CN105916287A - Backboard - Google Patents
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- CN105916287A CN105916287A CN201610326237.8A CN201610326237A CN105916287A CN 105916287 A CN105916287 A CN 105916287A CN 201610326237 A CN201610326237 A CN 201610326237A CN 105916287 A CN105916287 A CN 105916287A
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Abstract
本发明公开了一种背板，背板上设置有差分线，差分线包括正差分线和负差分线，正差分线的两端与负差分线的两端分别对应设置，正差分线的发送侧设置有N1个回流地孔，正差分线的接收侧设置有N2个回流地孔，负差分线的发送侧设置有M1个回流地孔，负差分线的接收侧设置有M2个回流地孔；设置于正差分线的发送侧的N1个回流地孔以及设置于负差分线的发送侧的M1个回流地孔使差分线上传输的差分信号产生的第一电压偏差，与设置于正差分线的接收侧的N2个回流地孔以及设置于负差分线的接收侧的M2个回流地孔使差分信号产生的第二电压偏差相互抵消。本发明能够使差分线两侧的电压幅值保持平衡，避免差分线传输的差分信号的幅度发生扭曲，保证差分信号的完整性。
The invention discloses a backplane. A differential line is arranged on the backplane. The differential line includes a positive differential line and a negative differential line. There are N1 return holes on one side, N2 return holes on the receiving side of the positive differential line, M1 return holes on the sending side of the negative differential line, and M2 return holes on the receiving side of the negative differential line ; The N1 backflow ground holes arranged on the sending side of the positive differential line and the M1 backflow ground holes arranged on the sending side of the negative differential line make the first voltage deviation generated by the differential signal transmitted on the differential line different from that set on the positive differential line The N2 return ground holes on the receiving side of the line and the M2 return ground holes disposed on the receiving side of the negative differential line cancel each other out the second voltage deviation generated by the differential signal. The invention can keep the voltage amplitude on both sides of the differential line balanced, avoid distortion of the amplitude of the differential signal transmitted by the differential line, and ensure the integrity of the differential signal.
Description
技术领域technical field
本发明涉及信号传输技术领域，特别是涉及一种背板。The invention relates to the technical field of signal transmission, in particular to a backplane.
背景技术Background technique
随着信号速率的提高，信号的完整性在信号有效传输中所占的位置越来越重要，其中，信号的完整性是指信号在传输路径上的质量。目前的信号传输中的一类常见信号为差分信号，差分信号由一对差分线来传输，传输差分信号的差分线设置于背板上，由于背板为多层结构，为了保证信号的一贯性，需要在各层上设置回流地孔来作为接地端。With the increase of the signal rate, the signal integrity plays an increasingly important role in the effective transmission of the signal. The signal integrity refers to the quality of the signal on the transmission path. A common type of signal in the current signal transmission is the differential signal. The differential signal is transmitted by a pair of differential lines. The differential line for transmitting the differential signal is set on the backplane. , It is necessary to set the return ground hole on each layer as the ground terminal.
由于在差分线的两侧往往需要设置回流地孔，而现有的回流地孔的设置方式不够合理，常常会导致阻抗失配，使差分信号的传输质量差，影响差分信号的完整性，且这种情况对差分信号的影响随着信号速率的提高表现的越为明显。Since it is often necessary to set return ground holes on both sides of the differential line, and the existing way of setting the return ground holes is not reasonable enough, it often leads to impedance mismatch, which makes the transmission quality of the differential signal poor and affects the integrity of the differential signal, and The effect of this situation on the differential signal becomes more obvious as the signal rate increases.
因此，如何解决由于差分线两侧回流地孔的设置不合理而影响差分信号完整性的问题是本领域技术人员目前需要解决的问题。Therefore, how to solve the problem of affecting the integrity of the differential signal due to the unreasonable setting of the return ground holes on both sides of the differential line is a problem that those skilled in the art need to solve.
发明内容Contents of the invention
本发明的目的是提供一种背板，其上差分线的两侧设置的若干个回流地孔能够使差分线两侧的电压幅值保持平衡，避免差分线上传输的差分信号的幅度发生扭曲，保证差分信号的完整性，差分信号的传输质量好。The purpose of the present invention is to provide a backplane on which several return ground holes arranged on both sides of the differential line can keep the voltage amplitudes on both sides of the differential line balanced and avoid distortion of the amplitude of the differential signal transmitted on the differential line , to ensure the integrity of the differential signal, and the transmission quality of the differential signal is good.
为解决上述技术问题，本发明提供了一种背板，所述背板上设置有差分线，所述差分线包括正差分线以及负差分线，所述正差分线的两端与所述负差分线的两端分别对应设置，其中：In order to solve the above technical problems, the present invention provides a backplane, the backplane is provided with a differential line, the differential line includes a positive differential line and a negative differential line, the two ends of the positive differential line and the negative The two ends of the differential line are respectively set correspondingly, where:
所述正差分线的发送侧设置有N1个回流地孔，所述正差分线的接收侧设置有N2个所述回流地孔，所述负差分线的发送侧设置有M1个所述回流地孔，所述负差分线的接收侧设置有M2个所述回流地孔；The sending side of the positive differential line is provided with N1 return ground holes, the receiving side of the positive differential line is provided with N2 return ground holes, and the sending side of the negative differential line is provided with M1 return ground holes. holes, the receiving side of the negative differential line is provided with M2 return ground holes;
其中，设置于所述正差分线的发送侧的N1个所述回流地孔以及设置于所述负差分线的发送侧的M1个所述回流地孔使所述差分线上传输的差分信号产生的第一电压偏差，与设置于所述正差分线的接收侧的N2个所述回流地孔以及设置于所述负差分线的接收侧的M2个所述回流地孔使所述差分信号产生的第二电压偏差相互抵消。Wherein, the N1 return holes arranged on the sending side of the positive differential line and the M1 return holes arranged on the sending side of the negative differential line make the differential signal transmitted on the differential line generate The first voltage deviation, and the N2 return ground holes set on the receiving side of the positive differential line and the M2 return ground holes set on the receiving side of the negative differential line make the differential signal generate The second voltage deviations cancel each other out.
优选地，设置于所述正差分线的发送侧的N1个所述回流地孔距离所述正差分线的发送端的长度以及设置于所述正差分线的接收侧的N2个所述回流地孔距离所述正差分线的接收端的长度均不大于预设距离；Preferably, the length of the N1 return ground holes set on the sending side of the positive differential line from the sending end of the positive differential line and the N2 return ground holes set on the receiving side of the positive differential line The distance from the receiving end of the positive differential line is no greater than a preset distance;
设置于所述负差分线的发送侧的M1个所述回流地孔距离所述差分线的发送端的长度以及设置于所述负差分线的接收侧的M2个所述回流地孔距离所述差分线的接收端的长度均不大于所述预设距离。The distance between the M1 return holes arranged on the sending side of the negative differential line and the distance from the sending end of the differential line and the distance between the M2 return holes arranged on the receiving side of the negative differential line The lengths of the receiving ends of the wires are not greater than the preset distance.
优选地，所述预设距离为36mil。Preferably, the preset distance is 36mil.
优选地，N1与M2相等，N2与M1相等。Preferably, N1 is equal to M2, and N2 is equal to M1.
优选地，N1与M1相等，N2与M2相等。Preferably, N1 is equal to M1, and N2 is equal to M2.
优选地，N1与N2相等。Preferably, N1 and N2 are equal.
本发明提供了一种背板，该背板上的差分线的两侧设置的回流地孔能够使差分线上传输的差分信号在发送侧产生的第一电压偏差与在接收侧产生的第二电压偏差相互抵消，即本发明的背板上设置的回流地孔的个数能够使差分线两侧的电压幅值保持平衡，避免了差分线上传输的差分信号的幅度发生扭曲，保证了差分信号的完整性，差分信号的传输质量好。The present invention provides a backplane, and the backflow ground holes provided on both sides of the differential line on the backplane can make the first voltage deviation generated on the sending side and the second voltage deviation generated on the receiving side of the differential signal transmitted on the differential line The voltage deviations cancel each other out, that is, the number of return ground holes set on the backplane of the present invention can keep the voltage amplitudes on both sides of the differential line in balance, avoiding distortion of the amplitude of the differential signal transmitted on the differential line, and ensuring differential The integrity of the signal, the transmission quality of the differential signal is good.
附图说明Description of drawings
为了更清楚地说明本发明实施例中的技术方案，下面将对现有技术和实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.
图1为本发明提供的一种背板上设置的回流地孔的位置示意图；Fig. 1 is a schematic diagram of the position of the backflow hole provided on a backboard provided by the present invention;
图2为本发明提供的另一种背板上设置的回流地孔的位置示意图；Fig. 2 is a schematic diagram of the position of another backflow ground hole provided on the backplane provided by the present invention;
图3为本发明提供的另一种背板上设置的回流地孔的位置示意图。Fig. 3 is a schematic diagram of the position of another backflow hole provided on the backplane provided by the present invention.
具体实施方式detailed description
本发明的核心是提供一种背板，其上差分线的两侧设置的若干个回流地孔能够使差分线两侧的电压幅值保持平衡，避免差分线上传输的差分信号的幅度发生扭曲，保证差分信号的完整性，差分信号的传输质量好。The core of the present invention is to provide a backplane on which a number of backflow ground holes arranged on both sides of the differential line can keep the voltage amplitudes on both sides of the differential line balanced and avoid distortion of the amplitude of the differential signal transmitted on the differential line , to ensure the integrity of the differential signal, and the transmission quality of the differential signal is good.
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
本发明提供了一种背板，背板上设置有差分线，差分线包括正差分线以及负差分线，正差分线的两端与负差分线的两端分别对应设置，其中：The present invention provides a backplane. A differential line is arranged on the backplane. The differential line includes a positive differential line and a negative differential line. The two ends of the positive differential line and the two ends of the negative differential line are arranged correspondingly, wherein:
正差分线的发送侧设置有N1个回流地孔，正差分线的接收侧设置有N2个回流地孔，负差分线的发送侧设置有M1个回流地孔，负差分线的接收侧设置有M2个回流地孔；The transmitting side of the positive differential line is provided with N1 return ground holes, the receiving side of the positive differential line is provided with N2 return ground holes, the transmitting side of the negative differential line is provided with M1 return ground holes, and the receiving side of the negative differential line is provided with M2 backflow ground holes;
其中，设置于正差分线的发送侧的N1个回流地孔以及设置于负差分线的发送侧的M1个回流地孔使差分线上传输的差分信号产生的第一电压偏差，与设置于正差分线的接收侧的N2个回流地孔以及设置于负差分线的接收侧的M2个回流地孔使差分信号产生的第二电压偏差相互抵消。Among them, the N1 return ground holes arranged on the sending side of the positive differential line and the M1 return ground holes arranged on the sending side of the negative differential line make the first voltage deviation generated by the differential signal transmitted on the differential line different from that set on the positive differential line. The N2 return ground holes on the receiving side of the differential line and the M2 return ground holes disposed on the receiving side of the negative differential line cancel each other out the second voltage deviation generated by the differential signal.
可以理解的是，由于回流地孔造成的差分线阻抗失配的情况随着差分信号的频率(或速率)的提高越为明显，故本发明的背板主要用于高频率(或高速率)差分信号(大于25GHz)。例如本发明的背板可以为一个12层板，层叠结构为SGSGSPPSGSGS(S为信号层，G为地层，P为电源层)，板厚为1.6mm，差分线的阻抗为100欧姆，过孔换层，TOP层进第三信号层出，差分线的线宽为5mil，差分线的线距为12mil，并采用10度走线。当然，本发明对差分线的尺寸、背板的具体结构以及信号应用范围不作特别限定。It can be understood that the impedance mismatch of the differential line caused by the return hole becomes more obvious as the frequency (or rate) of the differential signal increases, so the backplane of the present invention is mainly used for high frequency (or high rate) Differential signals (greater than 25GHz). For example, the backplane of the present invention can be a 12-layer board, the stacked structure is SGSGSPPSGSGS (S is the signal layer, G is the ground layer, P is the power layer), the thickness of the board is 1.6mm, the impedance of the differential line is 100 ohms, and the via hole Layer, the TOP layer enters the third signal layer and exits, the line width of the differential line is 5mil, the line spacing of the differential line is 12mil, and the line is 10 degrees. Certainly, the present invention makes no special limitation on the size of the differential line, the specific structure of the backplane, and the scope of signal application.
作为优选地，设置于正差分线的发送侧的N1个回流地孔距离正差分线的发送端的长度以及设置于正差分线的接收侧的N2个回流地孔距离正差分线的接收端的长度均不大于预设距离；Preferably, the lengths of the N1 backflow ground holes arranged on the sending side of the positive differential line from the sending end of the positive differential line and the lengths of the N2 return ground holes arranged on the receiving side of the positive differential line from the receiving end of the positive differential line are the same. Not greater than the preset distance;
设置于负差分线的发送侧的M1个回流地孔距离差分线的发送端的长度以及设置于负差分线的接收侧的M2个回流地孔距离差分线的接收端的长度均不大于预设距离。The length of the M1 return ground holes set on the sending side of the negative differential line from the sending end of the differential line and the length of the M2 return ground holes set on the receiving side of the negative differential line from the receiving end of the differential line are not greater than the preset distance.
可以理解的是，只有距离差分线的相应端的长度在一定范围内的回流地孔才能够对差分信号产生影响，距离差分线的距离过远的回流地孔不能算作设置于差分线的相应侧。It can be understood that only the return ground holes whose length is within a certain range from the corresponding end of the differential line can affect the differential signal, and the return ground holes that are too far away from the differential line cannot be counted as being set on the corresponding side of the differential line. .
进一步可知，这里的预设距离为36mil。当然，本发明对预设距离的具体数值不做限定。It can be further known that the preset distance here is 36mil. Of course, the present invention does not limit the specific value of the preset distance.
作为优选地，N1与M2相等，N2与M1相等。Preferably, N1 is equal to M2, and N2 is equal to M1.
可以理解的是，例如N1＝M2＝2，N2＝M1＝4，参见图1所示，图1为本发明提供的一种背板上设置的回流地孔的位置示意图；正差分线的发送侧设置有2个回流地孔则相当于正差分线的发送侧有2个寄生电感并联，负差分线的发送侧有4个回流地孔则相当于负差分线的发送侧有4个寄生电感并联，由于并联的寄生电感越多，总电感越小，故正差分线的发送侧的总电感大于负差分线的发送侧的总电感，反映在差分线传输的差分信号的波形上的效果即为加大了正向电压，此时，差分信号的电压变化值为第一电压偏差；同理，正差分线的接收侧相当于有4个寄生电感并联，负差分线的接收侧相当于有2个寄生电感并联，故负差分线的发送侧的总电感大于正差分线的发送侧的总电感，反映在差分线传输的差分信号的波形上的效果即为加大了负向电压，此时，差分信号的电压变化值为第二电压偏差；由于正差分线和负差分线在发送侧的电感差值与负差分线和正差分线在接收侧的电感差值相同，故第一电压偏差与第二电压偏差的绝对值相同，但符号相反。即差分信号的电压幅值可以视为在差分线的发送侧产生了第一电压偏差，发送至接收侧后又在第一电压偏差的基础上产生了第二电压偏差，由于第一电压偏差与第二电压偏差相互抵消，故差分信号的电压幅值不会受到影响而发生扭曲，保证了差分线的信号传输质量，信号完整性好。It can be understood that, for example, N1=M2=2, N2=M1=4, as shown in Figure 1, Figure 1 is a schematic diagram of the position of the return ground hole provided on the backplane provided by the present invention; the transmission of the positive differential line If there are 2 return ground holes on the side, it is equivalent to 2 parasitic inductances on the sending side of the positive differential line, and there are 4 return ground holes on the sending side of the negative differential line, which is equivalent to 4 parasitic inductances on the sending side of the negative differential line. Parallel connection, because the more parasitic inductances in parallel, the smaller the total inductance, so the total inductance of the transmitting side of the positive differential line is greater than the total inductance of the transmitting side of the negative differential line, which is reflected in the waveform of the differential signal transmitted by the differential line. In order to increase the forward voltage, at this time, the voltage change value of the differential signal is the first voltage deviation; similarly, the receiving side of the positive differential line is equivalent to having 4 parasitic inductances connected in parallel, and the receiving side of the negative differential line is equivalent to having Two parasitic inductances are connected in parallel, so the total inductance of the transmitting side of the negative differential line is greater than the total inductance of the transmitting side of the positive differential line. The effect reflected on the waveform of the differential signal transmitted by the differential line is to increase the negative voltage. , the voltage change value of the differential signal is the second voltage deviation; since the inductance difference between the positive differential line and the negative differential line on the sending side is the same as the inductance difference between the negative differential line and the positive differential line on the receiving side, the first voltage deviation The absolute value is the same as the second voltage deviation, but the sign is opposite. That is, the voltage amplitude of the differential signal can be regarded as a first voltage deviation generated on the sending side of the differential line, and a second voltage deviation is generated on the basis of the first voltage deviation after being sent to the receiving side. The second voltage deviations cancel each other, so the voltage amplitude of the differential signal will not be affected and distorted, which ensures the signal transmission quality of the differential line and good signal integrity.
除以上实施例以外，本发明还提供了另一种实施例。In addition to the above embodiments, the present invention also provides another embodiment.
作为优选地，N1与M1相等，N2与M2相等。Preferably, N1 is equal to M1, and N2 is equal to M2.
可以理解的是，例如N1＝M1＝2，N2＝M2＝4。参见图2所示，图2为本发明提供的另一种背板上设置的回流地孔的位置示意图；此种情况下，正差分线的发送侧与负差分线的发送侧相当于并联有相同数目的寄生电感，故差分线的发送侧不会改变电压幅值，即第一电压偏差为零，同理，差分线的接收侧也不会改变电压幅值，第二电压偏差也为零，故第一电压偏差与第二电压偏差总和为零，可视为相互抵消，从而避免差分信号的电压幅值受到回流地孔的影响而发生扭曲，保证了差分线的信号传输质量，信号完整性好。It can be understood that, for example, N1=M1=2, N2=M2=4. Referring to Fig. 2, Fig. 2 is a schematic diagram of the position of the backflow holes provided on another backplane provided by the present invention; in this case, the sending side of the positive differential line and the sending side of the negative differential line are equivalent to parallel connection The same number of parasitic inductances, so the transmitting side of the differential line will not change the voltage amplitude, that is, the first voltage deviation is zero. Similarly, the receiving side of the differential line will not change the voltage amplitude, and the second voltage deviation is also zero. , so the sum of the first voltage deviation and the second voltage deviation is zero, which can be regarded as canceling each other, thereby avoiding the voltage amplitude of the differential signal being distorted by the influence of the return hole, ensuring the signal transmission quality of the differential line, and the signal integrity Good sex.
由此可见，若正差分线与负差分线仅在一侧设置有数量相同的回流地孔(即平衡设置)，而另一侧设置的回流地孔的数量不同(即不平衡设置)，例如N1＝M1＝2，N2＝2，M2＝4，则差分线的发送侧不会产生电压偏差，而差分线的接收侧会加大正向电压，即会产生电压偏差，差分线两侧产生的电压偏差无法相互抵消，故会导致差分信号出现信号扭曲的情况，影响了信号的完整性。It can be seen that if the positive differential line and the negative differential line are only provided with the same number of backflow ground holes on one side (that is, balanced settings), while the number of backflow ground holes set on the other side is different (that is, unbalanced settings), for example N1=M1=2, N2=2, M2=4, then there will be no voltage deviation on the sending side of the differential line, but the forward voltage will be increased on the receiving side of the differential line, that is, a voltage deviation will occur, and the voltage generated on both sides of the differential line The voltage deviations cannot cancel each other out, which will cause signal distortion in the differential signal and affect the integrity of the signal.
在第二种实施例的基础上，作为优选地，N1与N2相等。On the basis of the second embodiment, preferably, N1 and N2 are equal.
可以理解的是，此时M1＝M2＝N1＝N2，例如N1＝2，参见图3所示，图3为本发明提供的另一种背板上设置的回流地孔的位置示意图。It can be understood that at this time M1=M2=N1=N2, for example, N1=2, as shown in FIG. 3 , which is a schematic diagram of the position of another backflow ground hole provided on the backplane provided by the present invention.
另外，由于差分线的结构本身具有一定的固有电气不等长，故差分线传输的差分信号会因为上述不等长结构而造成一定的电压幅度扭曲，这种扭曲与上述的第一电压偏差以及第二电压偏差不同，本发明的第一电压偏差以及第二电压偏差是在该电压幅度扭曲的基础上进一步由回流地孔而引起的电压幅度偏差。In addition, because the structure of the differential line itself has a certain inherent electrical unequal length, the differential signal transmitted by the differential line will cause a certain voltage amplitude distortion due to the above-mentioned unequal length structure. This distortion is consistent with the above-mentioned first voltage deviation and The second voltage deviation is different, and the first voltage deviation and the second voltage deviation of the present invention are further voltage amplitude deviations caused by backflow ground holes on the basis of the voltage amplitude distortion.
其中，图1至图3中，黑色实心圆点表示回流地孔，空心圆点表示差分线的发送端及接受端。Among them, in FIGS. 1 to 3 , black solid circles indicate the return holes, and hollow circles indicate the transmitting end and receiving end of the differential line.
本发明提供了一种背板，该背板上的差分线的两侧设置的回流地孔能够使差分线上传输的差分信号在发送侧产生的第一电压偏差与在接收侧产生的第二电压偏差相互抵消，即本发明的背板上设置的回流地孔的个数能够使差分线两侧的电压幅值保持平衡，避免了差分线上传输的差分信号的幅度发生扭曲，保证了差分信号的完整性，差分信号的传输质量好。The present invention provides a backplane, and the backflow ground holes provided on both sides of the differential line on the backplane can make the first voltage deviation generated on the sending side and the second voltage deviation generated on the receiving side of the differential signal transmitted on the differential line The voltage deviations cancel each other out, that is, the number of return ground holes set on the backplane of the present invention can keep the voltage amplitudes on both sides of the differential line in balance, avoiding distortion of the amplitude of the differential signal transmitted on the differential line, and ensuring differential The integrity of the signal, the transmission quality of the differential signal is good.
需要说明的是，在本说明书中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。It should be noted that in this specification, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or device comprising a set of elements includes not only those elements , but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.
对所公开的实施例的上述说明，使本领域专业技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域的专业技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其他实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要符合与本文所公开的原理和新颖特点相一致的最宽的范围。The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
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| CN1870852A (en) * | 2005-05-28 | 2006-11-29 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board with improved differential via |
| CN102711362A (en) * | 2011-03-28 | 2012-10-03 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board |
| CN103260338A (en) * | 2012-02-21 | 2013-08-21 | 富士通株式会社 | Multilayer wiring board and electronic device |
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| CN1870852A (en) * | 2005-05-28 | 2006-11-29 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board with improved differential via |
| CN102711362A (en) * | 2011-03-28 | 2012-10-03 | 鸿富锦精密工业（深圳）有限公司 | Printed circuit board |
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