CN1173373C - Improved structure for electrical property of twisted pair - Google Patents

Abstract

The present invention relates to a structure for improving the electrical property of a twisted pair, which comprises a plurality of twisted-pair type conducting wires which are tightly arrayed side by side, wherein a specific offset angle is formed between every pair of conducting wires and the adjacent conducting wires of the twisted pair along the direction of a longitudinal axis, disturbing signals on every conducting wire can be mutually counteracted, and induction signals of every disturbed conductor wires can be reduced; thus, the crosstalk of the long distance of a cable is reduced.

Description

Improved structure for electrical property of twisted pair

[technical field]

The invention relates to a kind of flat twisted pair construction, refer to a kind ofly whenever have 90 degree phase node in twos between the adjacent cables especially, and to offset the improved structure for electrical property of twisted pair of induced signal between cable.

[background technology]

The characteristic electron of existing pair cable line is better than the characteristic electron of complete flat line or cable, wherein every pair of insulated conductor twines mutually along the length of cable direction, and this twisted pair conductors can be disturbed the characteristic electron that produces low cross-talk and high noise immunity because of its external magnetic field.As Fig. 1 is United States Patent (USP) the 4th, 486, the first pair cable line of prior art shown in No. 619.

Second cable as shown in Figure 2, wherein each two pairs of adjacent lead inverse type twists together, twine from the right clockwise direction at its longitudinally on the 1st pair of top, and counterclockwise twine from the right at its longitudinally on the 2nd pair of top, and then twine from its lengthwise the right clockwise direction again on the 3rd pair of top.

The influence of balance electromagnetism is attempted in this change, reduces couple of conductor with expectation and disturbs because of the signal of being responded between the adjacent wires.In other words, twisted-pair feeder is fit to be applied in the interference that reduces cross-talk in the unlike signal, expects another identical inductive signal interference source because closely arrange each other between the cable, and in different application, this model identical will make induced signal obtain balance.The opposite polarity factor makes it reduce interference between the adjacent loop thereby whole electromagnetism field is thought.

Yet, be not as above-mentioned desired, when distance between adjacent two pairs of leads is enough big, just can reach the situation of above-mentioned non-interference, but this situation can not take place, and adjacent two pairs of leads are close proximity each other often, and the distance between adjacent two leads is too little, thereby the interference mutually can't be avoided, and therefore can not reach above-mentioned effect.

In fact, comparatively speaking, be closely aligned each other between the lead, every pair of separation approaches every pair of distance between the lead inside usually.In this case, it is right to influence adjacent lead in the every pair of lead.In other words, between distance between two twisted pair wires is than every group of twisted paired conductors distance more hour, the interference that it induced will be bigger, therefore cross-talk just produces.Its reason is as described below.

Shown in Fig. 3 A and Fig. 3 B, twisted pair wire same as described above is passed through the electric current between adjacent wires in section sometime, makes its long-range cross-talk unsettled accumulation may occur or cancels each other.The interference that the every pair of lead induces is most of just to be caused by the most close two-phase adjacency pair both sides.In a word, the every pair of sensor wire is right to the adjacent lead of meeting induction, however simultaneously it also will cause one of wherein adjacent right to influencing adjacent another.

As shown in Figure 3A, drive and to comprise lead 52,54 to 50, and uses-1V and+1V voltage respectively; Driving comprises lead 62 to 60,64, and respectively use-1V and+1V voltage, driving is subjected to induction to middle or a certainly be subjected to induction to both sides to generally being positioned at two pairs, be subjected to induction to comprise lead 72 and 74 to 70, be subjected to the electric current of sensor wire 72 to carry the induced signal that drives lead 54 generations around some 72A, and further carry by driving the induced signal that lead 64 produces around some 72B, and the signal that the signal that the former produces and the latter produce, to make driving lead 54 identical because of the sense of current is identical with 64 polarity, thereby electric current mutual superposition each other, in other words, lead 54 induces unidirectional electric current to 72A and 72B respectively with lead 64, and the current signal of a mutual superposition appears, and therefore will be in long-range appearance one high cross-talk phenomenon, other lead 74 is equally also followed above this mode.

Different is, if doing a change in addition, the current values of Fig. 3 B can produce different effects when being provided with, as lead 52 employing+1V voltages and among the alternate figures 3A-and 1V, lead 54 is employing-1V voltage and among the alternate figures 3A+1V then, and its effect will be different fully like this.In this case, for lead 72, this will be carried around 72A by driving the induced signal that lead 54 produces by the electric current of sensor wire 72, and further carry by driving the induced signal that lead 64 produces around some 72B, and the signal that the signal that the former produces and the latter produce, to cancel out each other to each other on the contrary mutually with 64 polarity because of driving lead 54, in other words, because the lead 54 and lead 64 senses of current are reverse, thereby respectively 72A and 72B being induced rightabout electric current, this electric current can be cancelled out each other.So the long-range P of cable lead 72 has low cross-talk, other lead 74 is followed above this mode too.

But when current in wire is non-direct current, then be not easy control, its magnitude of voltage on each second inside conductor by+1V to-1V alternately change repeatedly, and each lead numerical value also will be different in each particular moment.It is impossible a kind of lasting perpetual model being set in whole system shown in Figure 3, and therefore, the cross-talk uncontrollability of stranded formula cable remote is too high so that can not be accepted by people.

Recently, the people in the industry attempts to take different measure and method to reduce these induced signals, wherein take to insert decay or compensate for attenuation for reaching low cross-talk purpose, and each to lead in or between phase adjacency pair lead, irregular lead etc. is set, as United States Patent (USP) the 3rd, 736, No. 366 and 5,767, No. 446, but the lead group of the variation of various in any case differences or irregular alignment, corresponding assembly is not a scientific methods to changing design or making upward, the designer does not have strong confidence to constant product quality or on accurately making yet.Therefore, managing to seek a science, system, reliable and can expect the set-up mode of twisted-pair feeder, so that effectively lower the induction noise.

[summary of the invention]

The object of the present invention is to provide a kind of twisted-pair feeder, it has reliably, can expect and controllable set-up mode that this twisted-pair feeder not only can reduce cross-talk effectively, and can use the manufacture process with same procedure.

Electrical cable of the present invention comprises some to multiple twin formula lead, adjacent relatively another of wherein any couple of conductor twists along the longitudinal axis at a certain angle to multiple twin formula lead, in its spindle guide line each is subjected to sensor wire to be set at 0-360 degree torsional zones, when first lead and second lead have opposite polarity, 0-90 degree scope is first district, and first district one of drives in the lead lead by adjacent first pair to be induced; And 90-180 degree scope is second district simultaneously, and second district is induced by first pair of another lead that drives in the lead of phase adjacency pair, and therefore two offset to zero relatively by the mixing induced signal (cross-talk) of sensor wire.Simultaneously, for the identical same sensor wire that is subjected to lead, when privates and privates had opposite polarity, 180-270 degree scope was the 3rd district, and the 3rd district is induced by second pair of privates that drives in the lead of another phase adjacency pair; And simultaneously 270-360 degree scope is the 4th district, and the 4th district is induced by second pair of wherein another privates that drive in the lead of another identical phase adjacency pair, therefore two this be subjected to sensor wire mixings induced signal counteracting be extremely zero relatively; The original position difference of adjacent two pairs of leads distortion produces 90 phase pushing figures of spending, and makes distance between two points increasing recently on the phase adjacency pair lead, reduces the interference signal that is subjected to interfere with guidewire.

By technique scheme, the present invention reverse in the race way in each of 0-360 degree scope each be subjected to sensor wire, its interference signal can be cancelled out each other, and can reduce the induced signal that each is subjected to interfere with guidewire, thereby reduces the cross-talk of cable remote.

In conjunction with the embodiments the present invention is further described with reference to the accompanying drawings.

[description of drawings]

Fig. 1 is the plane graph of existing twisted-pair cable, and all leads of this twisted-pair feeder are to reversing along the longitudinal axis with equidirectional;

Fig. 2 is the plane graph of existing twisted-pair cable, and this twisted-pair feeder adjacent wires is to reversing in the opposite direction along the longitudinal axis; The three-dimensional combination figure of existing connector of planar lattice array and wafer module.

Fig. 3 A is a twisted-pair feeder simplified plan view shown in Figure 2, wherein go up the adjacent driven lead to following adjacent driven lead to having identical numerical model, so that the high cross-talk effect of the long-range generation of cable;

Fig. 3 B is a twisted-pair feeder simplified plan view shown in Figure 2, wherein go up adjacent wires to following adjacent driven lead to having opposite numerical model, so that cable remote produces low cross-talk effect.

Fig. 4 is the simplified plan view that is easy to set forth improved structure for electrical property of twisted pair of the present invention, and the distortion phase place of wherein adjacent two pairs of leads is roughly at a distance of 90 degree.

Fig. 5 is a graph of relation between long-range mixing induced signal of cable and the angular deflection scope.

Fig. 6 is the simplified plan view of another embodiment of the present invention improved structure for electrical property of twisted pair, and it has the difformity domain transformation;

Fig. 7 is the simplified plan view of further embodiment of this invention improved structure for electrical property of twisted pair, and its every adjacent two pairs of leads have the identical phase place of reversing, and is different from the phase place of reversing of the in addition two pair leads adjacent with these two pairs of leads.

[embodiment]

See also Fig. 4, twisted-pair feeder 10 of the present invention comprises some to lead, and wherein each has opposite polarity to lead.As can be seen from Figure 4, each adjacent two pairs of lead twists in the opposite direction along the longitudinal axis, and for example, if a pair of distortion in a clockwise direction, another is to then twisting with counter clockwise direction.Hence one can see that, although Fig. 4 is similar to the mode of 3A and Fig. 3 B a bit, but each two distortion lead to the distortion lead appears the lead y direction along this peak district (as top), paddy district (as the bottom) and insertion district (as node), but it should be noted that three viewpoints of lead full-size(d) go to see to be identical, because this is to rotate along axis in the space to lead.For ease of setting forth, on this plan view, only show two sizes.

Therefore, be subjected to sensor wire that the first couple of 26 is subjected to sensor wire 22, at each circulation time, it first is subjected to sensor wire 22 to be subjected to sensor wire 24 spend to reverse mutually by 0 around second to be back to 360 and to spend (spending as 0), the phase place that is equivalent to 360 degree, when driving lead 32 and 34 is under the situation of opposite polarity, at (as the P1-P2) of 0-90 degree scope regional 25 nationalitys by the adjacent driven of lead to 36 driving lead 32 influences, and in the zone 26 of 90-180 degree scope (as P2-P3) by the identical adjacent driven of lead to 36 driving lead 34 influences.Therefore the induced signal that is added on the zone 25 and 26 is cancelled each other haply, causes mixing induced signal (as cross-talk) to approach zero.

Similarly, for the identical sensor wire 22 that is subjected to, when driving lead 42 and 44 tool opposite polarities, in the zone 27 of 180-270 degree scope (as P3-P4) by the influence of another adjacent driven of lead to 46 driving lead 42, in the zone 28 of 270-360 degree scope (as P4-P5) then by the identical driving of lead to 46 another drive lead 44 influences.Therefore, mix induced signal and approach zero.Because zone 25 and 26 (as P1-P3) approach zero in conjunction with induced signal, and zone 27 and 28 (as P3-P5) also approach zero in conjunction with induced signal, therefore zone 25,26,27 and 28 (as P1-P5's) all idealized constantly approaches zero in conjunction with induced signal at each.Because formed for circulation continuously by sensor wire 23, and each circulation has with very low induced signal value, and the cross-talk of lead 22 long-range P is the accumulating value after these circulations, so also can reach a very low numerical value.

Identical pattern is applicable to that also another is subjected to sensor wire 24, and produces identical effect.Therefore, the distortion of lead induction will be very low in long-range whole cross-talk value to 26.The long-range cross-talk value of corresponding cable 10 is also by after all paired lead numerical value COMPREHENSIVE CALCULATING, so also can reach a very low numerical value.

Different is the prior art that should attention discloses with 3A and 3B figure, it can not be in expection because of driving right induced signal, might drive producing decay or reduction by another, the present invention is because of driving the induced signal that induces on the zone 25 (27) 36 (46), can produce 26 (28) influence of another root lead on 36 (46) by identical driving and decay, the cross-talk of cable remote P is reduced to minimum value reliably with system.

Because the difference of distortion phasetophase distance has now between twisted-pair feeder two adjacent leads right nearest 2 A, B (icon 3A and 3B) apart from D ₁, this distance D ₁Reduce (leaning on nearest mutually) in same lateral location, and be positioned on the identical plane, but it can be set up distance D as shown in Figure 4 in the present invention ₂, this distance D ₂Be the distance between two closest approach A ' and B ', be positioned on the identical plane but not be positioned at same lateral location.Because of its inversely proportional relation, also will reduce the induced signal value simultaneously widely when increasing this distance.Equally, opposite side point B " non-in the same plane with some A, but will be bigger compared to A point spacing between the B point.

Each is arranged side by side to lead, is followed successively by the 1st, 2,3,4,5 pair.Although originally execute the distortion phasetophase distance of setting 90 degree in the example, all odd numbers comprise that to lead distortion phase place and direction of twist all are provided with in mutually the same mode, all even-even leads comprise that distortion phase place and the also mutually the same mode of direction of twist are provided with, other variation also can be used, as twist phasetophase apart from may be in a scope and replace particular value, as 90 degree.But odd number can not need all model identical to be consistent with the manufacturing machine to lead.

Therefore, Fig. 5 has disclosed the relation between distortion phase place spacing range and cable remote cross-talk, is optimum efficiency during 90 degree spacing phase angles wherein.That is, when the phase pushing figure of adjacent two pairs of leads differ into lead from four/for the moment of a circulation of 0-360 degree, can reach optimum efficiency.

Twisted-pair feeder is made up of the flat zone 80 (connector that is used for the termination correspondence) and the distortion district 82 of conversion.For preventing that the present invention from tilt phenomenon (seven not only nearly transmission ranges 84 that are arranged in 82 in flat zone 80 and distortion district are disclosed in Fig. 4) occurring because of spaced apart is set, also disclose the transmission range 84 ' of another pattern among Fig. 6, it combines in distortion district 82, to reduce tilt phenomenon.Can find out also that from Fig. 4 the flat zone 84 among Fig. 4 keeps equating with flat zone 80, and the transmission range 84 ' among Fig. 6 keeps equating with distortion district 82.In any case, two transmission ranges all can make lead be smooth to independent shapes from flat zone to the distortion district.

In addition, Fig. 7 discloses another kind of twisted-pair feeder, and wherein for ease of making, adjacent two pairs of lead direction of twists are identical, but the other two pair leads adjacent with these two pairs of leads have the phase pushing figure of 90 degree.Hence one can see that, and cable performance shown in Figure 7 is worse than the cable performance shown in Fig. 4.

Thus our same deducibility go out this cable 10 long-range P forwardly the decay of cross-talk can derive cable 10 near holding cross-talk also to obtain decaying after the end Q because of same reason.

Claims (2)

1. improved structure for electrical property of twisted pair, comprise: some leads closely mutual and registration, each is provided with two pairs of adjacent leads to lead in its both sides, and each twists along y direction each other mutually to lead, each lead of every pair of lead is defined in the 0-360 degree race way of equal length in distort process, it is characterized in that: the distortion phase pushing figure between at least two pairs of adjacent wires remains at 90 degree.

2. improved structure for electrical property of twisted pair as claimed in claim 1, it is characterized in that: each lead is to being arranged side by side, be followed successively by the 1st, 2,3,4... is right, and the odd number lead is to having identical distortion phase place each other, the even number lead is to having another identical distortion phase place each other.

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