CN1332534A - Netted power supply wire configuration and circuit structure - Google Patents
Netted power supply wire configuration and circuit structure Download PDFInfo
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- CN1332534A CN1332534A CN 00125623 CN00125623A CN1332534A CN 1332534 A CN1332534 A CN 1332534A CN 00125623 CN00125623 CN 00125623 CN 00125623 A CN00125623 A CN 00125623A CN 1332534 A CN1332534 A CN 1332534A
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Abstract
The circuit structure of netted power supply wire configuration is formed through modular division of the circuit, configuration of netted power supply wires according to the sorts of power supply, merging the adjacent similar power supply wires, and finally introducing corresponding power supplies. The present invention is suitable for the circuit sensitive to the power supply interference noise, especially the analog user's board of communication equipoment. The present invention can raise the capacity of circuit to resist serial-mode noise and common-mode noise of power supply and wire group noise and lower the maintenance cost of power supply equipment.
Description
The present invention relates to the analog subscriber interface circuit on the communication equipment, how to be specifically related to the antijamming capability that method for arranging by improving power line on the circuit board and circuit structure improve the analog subscriber interface circuit, thereby to improve the total distortion index of interface circuit.
Definition according to analog subscriber interface circuit total distortion index, total distortion is the signal that forms a complete connection occur between the two wires of communication equipment such as digital stored-program control exchange analog interface (Z interface) ratio to total distortion power, the principal element that influences it is the ratio of the signal of PCM path conversion equipment to total distortion, and the distorted signals that PCM path conversion equipment produces is direct and power supply noise, the noise of circuit itself and encoding and decoding noise are relevant, and power supply noise is the main cause of influence index in the side circuit, so generally all how suppressing power supply noise design as a key technology when the design simulation subscriber line circuit.
Power supply noise can be divided into the noise directly introduced from power supply itself and application circuit owing to the common impedance coupled noise that exists the public power impedance to produce.First kind of situation comprises power supply series mode noise (can be described as ripple) and common-mode noise, and second kind of situation comprises that the line on power line line resistance noise and the ground wire hinders noise.In " the practical Anti-Jamming Technique of electronic circuit " (People's Telecon Publishing House, the Zhu Bangtian work, 1994) in the book, anti-interference principle according to analog circuit, at chapter 4 the 5th joint, the coupled noise that has proposed to overcome the ground wire common impedance is important measures of operational amplification circuit, mainly be that reasonable cabling by ground wire in the printed board makes ground wire common impedance minimum reduce the ground wire noise jamming, as ground level is set, mainly realize with the interlayer that increases printed board and its method that is set to ground level; Also add fly line, make earth-return electric current herein directly flow to ground wire tandem place, produce interference signal etc. to avoid the current reflux path just like crucial part.In the chapter 1 first segment of this book, also proposed for the method that overcomes common-mode noise, exactly will be by improving the basic theories that application circuit impedance line longitudinal balance overcomes.
But for the analog subscriber interface circuit in the digital SPC exchange,, must be designed to double sided board to the analog subscriber interface card, that is to say, special bus plane and ground plane can not be set under the pressure of the pressure of cost.In order to be suitable for the clean and tidy of batch production on production and sheet material, the method for welding fly line is also inadvisable, so the above-mentioned method that overcomes the common impedance noise is just improper here.And if the impedance line longitudinal balance that the power line on the general analog subscriber interface card is walked in the line process designs to such an extent that be not fine, the ability of so anti-power supply common-mode noise is just not high.
In the The field of reality, because the instability of Alternating Current Power Supply, long-time back ageing equipment, or reason such as the power-supply device performance is inconsistent can produce very big power supply noise, and this type of phenomenon is more common.And power supply noise can directly influence the equipment performance index, and concerning the user of stored-program control exchange, background noise is big when mainly showing as conversation, and speech quality descends, and networking speed reduces, and also can make the user can't use phone when serious.In case this type of situation occurs, will change power-supply device, the corresponding maintenance cost that increased.If can under the situation of motionless power-supply device, strengthen the anti-power supply interference performance of subscriber line circuit, so also just improved the performance of switch, reduced maintenance cost.
The power line of nowadays general analog subscriber circuit board comprises+5V, GND, and-5V etc. adopt the dendroid wire structures, or series connection shape wire structures, and these cablings of overstriking of trying one's best.These methods have strengthened the antijamming capability of circuit to a certain extent, improved the total distortion index of analog subscriber interface, under general power supply normal power supply situation, these methods can guarantee to reach 14.1dBr " the total technical specification book of Ministry of Posts and Telecommunications's telephony switching gear " (YDN 065-1997) requirement to the total distortion index at-45dBm point, but effect is unsatisfactory in some cases, unclean as the frame power supply, on power line, added common mode interference signal, a common-mode noise AC signal is under the unbalanced situation of load two ends earth impedance, it has produced voltage difference at the load two ends, thereby be for conversion into string mould signal, this string mould AC signal will directly be superimposed upon on the load signal, thereby influences the AC characteristic of this load.At this moment shape or the dendroid of connecting wiring just cannot overcome the series mode interference signal that common mode interference signal is transformed into fully, thereby directly influence is to the total distortion index of power supply sensitivity, and this phenomenon has very big generality.So, we just wish to take other circuit structure to suppress this type of interference signal.
In order to solve the above problems, one of the object of the invention just is to provide a kind of method for arranging of netted power supply wire to introduce the interference of the various noises of power supply to circuit with reduction, improves the performance of circuit;
Two of the object of the invention is to provide a kind of circuit structure of netted power supply wire layout, can make the ability of the existing anti-common impedance noise of analog line circuit interface board, the ability that anti-power supply common-mode noise is arranged again, thereby strengthen the comprehensive antijamming capability of analog line circuit interface board, improve the total distortion index of interface circuit.It is as follows that the present invention carries out the performing step of netted power supply wire method for arranging: the first step, the formation of circuit is carried out Module Division;
1. the power supply the principle of each single circuit module of Hua Fening is identical, all arrays of modules combination structures
Become complete circuit;
Described each single circuit module all may be separately formed a power supply power supply loop;
2. list the required power source voltage kind of each single circuit module respectively; In second step, circuit is carried out netted power supply wire respectively by the difference of supply voltage kind arrange;
1. select a kind of supply voltage wherein to determine which single circuit module has this power supply to need in the circuit
Ask;
2. there is each the power line of the single circuit module of this power supply requirement to be arranged to a net respectively
The trellis loop;
3. the power line of the bound fraction of the adjacent mesh loops in two positions being merged into an integral body walks
Line;
4. other supply voltage kind in the circuit is also advanced by 1 to 3 steps in sequence as above respectively
The row netted power supply wire is arranged; At last, the kind difference according to power supply is provided with inlet port at power import place separately respectively;
The circuit structure of netted power supply wire of the present invention is by each single circuit module and be looped around around the single circuit module power line of various supply power voltages and form, and each single circuit module is powered by being looped around its power line all around respectively;
The described supply power voltage that is looped around the power line around the single circuit module be respectively by around the required voltage kind of single circuit module;
For non-earth cord network, can add a filter capacitor respectively at the initiating terminal and the least significant end of integral grid wiring, can also improve the ability of anti-power supply series mode noise so simultaneously.
The present invention comprises+5V by the power line to the analog subscriber interface board, and GND ,-5V carry out that special latticed wiring realizes, and can be generalized to the applied voltage of various reality for the kind of power supply.A common-mode noise AC signal will exert an influence to circuit, must under the unbalanced situation of load two ends earth impedance, just can take place, it has produced voltage difference at the load two ends, thereby be for conversion into string mould signal, this string mould AC signal will directly be superimposed upon on the load signal, thereby influences the AC characteristic of this load.For the analog subscriber interface circuit in the digital SPC exchange, power supply+5V and GND exist certain common mode noise signal to the earth between-5V and the GND, and this signal amplitude is very little generally speaking, and is little to the influence of circuit.Under rugged environment, when filtering the alternating current common-mode signal, totally do not make this common-mode signal directly be transferred to the direct current supply branch road of subordinate as rectifier, thereby directly enter subscriber line circuit, this common mode noise signal is perhaps very big, at this moment, if it is bad to the impedance balance degree of the earth that load is the user interface circuit two ends, this common mode noise signal will change the series mode noise signal into and directly be superimposed upon and make signal produce bigger distortion on the signal level in circuit so, thereby directly influence circuit total distortion index.The present invention makes the impedance balance degree optimization of load two ends to the earth by special wiring, and the amplitude that common mode noise signal changes the series mode noise signal into is reduced greatly, thereby reduces the influence to the total distortion index.Simultaneously, because latticed wiring has also reduced the line impedance of power line greatly, thereby the noise that also inhibition ground wire common impedance is caused plays good effect.The present invention is to the not influence of other performance index of analog subscriber interface circuit.
Further set forth method of the present invention below in conjunction with accompanying drawing.
What Fig. 1 represented is to adopt method of the present invention to arrange the flow chart of power line;
What Fig. 2 represented is that common-mode signal is the circuit theory diagrams that how to change string mould signal in circuit;
What Fig. 3 represented is the circuit theory diagrams that cause noise of ground wire common impedance;
What Fig. 4 represented is dendroid power line arrangement schematic diagram;
What Fig. 5 represented is the total distortion index schematic diagram that adopts the postpone of dendroid power line cloth;
What Fig. 6 represented is series connection shape power line arrangement schematic diagram;
What Fig. 7 represented is the total distortion index schematic diagram that adopts the postpone of series connection shape power line cloth;
What Fig. 8 represented is the power line arrangement schematic diagram that the present invention adopts;
Fig. 9 represents is the total distortion index schematic diagram of the netted power supply wire cloth postpone adopted of the present invention;
The job step of netted layout power line method of the present invention as described above, flow chart is referring to Fig. 1.Which kind of need to prove: adopt method to come the cloth power line, mainly see the requirement of circuit: if mainly be anti-power supply series mode noise, or only need improve the earth resistance performance, then only need common ground cloth is become latticed; If also will resist the common-mode noise between the power positive cathode to disturb simultaneously, then ground wire cloth is being become the latticed while, also need+5V, or-(mainly see which kind of influence greatly, influence big should at first considering) cloth such as 5V become latticed.
Fig. 2 has represented that common-mode signal is the principle that how to change string mould signal in circuit.Z shown in the figure
1, Z
2, Z
3, Z
4Be line impedance, Z is a line load, and e joins Z when common-mode signal
1, Z
2Behind the end, produced string mould signal e at the two ends of load Z
12:
Work as Z
1=Z
2, Z
3=Z
4The time, e
12=0, promptly common-mode signal can't be converted to string mould signal, this moment circuit earth impedance complete equipilibrium, thereby load Z is not subjected to the influence of common-mode signal fully.And this situation is unlikely to take place in the side circuit, as long as Z
1≠ Z
2, or Z
3≠ Z
4, e then
12≠ 0, the string mould signal that Here it is produces at the load two ends.Weigh the noise inhibiting ability of circuit, represent with CMRR:
Has only the Z of working as
1Level off to Z
2, and Z
3Level off to Z
4The time, e
12Level off to 0, CMRR is big more, and is strong more to capability of restraining noise.Latticed wiring of the present invention can make Z to greatest extent
1Level off to Z
2, and Z
3Level off to Z
4Among the figure, Z
1, Z
2The line impedance of expression from outer power supply source to the analog subscriber interface circuit, Z
3, Z
4Represent power line from the line impedance of analog subscriber interface circuit with respect to the earth, in the practical application, Z
1, Z
2Value approaching substantially, and Z
3, Z
4Value directly set type relevantly with wiring, when the latticed wiring of employing, can make Z
3, Z
4Very approaching, can make CMRR very big, noise inhibiting ability is just very strong.
Fig. 3 has illustrated the process that causes noise of ground wire common impedance, R
1The common ground line impedance, R
2Be the second branch road ground wire line impedance, ZA, ZB are that impedance is the load of Z, e
0Be signal source, work as e
0When being added on the ZA branch road separately, A point current potential is
Work as e
0When being added on the ZB branch road separately, B point current potential is
For test result, in ZA, the ZB impedance potential difference is just arranged
e
AB=e
B-e
AThereby cause in different positions and measure different values, be similar at diverse location and introduced different series mode interference noises.Work as R
2Leveled off to e at 0 o'clock
ABLevel off to 0, thereby guarantee the consistency of test.When adopting latticed wiring, can make R
1, R
2Level off to 0, thereby because the inaccurate and inconsistency of the test result that power circuit impedance difference causes drops to minimum.
Fig. 4,5 has illustrated under identical measurement environment, the total distortion index typical case survey map of wire bond composition the when GND in analog line circuit adopts the dendroid wiring and user interface.This moment is after having introduced stronger common mode noise signal from power supply, because the circuit board earth impedance degree of balance everywhere all is in similar defective mode, common mode noise signal is all compared responsive, be subject to the influence of power supply, thereby make the total distortion index of interface circuit and the relation of the position on the circuit board not very big, all be in defective state.
Fig. 6,7 has illustrated under identical measurement environment, the wire bond composition the when GND in analog line circuit adopts the wiring of series connection shape and the total distortion index measurement figure of user interface.This moment is owing to introduced stronger common mode noise signal from power supply, the total distortion index of interface circuit is more relevant with the position on the circuit board, the small-signal end can be along with the variation of the distance of porch and change, good more near the porch index more, appearance slowly is lifted to qualified process from defective, dotted line among Fig. 7 is away from the total distortion index of the small-signal part of the subscriber line circuit at power import place, solid line is the small-signal total distortion index partly of the subscriber line circuit at the most close power import place, and two curves have been incorporated into together during to large-signal.The total distortion index of the subscriber line circuit that the position mediates just is in the centre of solid line and dotted line.This is that the line longitudinal balance of subscriber line circuit is changing gradually, thereby the process of total distortion index gradual change occurs because of the variable in distance along with position and power import place.
Fig. 8,9 illustrated under identical measurement environment, the GND in analog line circuit ,+5V ,-wire bond composition when 5V adopts latticed wiring and the total distortion index measurement figure of user interface.After having introduced common mode noise signal with above-mentioned two kinds of situation same intensity from power supply this moment, because the power supply earth impedance degree of balance of each interface circuit is good, the line impedance equilibrium of each ground wire branch road, so the common mode noise signal of introducing is not easy to change into the series mode noise signal, anti-ground wire common impedance noiseproof feature is also better, the noise of introducing on the circuit is close to ignores, so be subjected to the influence of power environment and position during testing total distortion index hardly.(theory analysis is seen the detailed analysis to Fig. 2, Fig. 3).Two electric capacity among Fig. 9 in the frame of broken lines are filter capacitor, are mainly used to the series mode noise on the filter out power, and latticed wiring is played certain booster action.It can fall the noise filtering of also omitting after having taked latticed wiring, the antijamming capability of further intensifier circuit, and whether it needs to see the actual effect after cloth finishes line, if fine, just can not add.Facts have proved, adopt the method for netted wiring on offset ambient noise interference good effect to be arranged, can make the total distortion index relatively stable, result of the test and theory analysis match.
The present invention has tested enforcement, via the test on 32 road Analog Subscriber Line Boards of the digital SPC exchange of certain model, it forms the single circuit module array by 32 analog subscriber interface modules, it needs power supply to provide+5V,-5V, voltage kinds such as-48V, and each voltage all will be provided on each single circuit module.For improving the antijamming capability of complete machine, improve the total distortion index of user interface circuit, we are with more sensitive+5V,-5V, GND has carried out latticed wiring, has guaranteed the equilibrium of the power circuit impedance of entire plate, thereby disturbing particularly to power supply, common mode disturbances plays the good restraining effect, simultaneously, the impedance equalization of circuit has reduced the series mode noise signal of common impedance, has guaranteed the consistency of each single circuit modular character.By above-mentioned mesh cloth line method, 32 road analog interface performance index on this user plate can both keep basicly stable under not good power supply environment, and can both meet test request.The stability of total distortion index has reached satisfied degree, is better than the subscriber line circuit of not taking such measure far away.Generally change in the 2dBr scope after adopting the present invention, and will surpass 10dBr when not adopting.Can also add certain filter capacitor at the initiating terminal and the least significant end of grid in addition, then can also improve the ability of anti-power supply series mode noise simultaneously.Utilize identical method, we have also obtained identical good result to after having carried out the wiring improvement on some other Analog Subscriber Line Board.And the present invention to the applicable circuit of reality except require to divide form by the single circuit module, therefore other restrictive condition does not prove that method of the present invention and circuit structure have suitable generality and versatility.
Comprehensive top elaboration to the principle of the invention and embodiment, obviously can know that the scope of application of the present invention can be generalized to that those are relatively responsive to the power supply interference noise, and in the application of the circuit of forming by several single circuit modules, and the design example of not only limiting to analog subscriber circuit board in the communication apparatus.So the present invention has crucial meaning technically and economically, especially more there is higher using value in communication apparatus supplier.
Claims (5)
- The method for arranging of 1 one kinds of netted power supply wires is characterized in that, this method comprises the following steps:The first step is carried out Module Division to the formation of circuit;1) power supply the principle of each single circuit module of Hua Fening is identical, all arrays of modules combination structuresBecome complete circuit;2) do not list the required power source voltage kind of each single circuit module;In second step, circuit is carried out netted power supply wire respectively by the difference of supply voltage kind arrange;1) a kind of supply voltage of selecting wherein determines which single circuit module has this power supply to need in the circuitAsk;2) other have each the power line of the single circuit module of this power supply requirement to be arranged to a gridThe shape loop;3) power line of the bound fraction of the adjacent mesh loops in two positions being merged into an integral body walksLine;4) to other supply voltage kind in the circuit also respectively by as above 1) to 3) and steps in sequenceCarrying out netted power supply wire arranges;At last, the kind difference according to power supply is provided with inlet port at power import place separately respectively.
- The method for arranging of 2 netted power supply wires according to claim 1 is characterized in that: each single circuit module in the described first step all may be separately formed a power supply power supply loop.
- The circuit structure of 3 one kinds of netted power supply wires is characterized in that, this structure is by each single circuit module and be looped around around the single circuit module power line of various supply power voltages and form, and each single circuit module is powered by being looped around its power line all around respectively.
- The circuit structure of 4 netted power supply wires according to claim 3 is characterized in that: the described supply power voltage that is looped around the power line around the single circuit module be respectively by around the required voltage kind of single circuit module.
- The circuit structure of 5 netted power supply wires according to claim 3 is characterized in that: can add a filter capacitor respectively at the initiating terminal and the least significant end of integral grid wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00125623 CN1332534A (en) | 2000-09-29 | 2000-09-29 | Netted power supply wire configuration and circuit structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00125623 CN1332534A (en) | 2000-09-29 | 2000-09-29 | Netted power supply wire configuration and circuit structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294642C (en) * | 2002-08-21 | 2007-01-10 | 矽统科技股份有限公司 | Analysis methd of power supply random signal and its reducing method |
| CN103391408A (en) * | 2013-07-31 | 2013-11-13 | 北京思比科微电子技术股份有限公司 | Pixel structure of CMOS (complementary metal-oxide-semiconductor transistor) image sensor and image sensor |
| CN113792519A (en) * | 2021-11-18 | 2021-12-14 | 芯行纪科技有限公司 | Method for performing layout planning on circuit, electronic equipment and storage medium |
-
2000
- 2000-09-29 CN CN 00125623 patent/CN1332534A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1294642C (en) * | 2002-08-21 | 2007-01-10 | 矽统科技股份有限公司 | Analysis methd of power supply random signal and its reducing method |
| CN103391408A (en) * | 2013-07-31 | 2013-11-13 | 北京思比科微电子技术股份有限公司 | Pixel structure of CMOS (complementary metal-oxide-semiconductor transistor) image sensor and image sensor |
| CN103391408B (en) * | 2013-07-31 | 2017-02-15 | 北京思比科微电子技术股份有限公司 | Pixel structure of CMOS (complementary metal-oxide-semiconductor transistor) image sensor and image sensor |
| CN113792519A (en) * | 2021-11-18 | 2021-12-14 | 芯行纪科技有限公司 | Method for performing layout planning on circuit, electronic equipment and storage medium |
| CN113792519B (en) * | 2021-11-18 | 2022-02-11 | 芯行纪科技有限公司 | Method for performing layout planning on circuit, electronic equipment and storage medium |
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