CN102486951A - Signal transmission cable - Google Patents
Signal transmission cable Download PDFInfo
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- CN102486951A CN102486951A CN2010105684184A CN201010568418A CN102486951A CN 102486951 A CN102486951 A CN 102486951A CN 2010105684184 A CN2010105684184 A CN 2010105684184A CN 201010568418 A CN201010568418 A CN 201010568418A CN 102486951 A CN102486951 A CN 102486951A
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- signal transmission
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Abstract
The invention relates to a signal transmission cable, comprising conducting rubber cloth, earthing conductors, a plurality of first-layer insulated conductors and a plurality of second-layer insulated conductors, wherein the first-layer insulated conductors are used for transmitting voltage signals; and the second-layer insulated conductors are used for transmitting a voltage source. The first-layer insulated conductors are firstly arranged on the conducting rubber cloth at equal intervals and in pairs, the earthing conductors are embedded between the paired signal conductors so as to stabilize impedance, then the conducting rubber cloth separates the first-layer insulated conductors from the second-layer insulated conductors so as to damage the noise coupling effect between the layers, and finally the conducting rubber cloth coats outside the first layer and the second layer to control the impedance and maintain the signal energy into the cable.
Description
Technical field
The invention relates to a kind of signal transmission cable, and particularly relevant for a kind of signal transmission cable that reduces coupling noise and impedance variation.
Background technology
When the modelled signal transmission yarn, anti electromagnetic wave disturb (Electro magnetic interference, EMI) and impedance matching (Impedance match) be two factors that must consider.The anti-system method of Electromagnetic Interference can be through clad metal aluminium foil or metal braid in the periphery of the insulating barrier of lead; Electromagnetic energy and signal are maintained in the cable; And, use and reduce the interference that signal radiation caused so that high-frequency signal return path over the ground to be provided.The transmission means of differential wave at present commonly used reduces the common-mode noise between transmitting terminal and the receiving terminal.
Traditional transmission yarn uses the structure of Shu Yuanzhuan (Circle) or flat (flat) usually.Yet it is wayward that the insulated conductor that coats with Shu Yuanzhuan causes impedance to make a variation because of power line and holding wire twine each other.In addition, with the insulated conductor that flat coats, though the problem that non-transformer line and holding wire twine each other, the problem of coupling noise still can produce between power line and the holding wire, remains further to be improved.
Summary of the invention
The invention relates to a kind of signal transmission cable, adopt double-deck repeatedly structure mode, use the problem that reduces coupling noise and impedance variation, make that the transmission of signal is more stable and more be difficult for giving off cable.
According to an aspect of the present invention, propose a kind of signal transmission cable, comprising: a conductive tape, several first insulated conductors and several second insulated conductors.Conductive tape is rolled into an inner conducting layer and an outer conducting layer.Several first insulated conductors are arranged side by side each other, and smooth on inner conducting layer, and these a little first insulated conductors are in order to transmit a winding earth signal and one group of voltage signal.Several second insulated conductors are arranged side by side each other, and smooth on outer conducting layer, and these a little second insulated conductors are in order to provide one group of power supply.This group power supply is organized voltage signal therewith and is isolated by inner conducting layer.Wherein, a little therewith second insulated conductors of these a little first insulated conductors change up and down mutually, and these a little first and second insulated conductor equidistance are arranged in the outer conducting layer.
For there is better understanding above-mentioned and other aspect of the present invention, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
The signal transmission cable that Fig. 1 illustrates present embodiment is connected in the sketch map between transmitting terminal and the receiving terminal.
Fig. 2 illustrates the generalized section of the signal transmission wire of present embodiment along the A-A line.
Fig. 3 illustrates the resistance value and the experimental data figure of the signal transmission cable of present embodiment.
[main element label declaration]
10: transmitting terminal 12,22: operational amplifier
20: receiving terminal DOUT+, DOUT-: output
RIN+: positive input terminal RIN-: negative input end
ROUT: differential output end R: terminal impedance
100: signal transmission cable 110: conductive tape
112: inner conducting layer 114: outer conducting layer
114a, 114b: upper strata, 120: the first insulated conductors of lower floor
122: signal conductor 122a, 122b: the differential-pair signal lead
124: earth lead 126a: insulating barrier
126b: multicore bare wire 128: single core bare wire
130: the second insulated conductor VDD: positive supply
VSS: negative supply D: distance
Embodiment
The signal transmission cable that present embodiment disclosed is in order to connect a circuit.This circuit has a characteristic impedance, and the characteristic impedance of the characteristic impedance of signal transmission cable and circuit is complementary, and is reflected back to transmitting terminal to avoid part signal, and produces reflection loss (return loss) or insert loss (insertion loss).Please refer to Fig. 1, its signal transmission cable that illustrates present embodiment is connected in the sketch map between transmitting terminal and the receiving terminal.Transmitting terminal 10 has an operational amplifier 12, and it has two output DOUT+ and DOUT-, in order to produce one group of voltage signal.Voltage signal is sent to receiving terminal 20 with differential right mode by transmitting terminal 10.In addition, receiving terminal 20 has an operational amplifier 22, in order to receive voltage signal.In the present embodiment, the circuit that receiving terminal 20 rears are coupled for example is liquid crystal display drive circuit (not illustrating), in order to the voltage signal that reception has a work amount, uses the inner picture element transistor of driving liquid crystal device, and makes its normal operation.
In Fig. 1; The operational amplifier 22 of receiving terminal 20 has first input end RIN+, the second input RIN-and output ROUT; First input end RIN+ is in order to receive differential positive voltage signal; The second input RIN-is in order to receive differential negative voltage signal, and output ROUT sees the difference signal of RIN+ with respect to RIN-off.In addition, an equivalent characteristic impedance R is arranged between the first input end RI N+ and the second input RIN-, the size of characteristic impedance R for example is 100 ohm.
Above-mentioned transmission means can be used for Low Voltage Differential Signal (Low-Voltage Differential Signaling; LVDS) on the circuit of transmission; Use the radiation that reduces common-mode noise between transmitting terminal 10 and the receiving terminal 20; And the current potential when making signal be transferred to receiving terminal 20 by transmitting terminal 10 is consistent, to avoid the noise jamming transmission signals.
Please be simultaneously with reference to figure 1 and 2, wherein Fig. 2 illustrates the generalized section of the signal transmission wire of present embodiment along the A-A line.Signal transmission cable 100 comprises a conductive tape 110, several first insulated conductors 120 and several second insulated conductors 130.Conductive tape 110 is rolled into an inner conducting layer 112 and an outer conducting layer 114, and wherein a side of inner conducting layer 112 for example has the conduction viscose, so that first insulated conductor 120 can be smooth on inner conducting layer 112.In addition, a side of outer conducting layer 114 for example has the conduction viscose, so that second insulated conductor 130 can be smooth on outer conducting layer 114.
In the present embodiment, conductive tape 110 is for example for including the conductive fabric of conductive fiber, or the conductive fabric of being made with electric conducting materials such as Copper Foil, aluminium foils.Conductive tape 110 has stickiness and pliability, and it can be coated on the periphery of second insulated conductor 130 of periphery and flat of first insulated conductor 120 of flat through repeatedly tying circle respectively.For example; When carrying out tying circle the first time; Earlier in the first's (being inner conducting layer 112) with most bar first insulated conductor 120 smooth ground conductive tapes 110; Then, upset is attached at first insulated conductor 120 in first's (inner conducting layer 112), makes on its smooth second portion in conductive tape 110 (being the upper strata 114a of outer conducting layer 114); Afterwards; On the third part (being the 114b of lower floor of outer conducting layer 114) that many second insulated conductors 130 smoothly are not used; Then; Upset is attached at second insulated conductor 130 on the second portion or is attached at first insulated conductor 120 of third part, makes first insulated conductor 120 and second insulated conductor 130 repeatedly constitute one with the mode of bilayer.Wherein, isolated between first insulated conductor 120 and second insulated conductor 130 with inner conducting layer 112, and be coated on jointly in the outer conducting layer 114, to accomplish bundle circle for the second time, as shown in Figure 2.
Therefore, present embodiment can be accomplished the inner conducting layer 112 of a circle and the outer conducting layer 114 of a circle through single conductive tape 110, to save the consumption of conductive tape 110.In another embodiment, the adhesive tape that conductive tape 110 can also two separation is made inner conducting layer 112 and outer conducting layer 114.Therefore, the present invention does not limit the above embodiments.
In addition, smooth first insulated conductor 120 on inner conducting layer 112 is arranged side by side each other, is flat, in order to provide a ground connection with reference to accurate position and one group of voltage signal.Voltage signal for example is a differential-pair signal.In addition, smooth second insulated conductor 130 on outer conducting layer 114 is arranged side by side each other, is flat, in order to one group of power supply to be provided.Because first insulated conductor 120 changes up and down with second insulated conductor 130 mutually, so lateral dimension dwindles relatively.Moreover the voltage signal of first insulated conductor 120 and being isolated by inner conducting layer 112 of second insulated conductor 130 that passes through the below through the top so can reduce power supply noise coupling (Power noise coupling), make that the transmission of signal is more stable.
As shown in Figure 2; Signal transmission cable 100 with four passages and three earth leads 124 is an example; Each channel has one group of signal conductor 122; For example be differential- pair signal lead 122a and 122b, to signal, transmit and the function that receives so that each passage can be carried out simultaneously in order to transmission differential.In addition; Be separated by with an earth lead 124 between the signal conductor 122 of channel; Therefore conductive tape 110 and 124 coatings of an earth lead of all being grounded usefulness on every side of each passage; Reduce coupling noise, make that the signal noise ratio (Signal/Noise ratio) in each channel can improve, quality of signals is more stable, and impedance is difficult for variation.
In the present embodiment, signal conductor 122 for example is the multicore insulated conductor, and it comprises an insulating barrier 126a and is coated on many bare wire 126b in the insulating barrier 126a.In addition, earth lead 124 for example is that single core bare wire 128 of naked layer is twisted into.In impedance matching, signal conductor 122 (for example the Teflon line coats with Teflon insulated hull (red, black, indigo plant, green)) all is consistent with respect to the inner conducting layer 112 of periphery and the distance B of outer conducting layer 114.Because the characteristic impedance of each group signal conductor 122 is proportionate with distance B with respect to conductive tape 110 haply,, be easier to control so the impedance during the signal transmission can maintain in certain scope (as shown in Figure 3).In one embodiment, the characteristic impedance of each group signal conductor 122 and the characteristic impedance R (for example 100 ohm) of receiving terminal circuit are complementary, to reduce reflection loss or to insert loss.
Please be simultaneously with reference to the 1st and 3 figure, wherein Fig. 3 illustrates the resistance value and the experimental data figure of the signal transmission cable of present embodiment.When signal was transferred to receiving terminal 20 by transmitting terminal 10, the maximum impedance of signal transmission cable 100 was 100.5 ohm, and minimum impedance is 98.4 ohm, and average impedance is 99.5 ohm (being generally positive and negative 15 ohm), and the amount of variability of impedance is little, was easier to control.Therefore, the characteristic impedance of the signal transmission cable 100 of present embodiment and the characteristic impedance R of receiving terminal circuit (for example 100 ohm) are complementary, so can effectively reduce reflection loss or insert loss.
Though the signal transmission cable of the foregoing description is to be example with Low Voltage Differential Signal (LVDS) cable; But the present invention is not limited to this; As long as, all be covered by in the scope of the present invention with change signal transmission cable that the structure mode arranges and add electric conducting material at layer and interlayer and destroy coupling effect and reach and stablize impedance of bilayer.
In sum, the signal transmission cable that present embodiment disclosed is to utilize double-deck repeatedly structure mode, uses the problem that reduces coupling noise and overcome the impedance variation, makes that the transmission of signal is more stable, and has following characteristics:
(1) lateral dimension of transmission signals cable can significantly reduce, and is about 3.85mm, much smaller than the lateral dimension (12mm) of traditional flat signal transmission cable.In addition, the longitudinal size of transmission signals cable is about 1.3mm, also less than the longitudinal size (3.5mm) of traditional Shu Yuanzhuan signal transmission cable.
(2) variation of characteristic impedance is little, and the problem of twining each other can not take place for power line and holding wire layering.
(3) reduce insertion loss, reflection loss and raising signal transmitting speed and stability.
(4) conductive tape has the effect of inside and outside double layer screen, can reduce the influence that signal conductor receives voltage noise coupling and Electromagnetic Interference.
In sum, though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under the present invention, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.Therefore, protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (10)
1. signal transmission cable comprises:
One conductive tape is rolled into an inner conducting layer and an outer conducting layer;
Many first insulated conductors are arranged side by side each other, and smooth on this inner conducting layer, and these many first insulated conductors are in order to transmit a winding earth signal and one group of voltage signal; And
Many second insulated conductors are arranged side by side each other, and smooth on this outer conducting layer, and these many second insulated conductors are in order to transmit one group of voltage source, and this group voltage source and this group voltage signal are isolated by this inner conducting layer;
Wherein, these many first insulated conductors change up and down with these many second insulated conductors mutually, and these many first and second insulated conductor equidistance are arranged in this outer conducting layer.
2. signal transmission cable according to claim 1, wherein these many first insulated conductors comprise at least one earth lead and organize signal conductor more, respectively this earth lead is between these many group signal conductors.
3. signal transmission cable according to claim 2, wherein respectively this earth lead comprises single condctor.
4. signal transmission cable according to claim 2, wherein respectively this group signal conductor comprises the multicore insulated conductor.
5. signal transmission cable according to claim 2, wherein respectively this group signal conductor comprises a differential-pair signal lead.
6. signal transmission cable according to claim 1, wherein this group voltage signal comprises a differential-pair signal.
7. signal transmission cable according to claim 1, wherein this group voltage source comprises one group of positive voltage and one group of negative voltage.
8. signal transmission cable according to claim 1, in order to connect a circuit, this circuit has a characteristic impedance, and wherein respectively the characteristic impedance of this first insulated conductor and this characteristic impedance are complementary.
9. signal transmission cable according to claim 1, wherein respectively this first insulated conductor is consistent with respect to the distance of this inner conducting layer and this outer conducting layer.
10. signal transmission cable according to claim 1, wherein this signal transmission cable comprises the Low Voltage Differential Signal cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105684184A CN102486951A (en) | 2010-12-01 | 2010-12-01 | Signal transmission cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105684184A CN102486951A (en) | 2010-12-01 | 2010-12-01 | Signal transmission cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102486951A true CN102486951A (en) | 2012-06-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105684184A Pending CN102486951A (en) | 2010-12-01 | 2010-12-01 | Signal transmission cable |
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| CN (1) | CN102486951A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971794A (en) * | 2014-04-24 | 2014-08-06 | 安徽徽宁电器仪表集团有限公司 | Flat integrated cable |
| TWI572114B (en) * | 2015-12-23 | 2017-02-21 | The cable and the battery module using the cable are fully balanced | |
| CN109256236A (en) * | 2017-07-13 | 2019-01-22 | 富士康(昆山)电脑接插件有限公司 | Cable and micro coaxial cable connector assembly |
| CN112020794A (en) * | 2019-03-29 | 2020-12-01 | 法国圣戈班玻璃厂 | Antenna plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409427A (en) * | 1981-11-30 | 1983-10-11 | Plummer Iii Walter A | Radio frequency shielding jacket for multiple ribbon cables |
| US4800236A (en) * | 1986-08-04 | 1989-01-24 | E. I. Du Pont De Nemours And Company | Cable having a corrugated septum |
| CN2616010Y (en) * | 2003-03-14 | 2004-05-12 | 黎文玉 | Anti-electromagnetic wave coating structure improvement for flexible cables |
| CN101127257A (en) * | 2006-07-19 | 2008-02-20 | 住友电气工业株式会社 | Flexible flat cable |
| CN101494096A (en) * | 2008-01-25 | 2009-07-29 | 莱尔德电子材料(深圳)有限公司 | Shielding flat flexible cable |
-
2010
- 2010-12-01 CN CN2010105684184A patent/CN102486951A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409427A (en) * | 1981-11-30 | 1983-10-11 | Plummer Iii Walter A | Radio frequency shielding jacket for multiple ribbon cables |
| US4800236A (en) * | 1986-08-04 | 1989-01-24 | E. I. Du Pont De Nemours And Company | Cable having a corrugated septum |
| CN2616010Y (en) * | 2003-03-14 | 2004-05-12 | 黎文玉 | Anti-electromagnetic wave coating structure improvement for flexible cables |
| CN101127257A (en) * | 2006-07-19 | 2008-02-20 | 住友电气工业株式会社 | Flexible flat cable |
| CN101494096A (en) * | 2008-01-25 | 2009-07-29 | 莱尔德电子材料(深圳)有限公司 | Shielding flat flexible cable |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971794A (en) * | 2014-04-24 | 2014-08-06 | 安徽徽宁电器仪表集团有限公司 | Flat integrated cable |
| TWI572114B (en) * | 2015-12-23 | 2017-02-21 | The cable and the battery module using the cable are fully balanced | |
| CN109256236A (en) * | 2017-07-13 | 2019-01-22 | 富士康(昆山)电脑接插件有限公司 | Cable and micro coaxial cable connector assembly |
| CN109256236B (en) * | 2017-07-13 | 2021-06-18 | 富士康(昆山)电脑接插件有限公司 | Cable and cable connector assembly |
| CN112020794A (en) * | 2019-03-29 | 2020-12-01 | 法国圣戈班玻璃厂 | Antenna plate |
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Application publication date: 20120606 |