consumer's Experience can get significant increase.
In order to solve above-mentioned technical problem, this utility model provides following technical scheme:
A kind of pcb cabling circuit of suppression mobile phone tdd noise, including central processing unit, described central processing unit side is divided
It is not electrically connected with the first electric capacity and the second electric capacity, described first electric capacity is electrically connected with first resistor, and described first resistor passes through inp
Pin is electrically connected with audio frequency amplifier, and described second electric capacity is electrically connected with second resistance, and described second resistance passes through inn pin electricity
Property connect audio frequency amplifier, described audio frequency amplifier bottom is provided with gnd pin, and described gnd pin is electrically connected with ground wire, described
Audio frequency amplifier top is provided with vdd pin, and described vdd pin side is electrically connected with battery of mobile phone, and by the 3rd electric capacity electricity
Property connect ground wire, described audio frequency amplifier side is respectively equipped with vop pin and von pin, and described vop pin passes through the first inductance
It is electrically connected with sp1 pin, described von pin passes through the second inductance and is electrically connected with sp2 pin, and described sp1 pin is equal with sp2 pin
It is electrically connected with speaker, between described first inductance and described sp1 pin, be from left to right connected with the 4th electric capacity, the first electricity in turn
Pole pipe and the first Electro-static Driven Comb element, and described 4th electric capacity, first electrode pipe and first Electro-static Driven Comb element one end ground connection, institute
State and be provided with the 5th electric capacity, second electrode pipe and the second Electro-static Driven Comb element between the second inductance and described sp2 pin, and described
Five electric capacity, second electrode pipe and second Electro-static Driven Comb element one end ground connection.
Furthermore, described inp pin input end and the pcb cabling of inn pin input end are differential lines, and this difference
Line be isometric, etc. equidistant between thick, line, parallel and close to differential lines.
Furthermore, model aw8010a of described audio frequency amplifier.
Furthermore, described Electro-static Driven Comb element esd is mainly made up of tvs array.
This utility model beneficial effect: the input cabling of audio frequency amplifier is carried out difference isometric, etc. thick, parallel and close to
Control, the principle using the anti-common-mode noise of differential lines filters to entering the interference signal in differential lines, is not required to additionally increase
Device, low cost, simple, and the speech qualities such as hands-free and earphone are improved clearly, Consumer's Experience can get greatly
Lifting.
Brief description
Accompanying drawing is used for providing further understanding to of the present utility model, and constitutes a part for description, with this practicality
New embodiment is used for explaining this utility model together, does not constitute to restriction of the present utility model.
Fig. 1 is a kind of pcb cabling circuit structure diagram of this utility model suppression mobile phone tdd noise.
In figure label: 1, central processing unit；2nd, the first electric capacity；3rd, the second electric capacity；4th, first resistor；5th, inp pin；6th, sound
Audio amplifier；7th, second resistance；8th, inn pin；9th, gnd pin；10th, vdd pin；11st, battery of mobile phone；12nd, the 3rd electric capacity；
13rd, vop pin；14th, von pin；15th, the first inductance；16th, sp1 pin；17th, the second inductance；18th, sp2 pin；19th, raise one's voice
Device；20th, the 4th electric capacity；21st, first electrode pipe；22nd, the first Electro-static Driven Comb element；23rd, the 5th electric capacity；24th, second electrode pipe；
25th, the second Electro-static Driven Comb element；.
Specific embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is illustrated it will be appreciated that described herein excellent
Select embodiment to be merely to illustrate and explain this utility model, be not used to limit this utility model.
As shown in figure 1, a kind of pcb cabling circuit of suppression mobile phone tdd noise, including central processing unit 1, described centre
Reason device 1 side is electrically connected with the first electric capacity 2 and the second electric capacity 3, and described first electric capacity 2 is electrically connected with first resistor 4, described
First resistor 4 is electrically connected with audio frequency amplifier 6 by inp pin 5, and described second electric capacity 3 is electrically connected with second resistance 7, described
Second resistance 7 is electrically connected with audio frequency amplifier 6 by inn pin 8, and described audio frequency amplifier 6 bottom is provided with gnd pin 9, and institute
State gnd pin 9 and be electrically connected with ground wire, described audio frequency amplifier 6 top is provided with vdd pin 10, and described vdd pin 10 side electricity
Property connect battery of mobile phone 11, and by the 3rd electric capacity 12 be electrically connected with ground wire, described audio frequency amplifier 6 side is respectively equipped with vop
Pin 13 and von pin 14, described vop pin 13 is electrically connected with sp1 pin 16, described von pin 14 by the first inductance 15
Sp2 pin 18 is electrically connected with by the second inductance 17, described sp1 pin 16 is all electrically connected with speaker 19, institute with sp2 pin 18
State and between the first inductance 15 and described sp1 pin 16, be from left to right connected with the 4th electric capacity 20, first electrode pipe 21 and in turn
One Electro-static Driven Comb element 22, and described 4th electric capacity 20, first electrode pipe 21 and the first Electro-static Driven Comb element 22 one end ground connection, institute
State and between the second inductance 17 and described sp2 pin 18, be provided with the 5th electric capacity 23, second electrode pipe 24 and the second Electro-static Driven Comb element
25, and described 5th electric capacity 23, second electrode pipe 24 and the second Electro-static Driven Comb element 25 one end ground connection.
The pcb cabling of described inp pin 5 input and inn pin 8 input is differential lines, and this differential lines be isometric,
Equidistant between on thick, line, parallel and close to differential lines, differential lines anti-common mode principle can be effectively utilized in differential lines
Interference signal is filtered, and can more effectively filter, model aw8010a of described audio frequency amplifier 6, this model amplifier
Built-in proprietary sequential control circuit, the system that effectively eliminates in upper electric, lower electricity, wake-up and turns off the wink being likely to occur during operation
State noise, is additionally provided with overcurrent, overheat protective function inside this model amplifier, and protection chip is in abnormal operation effectively
Under be not destroyed, described first Electro-static Driven Comb element 22 is mainly made up of tvs array with the second Electro-static Driven Comb element 25, and it is excellent
Point is small volume, and junction capacity is low, and response speed is fast etc..
When using, the tdd noise jamming that central processing unit output produces is inputted this utility model by audio frequency amplifier
Line amplifying, when interference flows through differential lines, because differential lines are parallel, isometric, symmetrically, so interference signal will necessarily be impartial
Give two differential lines, differential lines anti-common mode principle can be effectively utilized the interference signal in differential lines is filtered, shape
Become common-mode signal, this common-mode signal is delivered to homophase and the inverting input of amplifier respectively by pin, asked in amplifier
With because modulus value is equal, in opposite direction so signal is cancelled out each other, through lc filtering and Electro-static Driven Comb so that defeated
Go out to hold the glitch-free audio signal of final output, such that it is able to effectively reduce tdd interference.
It is this utility model preferably embodiment above, this utility model those skilled in the art can also be to upper
State embodiment to be changed and change, therefore, this utility model is not limited to above-mentioned specific embodiment, every ability
Any conspicuously improved, replacement that field technique personnel are made on the basis of this utility model or modification belong to this practicality
New protection domain.
Claims (4)
1. a kind of pcb cabling circuit of suppression mobile phone tdd noise, including central processing unit (1) it is characterised in that described central authorities
Processor (1) side is electrically connected with the first electric capacity (2) and the second electric capacity (3), and described first electric capacity (2) is electrically connected with first
Resistance (4), described first resistor (4) is electrically connected with audio frequency amplifier (6), described second electric capacity (3) electricity by inp pin (5)
Property connect second resistance (7), described second resistance (7) by inn pin (8) be electrically connected with audio frequency amplifier (6), described audio frequency
Amplifier (6) bottom is provided with gnd pin (9), and described gnd pin (9) is electrically connected with ground wire, described audio frequency amplifier (6) top
Portion is provided with vdd pin (10), and described vdd pin (10) side is electrically connected with battery of mobile phone (11), and passes through the 3rd electric capacity
(12) it is electrically connected with ground wire, described audio frequency amplifier (6) side is respectively equipped with vop pin (13) and von pin (14), described
Vop pin (13) is electrically connected with sp1 pin (16) by the first inductance (15), and described von pin (14) passes through the second inductance
(17) it is electrically connected with sp2 pin (18), described sp1 pin (16) and sp2 pin (18) are all electrically connected with speaker (19), described
From left to right it is connected with the 4th electric capacity (20), first electrode pipe in turn between first inductance (15) and described sp1 pin (16)
(21) with the first Electro-static Driven Comb element (22), and described 4th electric capacity (20), first electrode pipe (21) and the first Electro-static Driven Comb unit
Part (22) one end is grounded, and is provided with the 5th electric capacity (23), second electrode between described second inductance (17) and described sp2 pin (18)
Pipe (24) and the second Electro-static Driven Comb element (25), and described 5th electric capacity (23), second electrode pipe (24) and the second Electro-static Driven Comb
Element (25) one end is grounded.
2. according to claim 1 a kind of suppression mobile phone tdd noise pcb cabling circuit it is characterised in that: described inp draws
The pcb cabling of foot (5) input and inn pin (8) input is differential lines, and this differential lines be isometric, etc. equidistant between thick, line
From, parallel and close to differential lines.
3. according to claim 1 a kind of suppression mobile phone tdd noise pcb cabling circuit it is characterised in that: described audio frequency is put
Model aw8010a of big device (6).
4. according to claim 1 a kind of suppression mobile phone tdd noise pcb cabling circuit it is characterised in that: described first is quiet
Electric releasing member (22) is mainly made up of tvs array with the second Electro-static Driven Comb element (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620889109.XU CN205901841U (en) | 2016-08-16 | 2016-08-16 | PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620889109.XU CN205901841U (en) | 2016-08-16 | 2016-08-16 | PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205901841U true CN205901841U (en) | 2017-01-18 |
Family
ID=57779347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620889109.XU Expired - Fee Related CN205901841U (en) | 2016-08-16 | 2016-08-16 | PCB (printed circuit board) wiring circuit for restraining TDD (time division duplex) noise of cell phone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205901841U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565529A (en) * | 2017-08-31 | 2018-01-09 | 广东欧珀移动通信有限公司 | Electrostatic protection apparatus, radio circuit and electronic equipment |
-
2016
- 2016-08-16 CN CN201620889109.XU patent/CN205901841U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107565529A (en) * | 2017-08-31 | 2018-01-09 | 广东欧珀移动通信有限公司 | Electrostatic protection apparatus, radio circuit and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170118 Termination date: 20180816 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |