CN110856350B - Compensation method and system for board card edge routing return path and board card - Google Patents
Compensation method and system for board card edge routing return path and board card Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0002—Apparatus or processes for manufacturing printed circuits for manufacturing artworks for printed circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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Abstract
The invention discloses a compensation method of a board card edge routing return path, which can find a target signal line with a missing return path according to the information of a return path of a signal line on a board card, and carry out return path compensation on the target signal line according to the actual impedance value of the target signal line under the principle that the missing return path has certain influence on the impedance of the target signal line, so that the actual impedance value of the target signal line approaches to a preset standard impedance value, namely the return path compensation of the target signal line is complete, thereby reducing the line loss. The invention also discloses a compensation system of the board card edge routing return path and a board card, and the compensation system and the board card have the same beneficial effects as the compensation method.
Description
Technical Field
The invention relates to the field of board card design, in particular to a compensation method and system for a board card edge routing return path and a board card.
Background
Currently, a board card includes a plurality of signal layers having signal lines for transmitting electrical signals, and each of the upper and lower layers of each signal layer has a reference layer, as shown in fig. 1, which is used to provide a return path for signals transmitted on the signal layer between the two reference layers. When the board card is designed, the width of a return path is required to be larger than the width of a signal line of a certain multiple, however, the size of the board card is limited by the structural limitation of a pre-installed case, so that some signal lines on a signal layer of the board card need to be arranged at positions close to the edge of the board card, and the return paths of the signal lines are probably incomplete, so that the impedance of the signal lines is influenced, and the loss of the line is increased.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a compensation method and a compensation system for a board card edge routing return path and a board card, which can find a target signal line with a missing return path according to the information of a return path of a signal line on the board card, and perform return path compensation on the target signal line according to the actual impedance value of the target signal line so as to enable the actual impedance value of the target signal line to approach a preset standard impedance value, namely the return path compensation of the target signal line is complete, thereby reducing the line loss.
In order to solve the above technical problem, the present invention provides a compensation method for a board edge routing return path, which includes:
after the board card finishes wiring, obtaining backflow path information of a signal line on a signal layer of the board card, wherein the backflow path information is close to the edge of the board card;
determining a target signal line with a missing return path according to the backflow path information of the signal line;
detecting an actual impedance value of the target signal line, and solving a difference value between the actual impedance value and a preset standard impedance value;
and determining the return path compensation quantity of the target signal line according to the difference value, and performing return path compensation on the target signal line according to the return path compensation quantity until the difference value is reduced to be within an allowable range.
Preferably, the return path information of the signal line includes: the linear distance between the signal line and the edge of the board card closest to the signal line, and the thickness of the reference layer closest to the signal line;
correspondingly, the process of determining a target signal line with a missing return path according to the information of the return path of the signal line includes:
judging whether the linear distance is smaller than the thickness of a preset multiple or not according to the linear distance and the thickness corresponding to the signal line;
if so, determining the signal line as a target signal line with a missing return path;
and if not, determining that the return path of the signal line is complete.
Preferably, the process of performing the return path compensation on the target signal line according to the return path compensation amount includes:
and according to the return path compensation quantity, carrying out return path compensation on the target signal line on the signal layer where the target signal line is located.
Preferably, the process of performing return path compensation on the target signal line on the signal layer where the target signal line is located includes:
and adding a GND attribute routing on a signal layer where the target signal line is located so as to perform return path compensation on the target signal line.
Preferably, the compensation method further comprises:
after the return path compensation is carried out on the target signal line, an impedance curve is generated according to the impedance simulation condition of the target signal line under the condition;
and controlling a display to display the impedance curve.
Preferably, the compensation method further comprises:
after the return path compensation is carried out on the target signal line, generating an insertion loss curve according to the insertion loss simulation condition of the target signal line under the condition;
and controlling the display to display the insertion loss curve.
In order to solve the above technical problem, the present invention further provides a compensation system for a board edge routing return path, including:
the acquisition module is used for acquiring the information of a backflow path of a signal wire close to the edge of the board card on a signal layer of the board card after the board card finishes wiring;
the determining module is used for determining a target signal line with a missing return path according to the backflow path information of the signal line;
the calculating module is used for detecting the actual impedance value of the target signal line and calculating the difference value between the actual impedance value and a preset standard impedance value;
and the compensation module is used for determining the return path compensation quantity of the target signal line according to the difference value, and performing return path compensation on the target signal line according to the return path compensation quantity until the difference value is reduced to be within an allowable range.
Preferably, the return path information of the signal line includes: the linear distance between the signal line and the edge of the board card closest to the signal line, and the thickness of the reference layer closest to the signal line;
correspondingly, the determining module is specifically configured to determine whether the linear distance is smaller than a preset multiple of thickness according to the linear distance and the thickness corresponding to the signal line; if so, determining the signal line as a target signal line with a missing return path; and if not, determining that the return path of the signal line is complete.
Preferably, the compensation system further comprises:
and the display module is used for generating an impedance curve according to the impedance simulation condition of the target signal line under the condition after the return path compensation is carried out on the target signal line, and controlling a display to display the impedance curve.
In order to solve the above technical problem, the present invention further provides a board card, including:
a signal layer provided with a signal line;
the upper reference layer is arranged on the upper layer surface of the signal layer;
the lower reference layer is arranged on the lower layer surface of the signal layer;
a compensation structure for compensating a return path of a signal line whose return path is missing; the compensation structure is obtained by adopting any one of the compensation methods for the routing return path at the edge of the card.
The invention provides a compensation method of a board card edge routing return path, which can find a target signal line with a missing return path according to the information of a return path of a signal line on a board card, and carry out return path compensation on the target signal line according to the actual impedance value of the target signal line under the principle that the missing return path has certain influence on the impedance of the target signal line, so that the actual impedance value of the target signal line approaches to a preset standard impedance value, namely the return path compensation of the target signal line is complete, thereby reducing the line loss.
The invention also provides a compensation system of the board card edge routing return path and a board card, and the compensation system and the board card have the same beneficial effects as the compensation method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a board card in the prior art.
Fig. 2 is a flowchart of a compensation method for a board edge trace return path according to an embodiment of the present invention;
FIG. 3 is a comparison graph of impedance curves before and after compensation of a signal line according to an embodiment of the present invention;
fig. 4 is a comparison graph of insertion loss curves before and after compensation of a signal line according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a compensation system for a board edge trace return path according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a compensation method, a system and a board card of a board card edge routing return path, which can find a target signal line with a missing return path according to the information of the return path of the signal line on the board card, and perform return path compensation on the target signal line according to the actual impedance value of the target signal line, so that the actual impedance value of the target signal line approaches to a preset standard impedance value, namely the return path compensation of the target signal line is complete, thereby reducing the line loss.
In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2, fig. 2 is a flowchart illustrating a compensation method for a board edge routing return path according to an embodiment of the present invention.
The compensation method for the board card edge routing return path comprises the following steps:
step S1: and after the board card finishes wiring, obtaining the information of the backflow path of the signal wire close to the edge of the board card on the signal layer of the board card.
Specifically, the number of layers of the board card is designed according to the circuit complexity, then the thickness of each layer of the board card is designed according to the preset board card thickness, and finally the wiring design of the board card is completed. Considering that the problem that the routing at the edge of the board card is easy to generate incomplete return paths, the method and the device for judging the return paths of the edge signal lines obtain the information of the return paths of the signal lines close to the edge of the board card on the signal layer of the board card after the board card finishes the wiring, and lay a foundation for subsequently judging whether the return paths of the edge signal lines are complete or not.
Step S2: and determining a target signal line with a missing return path according to the backflow path information of the signal line.
In particular, since the return path information of the signal lines can characterize the integrity of the return paths of the signal lines, the present application can find out the signal lines with missing return paths from the signal lines, which are called target signal lines, according to the return path information of the signal lines.
Step S3: and detecting the actual impedance value of the target signal line, and solving the difference value between the actual impedance value and the preset standard impedance value.
It should be noted that the preset of the present application is set in advance, and only needs to be set once, and the reset is not needed unless the modification is needed according to the actual situation.
Specifically, considering that the missing of the return path of the target signal line can affect the impedance value of the target signal line, so that the impedance value of the target signal line deviates from the impedance value of the signal line under the complete return path, the method and the device adopt the impedance value of the target signal line to judge whether the compensation of the return path of the target signal line is complete.
Based on this, the present application takes in advance the impedance value of the signal line under the complete return path as the standard impedance value. After determining the target signal line with the missing return path in step S2, the actual impedance value of the target signal line is detected, and it can be understood that the compensation target of the target signal line is: the actual impedance value of the target signal line approaches to the standard impedance value as much as possible, so the difference value between the actual impedance value of the target signal line and the standard impedance value is obtained by the method, and a foundation is laid for the subsequent compensation of the return path of the target signal line.
Step S4: and determining the return path compensation amount of the target signal line according to the difference, and performing return path compensation on the target signal line according to the return path compensation amount until the difference is reduced to be within an allowable range.
Specifically, according to the difference between the actual impedance value and the standard impedance value of the target signal line, the return path compensation amount of the target signal line is determined, and then the return path compensation is performed on the target signal line according to the return path compensation amount of the target signal line. And after the target signal line is subjected to primary return path compensation, detecting the actual impedance value of the target signal line again, solving the difference value between the actual impedance value of the target signal line and the standard impedance value, and then performing secondary return path compensation on the target signal line according to the difference value between the actual impedance value of the target signal line and the standard impedance value until the difference value is reduced to the allowable range, so that the return path compensation of the target signal line is considered to be complete, and the line loss is reduced.
The invention provides a compensation method of a board card edge routing return path, which can find a target signal line with a missing return path according to the information of a return path of a signal line on a board card, and carry out return path compensation on the target signal line according to the actual impedance value of the target signal line under the principle that the missing return path has certain influence on the impedance of the target signal line, so that the actual impedance value of the target signal line approaches to a preset standard impedance value, namely the return path compensation of the target signal line is complete, thereby reducing the line loss.
On the basis of the above-described embodiment:
as an alternative embodiment, the return path information of the signal line includes: the linear distance between the signal line and the edge of the board card closest to the signal line, and the thickness of the reference layer closest to the signal line;
correspondingly, the process of determining the target signal line with the missing return path according to the backflow path information of the signal line comprises the following steps:
judging whether the linear distance is smaller than the thickness of a preset multiple or not according to the linear distance and the thickness corresponding to the signal line;
if so, determining the signal line as a target signal line with a missing return path;
and if not, determining that the return path of the signal line is complete.
Specifically, the information on the return path of the signal line of the present application includes: the straight-line distance x between the signal line and the edge of the board closest to the signal line, and the thickness y of the reference layer closest to the signal line. For any signal line, the signal line corresponds to a straight line distance x and a thickness y, and if the straight line distance x is less than a preset multiple x the thickness y, the return path of the signal line is considered to be incomplete; otherwise, the return path of the signal line is considered to be complete.
Based on this, after the information of the backflow path of the signal line on the signal layer of the board card close to the edge of the board card is obtained in step S1, it is determined whether the linear distance corresponding to each signal line is smaller than the thickness of the corresponding preset multiple (generally, 3 to 6 times of thickness is selected), and if so, it is determined that the return path of the signal line is missing, that is, the signal line is used as the target signal line to be compensated for the return path; and if not, determining that the return path of the signal line is complete.
As an alternative embodiment, the process of performing the return path compensation on the target signal line according to the return path compensation amount includes:
and according to the return path compensation quantity, carrying out return path compensation on the target signal line on the signal layer where the target signal line is located.
Specifically, the return path compensation can be performed on the target signal line on the signal layer where the target signal line is located, that is, the problem that the return paths of the upper and lower reference layers of the target signal line are missing is solved by compensating the return paths on the same layer.
As an alternative embodiment, the process of performing return path compensation on the target signal line on the signal layer where the target signal line is located includes:
and adding a GND attribute routing on a signal layer where the target signal line is positioned so as to perform return path compensation on the target signal line.
Specifically, when the signal on the board card is transmitted, the flow direction of the signal is from the driving chip to the load along the transmission line, and then the signal is returned to the driving chip end by the load along the shortest path on the ground, and the shortest path for returning the signal on the ground is the signal return path.
According to the signal transmission theory, the layer of the GND attribute in the board card is the return path of all signals, so that GND attribute routing can be additionally arranged on the signal layer where the target signal line is located to compensate the missing part of the return paths of the upper reference layer and the lower reference layer of the target signal line.
As an alternative embodiment, the compensation method further comprises:
after the return path compensation is carried out on the target signal line, an impedance curve is generated according to the impedance simulation condition of the target signal line under the condition;
the display is controlled to display an impedance curve.
Furthermore, after the target signal line is subjected to return path compensation, the impedance of the target signal line under the condition can be simulated to obtain an impedance curve of the target signal line after the return path compensation, and then the display is controlled to display the impedance curve for a designer to check. Naturally, before the target signal line is subjected to the return path compensation, the impedance of the target signal line under the condition can be simulated to obtain an impedance curve of the target signal line before the return path compensation, and then the impedance curve is controlled to be displayed by the display so that a designer can compare the impedance curves before and after the target signal line compensation.
Referring to fig. 3, fig. 3 is a comparison diagram of impedance curves before and after signal line compensation according to an embodiment of the present invention. In fig. 3, the uppermost curve represents the impedance curve of the target signal line before the return path compensation; the three curves at the lower part respectively represent the impedance curves of the target signal line after compensation in three different return paths. The standard impedance value is 85 ohms, and at the time point of m1, the impedance value of the target signal line before the return path compensation is about 88 ohms and deviates from the standard impedance value; after compensation of three different return paths, the impedance value of the target signal line is reduced to about 85 ohms and approaches to a standard impedance value.
As an alternative embodiment, the compensation method further comprises:
after the return path compensation is carried out on the target signal line, an insertion loss curve is generated according to the insertion loss simulation condition of the target signal line under the condition;
and controlling a display to display the insertion loss curve.
Furthermore, after the return path compensation is carried out on the target signal line, the insertion loss of the target signal line under the condition can be simulated, so that an insertion loss curve of the target signal line after the return path compensation is obtained, and then the display is controlled to display the insertion loss curve for a designer to check. Of course, before the return path compensation is performed on the target signal line, the insertion loss of the target signal line under the condition can be simulated to obtain an insertion loss curve of the target signal line before the return path compensation, and then the display is controlled to display the insertion loss curve, so that a designer can compare the insertion loss curve before and after the target signal line compensation.
Referring to fig. 4, fig. 4 is a graph comparing insertion loss curves before and after signal line compensation according to an embodiment of the present invention. In fig. 4, the lower curve represents the impedance curve of the target signal line before the return path compensation; the upper curve represents the impedance curve of the target signal line after compensation in the return path. Therefore, the insertion loss of the target signal line is obviously improved after the return path compensation.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a compensation system for a board edge routing return path according to an embodiment of the present invention.
The compensation system for the board card edge routing return path comprises:
the acquisition module 1 is used for acquiring the information of a backflow path of a signal wire close to the edge of the board card on a signal layer of the board card after the board card finishes wiring;
the determining module 2 is used for determining a target signal line with a missing return path according to the backflow path information of the signal line;
the calculating module 3 is used for detecting the actual impedance value of the target signal line and calculating the difference value between the actual impedance value and the preset standard impedance value;
and the compensation module 4 is used for determining the return path compensation amount of the target signal line according to the difference value, and performing return path compensation on the target signal line according to the return path compensation amount until the difference value is reduced to be within an allowable range.
As an alternative embodiment, the return path information of the signal line includes: the linear distance between the signal line and the edge of the board card closest to the signal line, and the thickness of the reference layer closest to the signal line;
correspondingly, the determining module 2 is specifically configured to determine whether the linear distance is smaller than a preset multiple of the thickness according to the linear distance and the thickness corresponding to the signal line; if so, determining the signal line as a target signal line with a missing return path; and if not, determining that the return path of the signal line is complete.
As an alternative embodiment, the compensation system further comprises:
and the display module is used for generating an impedance curve according to the impedance simulation condition of the target signal line after the return path compensation is carried out on the target signal line, and controlling the display to display the impedance curve.
For introduction of the compensation system provided in the present application, reference is made to the embodiments of the compensation method described above, and details of the compensation system are not repeated herein.
The application also provides a board card, including:
a signal layer provided with a signal line;
an upper reference layer arranged on the upper layer surface of the signal layer;
the lower reference layer is arranged on the lower layer surface of the signal layer;
a compensation structure for compensating a return path of a signal line whose return path is missing; the compensation structure is obtained by adopting any one of the compensation methods for the routing return path at the edge of the card.
For the introduction of the board card provided in the present application, reference is made to the embodiments of the compensation method described above, and details of the present application are not repeated herein.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for compensating a return path of a card edge trace, comprising:
after the board card finishes wiring, obtaining backflow path information of a signal line on a signal layer of the board card, wherein the backflow path information is close to the edge of the board card;
determining a target signal line with a missing return path according to the backflow path information of the signal line;
detecting an actual impedance value of the target signal line, and solving a difference value between the actual impedance value and a preset standard impedance value;
and determining the return path compensation quantity of the target signal line according to the difference, adding a GND attribute routing on the signal layer where the target signal line is located according to the return path compensation quantity, and performing return path compensation on the target signal line until the difference is reduced to be within an allowable range.
2. The method of claim 1, wherein the return path information of the signal line comprises: the linear distance between the signal line and the edge of the board card closest to the signal line, and the thickness of the reference layer closest to the signal line;
correspondingly, the process of determining a target signal line with a missing return path according to the information of the return path of the signal line includes:
judging whether the linear distance is smaller than the thickness of a preset multiple or not according to the linear distance and the thickness corresponding to the signal line;
if so, determining the signal line as a target signal line with a missing return path;
and if not, determining that the return path of the signal line is complete.
3. A method for compensating a board card edge trace return path as recited in any of claims 1-2, wherein the method further comprises:
after the return path compensation is carried out on the target signal line, an impedance curve is generated according to the impedance simulation condition of the target signal line under the condition;
and controlling a display to display the impedance curve.
4. A method of compensating for a card edge trace return path as recited in claim 3, wherein the method further comprises:
after the return path compensation is carried out on the target signal line, generating an insertion loss curve according to the insertion loss simulation condition of the target signal line under the condition;
and controlling the display to display the insertion loss curve.
5. A system for compensating a card edge trace return path, comprising:
the acquisition module is used for acquiring the information of a backflow path of a signal wire close to the edge of the board card on a signal layer of the board card after the board card finishes wiring;
the determining module is used for determining a target signal line with a missing return path according to the backflow path information of the signal line;
the calculating module is used for detecting the actual impedance value of the target signal line and calculating the difference value between the actual impedance value and a preset standard impedance value;
and the compensation module is used for determining the return path compensation quantity of the target signal line according to the difference value, adding a GND attribute routing on the signal layer where the target signal line is located according to the return path compensation quantity, and performing return path compensation on the target signal line until the difference value is reduced to be within an allowable range.
6. The system for board edge trace return path compensation of claim 5, wherein the return path information for the signal line comprises: the linear distance between the signal line and the edge of the board card closest to the signal line, and the thickness of the reference layer closest to the signal line;
correspondingly, the determining module is specifically configured to determine whether the linear distance is smaller than a preset multiple of thickness according to the linear distance and the thickness corresponding to the signal line; if so, determining the signal line as a target signal line with a missing return path; and if not, determining that the return path of the signal line is complete.
7. A compensation system for a card edge trace return path according to any of claims 5-6, wherein the compensation system further comprises:
and the display module is used for generating an impedance curve according to the impedance simulation condition of the target signal line under the condition after the return path compensation is carried out on the target signal line, and controlling a display to display the impedance curve.
8. A board card, comprising:
a signal layer provided with a signal line;
the upper reference layer is arranged on the upper layer surface of the signal layer;
the lower reference layer is arranged on the lower layer surface of the signal layer;
a compensation structure for compensating a return path of a signal line whose return path is missing; the compensation structure is obtained by adopting the compensation method for the board card edge routing return path according to any one of claims 1 to 4.
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