CN117634403B

CN117634403B - Transmission line structure determining method, system, equipment and readable storage medium

Info

Publication number: CN117634403B
Application number: CN202410096511.1A
Authority: CN
Inventors: 关盈; 刘强
Original assignee: Shandong Yunhai Guochuang Cloud Computing Equipment Industry Innovation Center Co Ltd
Current assignee: Shandong Yunhai Guochuang Cloud Computing Equipment Industry Innovation Center Co Ltd
Priority date: 2024-01-24
Filing date: 2024-01-24
Publication date: 2024-05-10
Anticipated expiration: 2044-01-24
Also published as: CN117634403A

Abstract

The invention discloses a transmission line structure determining method, a system, equipment and a readable storage medium, which relate to the field of integrated circuits and aim to solve the signal distortion problem caused by discontinuous transmission line impedance in a local mixed voltage structure; calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency plate parameters and the low-frequency plate parameters; determining the length of the transition transmission line by utilizing the high-frequency line width and the low-frequency line width; the structure of the transmission line is determined according to the high-frequency line width, the low-frequency line width and the length, so that the impedance of the transmission line in the high-frequency plate area is continuous with the impedance of the transmission line in the low-frequency plate area. The invention can realize the smooth transition of the impedance of the transmission line in different plate areas, improve the effectiveness of the transmitted signals and ensure the time sequence of the system.

Description

Transmission line structure determining method, system, equipment and readable storage medium

Technical Field

The present invention relates to the field of integrated circuits, and in particular, to a transmission line structure determining method, system, device, and readable storage medium.

Background

Along with the improvement of miniaturization requirements of electronic products and the development and progress of integrated circuit technologies, electromagnetic environments in multilayer PCBs (Printed Circuit Board, printed circuit boards) are more complex, high-frequency boards are adopted to replace low-frequency boards in more and more PCB designs, and in order to reduce cost and reduce signal loss and interference, the low-frequency boards and the high-frequency boards form a mixed-voltage structure through reasonable lamination structures and lamination parameters. Because various mediums exist in the PCB adopting the local mixed voltage structure, the discontinuity of the mediums causes the discontinuity of the impedance of the transmission line, the discontinuity of the impedance of the transmission line can cause signal reflection, signal distortion is caused, even ringing phenomenon can be generated due to repeated signal back and forth reflection, and the time sequence of the system is further influenced.

Therefore, how to provide a solution to the above technical problem is a problem that a person skilled in the art needs to solve at present.

Disclosure of Invention

The invention aims to provide a transmission line structure determining method, a system, equipment and a readable storage medium, which can realize smooth transition of impedance of a transmission line in different plate areas, improve the effectiveness of transmitted signals and ensure the time sequence of the system.

In order to solve the above technical problems, the present invention provides a transmission line structure determining method, where the transmission line includes a high-frequency transmission line for transmitting signals in a high-frequency board area, and a low-frequency transmission line for transmitting signals in a low-frequency board area, the transmission line further includes a transition transmission line having a first end connected to the high-frequency transmission line and a second end connected to the low-frequency transmission line, and the high-frequency transmission line and the low-frequency transmission line are both transmission lines with equal line widths, and the transmission line structure determining method includes:

Determining high-frequency plate parameters of the high-frequency plate area and low-frequency plate parameters of the low-frequency plate area;

Calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency plate parameters and the low-frequency plate parameters;

determining the length of the transition transmission line by utilizing the high-frequency line width and the low-frequency line width; the line width of the first end of the transition transmission line is the high-frequency line width, and the line width of the second end of the transition transmission line is the low-frequency line width;

And determining the structure of the transmission line according to the high-frequency line width, the low-frequency line width and the length so that the impedance of the transmission line in the high-frequency plate area is continuous with the impedance of the transmission line in the low-frequency plate area.

In an exemplary embodiment, the process of calculating the high frequency linewidth of the high frequency transmission line and the low frequency linewidth of the low frequency transmission line based on the high frequency board parameters and the low frequency board parameters includes:

Acquiring the type of the transmission line;

Determining an impedance relation corresponding to the type; the impedance relational expression is a relational expression established based on the plate parameters;

and calculating the high-frequency linewidth of the high-frequency transmission line and the low-frequency linewidth of the low-frequency transmission line by using the impedance relational expression.

In an exemplary embodiment, the type comprises a single ended type, and the sheet material parameter comprises a sheet material dielectric constant;

the process of determining the impedance relationship corresponding to the type includes:

when the type is the single-ended type, determining the impedance relation as a first impedance relation, wherein the first impedance relation is ；

Where i=1 or 2, z _i is the impedance value of the target transmission line,And h is the dielectric constant of the plate in the plate area where the target transmission line is located, t is the metal thickness of the target transmission line, w _i is the line width of the target transmission line, when i=1, the target transmission line is the high-frequency transmission line, and when i=2, the target transmission line is the low-frequency transmission line.

In an exemplary embodiment, the transition transmission line is of symmetrical structure.

In an exemplary embodiment, the calculating the high frequency linewidth of the high frequency transmission line and the low frequency linewidth of the low frequency transmission line using the impedance relation includes:

When the type of the transmission line is a differential type, determining a plurality of groups of structural parameters by utilizing the impedance relational expression, wherein each group of structural parameters comprises a high-frequency line width and a high-frequency line spacing of the high-frequency transmission line, and a low-frequency line width and a low-frequency line spacing of the low-frequency transmission line;

Determining a target structural parameter from a plurality of groups of structural parameters;

The process of determining the structure of the transmission line according to the high-frequency line width, the low-frequency line width and the length comprises the following steps:

And determining the structure of the transmission line according to the target structure parameter and the length so as to minimize the loss of the transmission line.

In an exemplary embodiment, the type comprises a differential type and the sheet material parameter comprises a sheet material dielectric constant;

When the type is the differential type, determining the impedance relation as a second impedance relation, wherein the second impedance relation is ；

Where j=1 or 2, z _j is the impedance value of the target transmission line,And h is the dielectric constant of the plate in the plate area where the target transmission line is located, t is the metal thickness of the target transmission line, w _j is the line width of the target transmission line, s _j is the line spacing of the target transmission line, when i=1, the target transmission line is the high-frequency transmission line, and when i=2, the target transmission line is the low-frequency transmission line.

In an exemplary embodiment, the transition transmission line includes a first differential transition transmission line and a second differential transition transmission line, and determining the target structural parameter from among the plurality of sets of structural parameters includes:

Acquiring an optimal structural condition relation; the first differential transition transmission line and the second differential transition transmission line corresponding to the optimal structural condition relation are of an internal oblique cutting structure;

And determining the structural parameters meeting the optimal structural condition relation in the plurality of groups of structural parameters as target structural parameters.

In an exemplary embodiment, the optimal structural condition relation is 2w ₁+s₁=2w₂+s₂.

and calculating the high-frequency linewidth of the high-frequency transmission line and the low-frequency linewidth of the low-frequency transmission line by using the impedance relational expression and a target condition, wherein the target condition is that the impedance value of the high-frequency transmission line is equal to the impedance value of the low-frequency transmission line.

In an exemplary embodiment, determining the length of the transition transmission line using the high frequency linewidth and the low frequency linewidth includes:

Acquiring the type of the transmission line;

determining a length relation corresponding to the type; the length relation is a relation established based on the high-frequency line width and the low-frequency line width;

and determining the length of the transition transmission line based on the length relation.

In an exemplary embodiment, the type includes a single-ended type, and determining the length relation corresponding to the type includes:

When the type is the single-ended type, determining the length relation as a first length relation, wherein the first length relation is ；

Wherein w ₁ is the high-frequency line width, w ₂ is the low-frequency line width, L is the length, and alpha is a preset connection angle.

In an exemplary embodiment, the type includes a differential type, and determining the length relation corresponding to the type includes:

When the type is the differential type, determining the length relation as a second length relation, wherein the second length relation is ；

In order to solve the above technical problem, the present invention further provides a transmission line structure determining system, where the transmission line includes a high-frequency transmission line for transmitting signals in a high-frequency board area and a low-frequency transmission line for transmitting signals in a low-frequency board area, the transmission line further includes a transition transmission line having a first end connected to the high-frequency transmission line and a second end connected to the low-frequency transmission line, and the high-frequency transmission line and the low-frequency transmission line are both transmission lines with equal line widths, the transmission line structure determining system includes:

the first determining module is used for determining the high-frequency plate parameters of the high-frequency plate area and the low-frequency plate parameters of the low-frequency plate area;

A first calculation module for calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency board parameters and the low-frequency board parameters;

The second calculation module is used for determining the length of the transition transmission line by utilizing the high-frequency line width and the low-frequency line width; the line width of the first end of the transition transmission line is the high-frequency line width, and the line width of the second end of the transition transmission line is the low-frequency line width;

And the second determining module is used for determining the structure of the transmission line according to the high-frequency line width, the low-frequency line width and the length so as to ensure that the impedance of the transmission line in the high-frequency plate area is continuous with the impedance of the transmission line in the low-frequency plate area.

In order to solve the technical problem, the present invention further provides an electronic device, including:

A memory for storing a computer program;

a processor for implementing the steps of the transmission line structure determination method according to any one of the preceding claims when executing the computer program.

To solve the above technical problem, the present invention further provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of the transmission line structure determination method according to any one of the above.

The invention provides a transmission line structure determining method, which is characterized in that line widths of a high-frequency transmission line and a low-frequency transmission line are respectively determined according to plate parameters of a high-frequency plate area and a low-frequency plate area, a transition transmission line is designed to be connected with the high-frequency transmission line and the low-frequency transmission line, the line width of one end of the transition transmission line, which is connected with the high-frequency transmission line, is the high-frequency line width of the high-frequency transmission line, the line width of one end of the transition transmission line, which is connected with the low-frequency transmission line, is the line width of the low-frequency transmission line, the length of the transition transmission line is determined based on the high-frequency line width and the low-frequency line width, and additional impedance at the connection position of different plate areas is compensated through the transition transmission line, so that smooth transition of impedance of the transmission line in different plate areas is realized, the effectiveness of transmitted signals is improved, and the time sequence of a system is ensured. The invention also provides a transmission line structure determining system, electronic equipment and a computer readable storage medium, which have the same beneficial effects as the transmission line structure determining method.

Drawings

For a clearer description of embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described, it being apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a flowchart of a transmission line structure determining method according to the present invention;

FIG. 2 is a schematic diagram of a hybrid structure according to the present invention;

Fig. 3 is a schematic diagram of a single-ended transmission line structure according to the present invention;

fig. 4 is a schematic diagram of a single-ended transmission line structure with an external bevel transition shape according to the present invention;

fig. 5 is a schematic diagram of a single-ended transmission line structure with an internal bevel transition shape according to the present invention;

fig. 6 is a schematic diagram of a differential transmission line structure with an internal chamfer transition shape according to the present invention;

Fig. 7 is a schematic diagram of a symmetrical transition differential transmission line structure according to the present invention;

fig. 8 is a schematic diagram of a differential transmission line structure with an outer chamfer transition shape according to the present invention;

Fig. 9 is a schematic structural diagram of a transmission line structure determining system according to the present invention;

fig. 10 is a schematic structural diagram of an electronic device according to the present invention;

Fig. 11 is a schematic structural diagram of a computer readable storage medium according to the present invention.

Detailed Description

The core of the invention is to provide a transmission line structure determining method, a system, equipment and a readable storage medium, which can realize the smooth transition of impedance of a transmission line in different plate areas, improve the effectiveness of transmitted signals and ensure the time sequence of the system.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1, fig. 1 is a flowchart illustrating a transmission line structure determining method according to the present invention, where the transmission line structure determining method includes:

s101: determining high-frequency plate parameters of a high-frequency plate area and low-frequency plate parameters of a low-frequency plate area;

s102: calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency plate parameters and the low-frequency plate parameters;

It will be appreciated that designing a hybrid structure embedded with high frequency material at a localized location in a complete PCB board is referred to as localized hybrid PCB, where the motherboard is made of low frequency board material. Referring to fig. 2, after the mother board completes the fabrication of the inner layer circuit pattern according to the normal process, the mother board is grooved or hollowed at the local position, the high frequency core board is cut into small units after completing the fabrication of the inner layer circuit pattern, the small units are matched with the size of the accommodating groove formed in the mother board, the high frequency high speed board is buried as a daughter board in the hollowed or grooved position during lamination typesetting, and is pressed together with the mother board, and the prepreg has certain fluidity, so that part of glue flows into the gaps around the high frequency board and the low frequency board after pressing, reliable connection is realized, the daughter board and the mother board form a whole after pressing, and other conventional operations such as drilling and copper deposition operation, screen printing fabrication and the like are performed, thus the local mixed pressure PCB is fabricated.

In the local mixed-voltage PCB, there are a high-frequency board area and a low-frequency board area, and the transmission line passes through both the high-frequency board area and the low-frequency board area at the same time, and the impedance is changed due to the discontinuity of the medium in the high-frequency board area and the low-frequency board area, so that reflection and distortion are generated when signals are transmitted. It can be understood that the dielectric constant of the high-frequency plate area is smaller than that of the common plate area, and the impedance of the transmission line is larger, at this time, in order to ensure that the impedance is unchanged, the width of the high-frequency transmission line arranged in the high-frequency plate area can be widened to ensure that the impedance is unchanged. In the lamination process of the local mixed-pressure PCB, a gap exists between the high-frequency board area and the low-frequency board area, the high-frequency board area and the low-frequency board area are filled by glue overflow after the prepreg is melted and flowed, so that the high-frequency board area and the low-frequency board area are bonded into a whole, and an additional reactance is introduced due to line width jump.

In order to ensure the impedance consistency of the transmission line in the low-frequency plate area and the high-frequency plate area, the plate dielectric constant of the high-frequency plate area and the plate dielectric constant of the low-frequency plate area are firstly obtained, so that the line width of the transmission line in the high-frequency plate area, namely the high-frequency line width of the high-frequency transmission line, and the line width of the transmission line in the low-frequency plate area, namely the low-frequency line width of the low-frequency transmission line, are respectively determined.

The transmission line may be a single-ended transmission line or a differential transmission line, and it is understood that the differential transmission line includes two transmission lines, and each transmission line may be regarded as a single-ended transmission line.

S103: determining the length of the transition transmission line by utilizing the high-frequency line width and the low-frequency line width; the line width of the first end of the transition transmission line is a high-frequency line width, and the line width of the second end of the transition transmission line is a low-frequency line width;

S104: the structure of the transmission line is determined according to the high-frequency line width, the low-frequency line width and the length, so that the impedance of the transmission line in the high-frequency plate area is continuous with the impedance of the transmission line in the low-frequency plate area.

In order to ensure smooth transition of impedance of the transmission line in the low-frequency board region and the high-frequency board region, the embodiment determines the line width and the length of the transition transmission line based on the high-frequency line width and the low-frequency line width, wherein the line width of one end of the transition transmission line connected with the high-frequency transmission line is the high-frequency line width of the high-frequency transmission line, and the line width of one end of the transition transmission line connected with the low-frequency transmission line is the low-frequency line width of the low-frequency transmission line. The structure of the transmission line can be determined according to the high-frequency line width, the low-frequency line width and the length of the transition transmission line, and the transmission line designed by adopting the scheme in the PCB of the mixed voltage structure can ensure continuous impedance and avoid the problem of signal distortion.

In this embodiment, the line widths of the high-frequency transmission line and the low-frequency transmission line are determined according to the board parameters of the high-frequency board area and the low-frequency board area, the transition transmission line is designed to connect the high-frequency transmission line and the low-frequency transmission line, so that the line width of one end of the transition transmission line connected with the high-frequency transmission line is the high-frequency line width of the high-frequency transmission line, the line width of one end of the transition transmission line connected with the low-frequency transmission line is the line width of the low-frequency transmission line, the length of the transition transmission line is determined based on the high-frequency line width and the low-frequency line width, and the additional impedance at the connection part of different board areas is compensated through the transition transmission line, thereby realizing smooth transition of the impedance of the transmission line in different board areas, improving the effectiveness of the transmitted signals, and guaranteeing the time sequence of the system.

Based on the above embodiments:

Acquiring the type of a transmission line;

determining an impedance relational expression corresponding to the type; the impedance relational expression is a relational expression established based on the plate parameters;

It can be understood that, since the differential transmission line includes two transmission lines, the impedance of the differential transmission line is also related to the line spacing between the two transmission lines, the embodiment first determines the types of the transmission lines, including a differential type and a single-ended type, the transmission line corresponding to the differential type is a differential transmission line, the transmission line corresponding to the single-ended type is a single-ended transmission line, and the line widths of the high-frequency transmission line and the low-frequency transmission line are calculated based on the corresponding impedance relation determined based on different types, so that the designed line widths can meet the requirement of smooth impedance transition.

when the type is single-ended, determining that the impedance relation is a first impedance relation, the first impedance relation being ；

Where i=1 or 2, z _i is the impedance value of the target transmission line,The dielectric constant of the plate in the plate area where the target transmission line is located is h, the thickness of the medium between the target transmission line and the plate area is h, t is the metal thickness of the target transmission line, w _i is the line width of the target transmission line, when i=1, the target transmission line is a high-frequency transmission line, and when i=2, the target transmission line is a low-frequency transmission line.

The impedance Z ₁ of the high-frequency transmission line in the high-frequency plate region is:

Wherein Z ₁ is the impedance value of the high-frequency transmission line,/> The dielectric constant of the high-frequency plate is h, the thickness of a medium between the high-frequency transmission line and the high-frequency plate is h, t is the metal thickness of the high-frequency transmission line, and w ₁ is the line width of the high-frequency transmission line.

The impedance Z ₂ of the low-frequency transmission line in the low-frequency sheet region is:

Wherein Z ₂ is the impedance value of the low-frequency transmission line,/> The dielectric constant of the low-frequency plate area is h, the thickness of a medium between the low-frequency transmission line and the low-frequency plate area is h, t is the metal thickness of the low-frequency transmission line, and w ₂ is the line width of the low-frequency transmission line.

In order to ensure the consistency of the impedance, the Z ₁=Z₂ can calculate the line widths of the transmission lines of the high-frequency plate area and the low-frequency plate area under the condition of unchanged impedance, namely the high-frequency line width and the low-frequency line width according to the dielectric constants of different plates.

In an exemplary embodiment, where the type includes a single-ended type, determining the length relation corresponding to the type includes:

when the type is single-ended, determining that the length relation is a first length relation, wherein the first length relation is ；

Wherein w ₁ is a high-frequency line width, w ₂ is a low-frequency line width, L is a length, and alpha is a preset connection angle.

In an exemplary embodiment, the transition transmission line is of symmetrical construction.

Further, in order to achieve a smooth transition of the impedance from the high-frequency plate region to the low-frequency plate region, the line type of the transition transmission line in the transition region of the transmission line is symmetrically designed, and referring to fig. 3, the length L of the transition transmission line in the transition region needs to satisfyI.e./>。

Of course, the transition transmission line can also adopt the structure shown in fig. 4 and 5, and can be selected according to actual engineering requirements.

In an exemplary embodiment, the process of calculating the high frequency linewidth of the high frequency transmission line and the low frequency linewidth of the low frequency transmission line using the impedance relation includes:

When the type of the transmission line is a differential type, determining a plurality of groups of structural parameters by utilizing an impedance relation, wherein each group of structural parameters comprises a high-frequency line width and a high-frequency line spacing of the high-frequency transmission line and a low-frequency line width and a low-frequency line spacing of the low-frequency transmission line;

Determining a target structure parameter from the plurality of groups of structure parameters;

The process of determining the structure of the transmission line according to the high frequency linewidth, the low frequency linewidth and the length comprises the following steps:

the structure of the transmission line is determined according to the target structure parameters and the length so as to minimize the loss of the transmission line.

In an exemplary embodiment, the types include differential types and the sheet parameters include sheet dielectric constants;

when the type is a differential type, determining that the impedance relation is a second impedance relation, the second impedance relation being ；

Where j=1 or 2, z _j is the impedance value of the target transmission line,The dielectric constant of the plate in the plate area where the target transmission line is located is h, the thickness of the medium between the target transmission line and the plate area is h, t is the metal thickness of the target transmission line, w _j is the line width of the target transmission line, s _j is the line spacing of the target transmission line, when i=1, the target transmission line is a high-frequency transmission line, and when i=2, the target transmission line is a low-frequency transmission line.

It can be understood that the problem of discontinuous impedance of the differential transmission line caused by discontinuous dielectric in the mixed voltage area greatly affects the signal integrity of the high-frequency circuit, and the differential transmission line passes through the low-frequency plate area and the high-frequency plate area simultaneously, and the impedance is changed due to the adverse factors such as discontinuous impedance and discontinuous ground plane caused by discontinuous dielectric, so that reflection and distortion are generated during transmission. Along with the gradual increase of the speed and frequency of the high-speed interconnection signal, the differential transmission line is widely applied to the design of circuit boards, and in order to meet the design requirement of target impedance, the design line width, the line spacing and the dielectric thickness of the differential transmission line are required to be reasonably designed. For high frequency transmission lines, transmission line loss becomes an important factor affecting signal integrity, and transmission line loss can be expressed as the sum of conductor loss and dielectric loss, i.eWhere β represents the loss of the transmission line, f represents the frequency of the signal, w represents the width of the transmission line, z represents the impedance of the transmission line,/>Indicating the dielectric constant of the material,Representing the loss factor of the medium. With increasing frequency, both dielectric loss and conductor loss are increasing, and the specific gravity of dielectric loss exceeds conductor loss and the influence of conductor loss is larger than dielectric loss, and the design factor influencing conductor loss is the width of the transmission line, that is, in a high-speed serial transmission line design, it is necessary to use a line width design as wide as possible. The line pitch of the differential transmission line affects the differential impedance, and the smaller the line pitch, the smaller the differential impedance, and the width of the differential transmission line increases accordingly in order to compensate for the smaller impedance value. In order to meet the design requirement of target impedance, the design line width of the differential transmission line and the line spacing of the differential transmission line need to be designed reasonably.

The differential impedance of the high-frequency transmission line in the high-frequency plate area is as follows:

where s ₁ denotes a line pitch of the differential transmission line of the high-frequency board region.

The differential impedance of the low-frequency transmission line in the low-frequency plate area is as follows:

Where s ₁ denotes the line spacing of the differential transmission lines of the low-frequency board region.

In order to keep the differential impedance unchanged, namely Z ₁=Z₂, the corresponding relation between the line width and the line spacing of the differential transmission lines in the high-frequency plate area and the low-frequency plate area under the condition of unchanged impedance can be calculated according to a differential impedance formula, namely, a plurality of groups of structural parameters can be obtained based on the two relation formulas.

In an exemplary embodiment, the transition transmission line comprises a first differential transition transmission line and a second differential transition transmission line, and determining the target structural parameter from the plurality of sets of structural parameters comprises:

The impedance of the differential transmission line is related to the line width and the line spacing, and the larger the line width, the smaller the loss is, as known from the loss formula of the transmission line. In order to make the differential transmission line have smaller transmission line loss while the differential impedance remains unchanged, an inner chamfer transition structure is selected, which has larger line spacing and line width than an outer chamfer transition structure, as shown in fig. 6.

In an exemplary embodiment, the optimal structural condition relationship is 2w ₁+s₁=2w₂+s₂.

Further, in order to obtain an optimal solution of the line width and the line spacing of the differential transmission line, and simultaneously to realize smooth transition of impedance from a high frequency region to a low frequency region, an internal chamfer transition line type is adopted, and the line width and the line spacing of the differential transmission line satisfy 2w ₁+s₁=2w₂+s₂.

Of course, the differential transmission line may also take the form of a symmetrical transition as shown in fig. 7 or an externally chamfered transition as shown in fig. 8.

In an exemplary embodiment, the type comprises a differential type, and determining the length relation corresponding to the type comprises:

when the type is a differential type, determining that the length relation is a second length relation, wherein the second length relation is ；

Further, in order to realize a smooth transition of the impedance from the high frequency region to the low frequency region, the length L of the transition transmission line of the transition region satisfiesI.e./>。

In summary, the local mixed-voltage structure is adopted on the PCB to meet the transmission requirement of low loss of high-frequency high-speed signals, and the use cost of the high-frequency plate can be reduced, so that the cost in the PCB processing and assembling process is reduced. Because various mediums exist in the high-frequency high-speed local mixed voltage PCB, the problem of discontinuous impedance of the transmission line caused by medium discontinuity can cause signal reflection, and therefore, the discontinuity of the impedance of the transmission line is reduced by optimally designing the transmission line, namely performing line width adjustment and smooth transition design of a transition zone on the single-ended transmission line; the line width and the line interval of the differential transmission line are matched, and the internal oblique cut transition line type is adopted, so that the loss in the transmission process is reduced, the discontinuity of the impedance of the transmission line is reduced, and the signal reflection is reduced; while achieving low cost design of the product on the premise of meeting signal integrity.

In a second aspect, referring to fig. 9, fig. 9 is a transmission line structure determining system provided by the present invention, wherein the transmission line includes a high-frequency transmission line for transmitting signals in a high-frequency plate area, and a low-frequency transmission line for transmitting signals in a low-frequency plate area, the transmission line further includes a transition transmission line having a first end connected to the high-frequency transmission line and a second end connected to the low-frequency transmission line, the high-frequency transmission line and the low-frequency transmission line are both transmission lines with equal line widths, and the transmission line structure determining system includes:

A first determining module 11, configured to determine a high-frequency board parameter of a high-frequency board area and a low-frequency board parameter of a low-frequency board area;

A first calculation module 12 for calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency board parameters and the low-frequency board parameters;

A second calculation module 13, configured to determine a length of the transition transmission line by using the high-frequency line width and the low-frequency line width; the line width of the first end of the transition transmission line is a high-frequency line width, and the line width of the second end of the transition transmission line is a low-frequency line width;

The second determining module 14 is configured to determine the structure of the transmission line according to the high-frequency line width, the low-frequency line width and the length, so that the impedance of the transmission line in the high-frequency board area is continuous with the impedance of the transmission line in the low-frequency board area.

Acquiring the type of a transmission line;

and calculating the high-frequency line width of the high-frequency transmission line and the low-frequency line width of the low-frequency transmission line by using the impedance relational expression and the target condition, wherein the target condition is that the impedance value of the high-frequency transmission line is equal to the impedance value of the low-frequency transmission line.

Acquiring the type of a transmission line;

The length of the transition transmission line is determined based on the length relation.

In a third aspect, referring to fig. 10, fig. 10 is a schematic structural diagram of an electronic device according to the present invention, where the electronic device includes:

A memory 21 for storing a computer program;

a processor 22 for implementing the steps of the transmission line structure determination method as described in any one of the embodiments above when executing a computer program.

Specifically, the memory 21 includes a nonvolatile storage medium and an internal memory 21. The non-volatile storage medium stores an operating system and computer readable instructions, and the internal memory 21 provides an environment for the operating system and computer readable instructions in the non-volatile storage medium to run. When the processor 22 executes the computer program stored in the memory 21, the following steps may be implemented: determining high-frequency plate parameters of a high-frequency plate area and low-frequency plate parameters of a low-frequency plate area; calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency plate parameters and the low-frequency plate parameters; determining the length of the transition transmission line by utilizing the high-frequency line width and the low-frequency line width; the line width of the first end of the transition transmission line is a high-frequency line width, and the line width of the second end of the transition transmission line is a low-frequency line width; the structure of the transmission line is determined according to the high-frequency line width, the low-frequency line width and the length, so that the impedance of the transmission line in the high-frequency plate area is continuous with the impedance of the transmission line in the low-frequency plate area.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: acquiring the type of a transmission line; determining an impedance relational expression corresponding to the type; the impedance relational expression is a relational expression established based on the plate parameters; and calculating the high-frequency linewidth of the high-frequency transmission line and the low-frequency linewidth of the low-frequency transmission line by using the impedance relational expression.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: when the type is single-ended, determining that the impedance relation is a first impedance relation, the first impedance relation being; Wherein i=1 or 2, z _i is the impedance value of the target transmission line,/>The dielectric constant of the plate in the plate area where the target transmission line is located is h, the thickness of the medium between the target transmission line and the plate area is h, t is the metal thickness of the target transmission line, w _i is the line width of the target transmission line, when i=1, the target transmission line is a high-frequency transmission line, and when i=2, the target transmission line is a low-frequency transmission line.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: the transition transmission line is configured to be of a symmetrical structure.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: when the type of the transmission line is a differential type, determining a plurality of groups of structural parameters by utilizing an impedance relation, wherein each group of structural parameters comprises a high-frequency line width and a high-frequency line spacing of the high-frequency transmission line and a low-frequency line width and a low-frequency line spacing of the low-frequency transmission line; determining a target structure parameter from the plurality of groups of structure parameters; the structure of the transmission line is determined according to the target structure parameters and the length so as to minimize the loss of the transmission line.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: when the type is a differential type, determining that the impedance relation is a second impedance relation, the second impedance relation being; Where j=1 or 2, z _j is the impedance value of the target transmission line,/>The dielectric constant of the plate in the plate area where the target transmission line is located is h, the thickness of the medium between the target transmission line and the plate area is h, t is the metal thickness of the target transmission line, w _j is the line width of the target transmission line, s _j is the line spacing of the target transmission line, when i=1, the target transmission line is a high-frequency transmission line, and when i=2, the target transmission line is a low-frequency transmission line.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: acquiring an optimal structural condition relation; the first differential transition transmission line and the second differential transition transmission line corresponding to the optimal structural condition relation are of an internal oblique cutting structure; and determining the structural parameters meeting the optimal structural condition relation in the plurality of groups of structural parameters as target structural parameters.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: and configuring the relation of the optimal structural conditions to be 2w ₁+s₁=2w₂+s₂.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: and calculating the high-frequency line width of the high-frequency transmission line and the low-frequency line width of the low-frequency transmission line by using the impedance relational expression and the target condition, wherein the target condition is that the impedance value of the high-frequency transmission line is equal to the impedance value of the low-frequency transmission line.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: acquiring the type of a transmission line; determining a length relation corresponding to the type; the length relation is a relation established based on the high-frequency line width and the low-frequency line width; the length of the transition transmission line is determined based on the length relation.

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: configuration types include single-ended types; when the type is single-ended, determining that the length relation is a first length relation, wherein the first length relation is; Wherein w ₁ is a high-frequency line width, w ₂ is a low-frequency line width, L is a length, and alpha is a preset connection angle. /(I)

In an exemplary embodiment, the processor 22, when executing the computer subroutine stored in the memory 21, may implement the following steps: when the type is a differential type, determining that the length relation is a second length relation, wherein the second length relation is; Wherein w ₁ is a high-frequency line width, w ₂ is a low-frequency line width, L is a length, and alpha is a preset connection angle.

On the basis of the above embodiment, the electronic device further includes:

The input interface 23 is connected to the processor 22 via the communication bus 26 for obtaining externally imported computer programs, parameters and instructions, which are stored in the memory 21 under control of the processor 22. The input interface 23 may be connected to an input device for receiving parameters or instructions manually entered by a user. The input device can be a touch layer covered on a display screen, or can be a key, a track ball or a touch pad arranged on a terminal shell.

A display unit 24 is coupled to the processor 22 via a communication bus 26 for displaying data transmitted by the processor 22. The display unit 24 may be a liquid crystal display or an electronic ink display, etc.

The network port 25 is connected to the processor 22 via the communication bus 26 for communication connection with external terminal devices. The communication technology adopted by the communication connection can be a wired communication technology or a wireless communication technology, such as a mobile high-definition link technology, a universal serial bus, a high-definition multimedia interface, a wireless fidelity technology, a Bluetooth communication technology, a low-power consumption Bluetooth communication technology, an IEEE802.11 s-based communication technology and the like.

In a fourth aspect, referring to fig. 11, fig. 11 is a schematic structural diagram of a computer readable storage medium according to the present invention, in which a computer program 31 is stored in the computer readable storage medium 30, and the computer program 31 implements the steps of the transmission line structure determining method according to any one of the embodiments described above when executed by a processor.

The computer-readable storage medium 30 may include: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes. The computer-readable storage medium 30 has stored thereon a computer program 31 which, when executed by a processor, performs the steps of: determining high-frequency plate parameters of a high-frequency plate area and low-frequency plate parameters of a low-frequency plate area; calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line based on the high-frequency plate parameters and the low-frequency plate parameters; determining the length of the transition transmission line by utilizing the high-frequency line width and the low-frequency line width; the line width of the first end of the transition transmission line is a high-frequency line width, and the line width of the second end of the transition transmission line is a low-frequency line width; the structure of the transmission line is determined according to the high-frequency line width, the low-frequency line width and the length, so that the impedance of the transmission line in the high-frequency plate area is continuous with the impedance of the transmission line in the low-frequency plate area.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: acquiring the type of a transmission line; determining an impedance relational expression corresponding to the type; the impedance relational expression is a relational expression established based on the plate parameters; and calculating the high-frequency linewidth of the high-frequency transmission line and the low-frequency linewidth of the low-frequency transmission line by using the impedance relational expression.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: when the type is single-ended, determining that the impedance relation is a first impedance relation, the first impedance relation being; Wherein i=1 or 2, z _i is the impedance value of the target transmission line,/>The dielectric constant of the plate in the plate area where the target transmission line is located is h, the thickness of the medium between the target transmission line and the plate area is h, t is the metal thickness of the target transmission line, w _i is the line width of the target transmission line, when i=1, the target transmission line is a high-frequency transmission line, and when i=2, the target transmission line is a low-frequency transmission line.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: the transition transmission line is configured to be of a symmetrical structure.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: when the type of the transmission line is a differential type, determining a plurality of groups of structural parameters by utilizing an impedance relation, wherein each group of structural parameters comprises a high-frequency line width and a high-frequency line spacing of the high-frequency transmission line and a low-frequency line width and a low-frequency line spacing of the low-frequency transmission line; determining a target structure parameter from the plurality of groups of structure parameters; the structure of the transmission line is determined according to the target structure parameters and the length so as to minimize the loss of the transmission line.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: when the type is a differential type, determining that the impedance relation is a second impedance relation, the second impedance relation being; Where j=1 or 2, z _j is the impedance value of the target transmission line,/>The dielectric constant of the plate in the plate area where the target transmission line is located is h, the thickness of the medium between the target transmission line and the plate area is h, t is the metal thickness of the target transmission line, w _j is the line width of the target transmission line, s _j is the line spacing of the target transmission line, when i=1, the target transmission line is a high-frequency transmission line, and when i=2, the target transmission line is a low-frequency transmission line.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: acquiring an optimal structural condition relation; the first differential transition transmission line and the second differential transition transmission line corresponding to the optimal structural condition relation are of an internal oblique cutting structure; and determining the structural parameters meeting the optimal structural condition relation in the plurality of groups of structural parameters as target structural parameters.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: and configuring the relation of the optimal structural conditions to be 2w ₁+s₁=2w₂+s₂.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: and calculating the high-frequency line width of the high-frequency transmission line and the low-frequency line width of the low-frequency transmission line by using the impedance relational expression and the target condition, wherein the target condition is that the impedance value of the high-frequency transmission line is equal to the impedance value of the low-frequency transmission line.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: acquiring the type of a transmission line; determining a length relation corresponding to the type; the length relation is a relation established based on the high-frequency line width and the low-frequency line width; the length of the transition transmission line is determined based on the length relation.

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: configuration types include single-ended types; when the type is single-ended, determining that the length relation is a first length relation, wherein the first length relation is; Wherein w ₁ is a high-frequency line width, w ₂ is a low-frequency line width, L is a length, and alpha is a preset connection angle. /(I)

In an exemplary embodiment, the following steps may be implemented in particular when the computer subroutine stored in the computer readable storage medium 30 is executed by a processor: when the type is a differential type, determining that the length relation is a second length relation, wherein the second length relation is; Wherein w ₁ is a high-frequency line width, w ₂ is a low-frequency line width, L is a length, and alpha is a preset connection angle.

It should also be noted that in this 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. Moreover, 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 one … …" does not exclude the presence of other like 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

1. A transmission line structure determining method, wherein the transmission line includes a high-frequency transmission line transmitting a signal in a high-frequency board area, a low-frequency transmission line transmitting a signal in a low-frequency board area, the transmission line further includes a transition transmission line having a first end connected to the high-frequency transmission line and a second end connected to the low-frequency transmission line, the high-frequency transmission line and the low-frequency transmission line are both transmission lines with equal line widths, the transmission line structure determining method includes:

Acquiring the type of the transmission line;

Determining an impedance relation corresponding to the type; the impedance relational expression is a relational expression established based on board parameters, and the board parameters comprise board dielectric constants;

calculating a high-frequency line width of the high-frequency transmission line and a low-frequency line width of the low-frequency transmission line by using the impedance relational expression; determining a length of the transition transmission line using the type, the high frequency linewidth, and the low frequency linewidth; the line width of the first end of the transition transmission line is the high-frequency line width, and the line width of the second end of the transition transmission line is the low-frequency line width;

2. The transmission line structure determination method according to claim 1, wherein the type includes a single-ended type;

3. The transmission line structure determination method according to claim 2, wherein the transition transmission line is a symmetrical structure.

4. The transmission line structure determination method according to claim 1, wherein the process of calculating the high-frequency line width of the high-frequency transmission line and the low-frequency line width of the low-frequency transmission line using the impedance relational expression includes:

5. The transmission line structure determination method according to claim 4, wherein the type includes a differential type;

6. The transmission line structure determination method according to claim 5, wherein the transition transmission line includes a first differential transition transmission line and a second differential transition transmission line, and determining the target structure parameter among the plurality of sets of the structure parameters includes:

7. The transmission line structure determination method according to claim 6, wherein the optimal structural condition relation is 2w ₁+s₁=2w₂+s₂.

8. The transmission line structure determination method according to claim 1, wherein the process of calculating the high-frequency line width of the high-frequency transmission line and the low-frequency line width of the low-frequency transmission line using the impedance relational expression includes:

9. The transmission line structure determination method according to any one of claims 1 to 8, wherein the process of determining the length of the transition transmission line using the type, the high-frequency line width, and the low-frequency line width includes:

10. The transmission line structure determination method according to claim 9, wherein the type includes a single-ended type, and the process of determining a length relation corresponding to the type includes:

11. The transmission line structure determination method according to claim 9, wherein the type includes a differential type, and the process of determining a length relation corresponding to the type includes:

12. A transmission line structure determining system, characterized in that the transmission line includes a high-frequency transmission line that transmits signals in a high-frequency board area, a low-frequency transmission line that transmits signals in a low-frequency board area, the transmission line further includes a transition transmission line having a first end connected to the high-frequency transmission line and a second end connected to the low-frequency transmission line, the high-frequency transmission line and the low-frequency transmission line are both transmission lines of equal line width, the transmission line structure determining system comprising:

the first calculation module is used for obtaining the type of the transmission line, determining an impedance relational expression corresponding to the type, and calculating the high-frequency line width of the high-frequency transmission line and the low-frequency line width of the low-frequency transmission line by utilizing the impedance relational expression; the impedance relational expression is a relational expression established based on board parameters, and the board parameters comprise board dielectric constants;

a second calculation module for determining a length of the transition transmission line using the type, the high frequency linewidth, and the low frequency linewidth; the line width of the first end of the transition transmission line is the high-frequency line width, and the line width of the second end of the transition transmission line is the low-frequency line width;

13. An electronic device, comprising:

A memory for storing a computer program;

A processor for implementing the steps of the transmission line structure determination method according to any one of claims 1-11 when executing said computer program.

14. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, implements the steps of the transmission line structure determination method according to any of claims 1-11.