CN210272740U

CN210272740U - Board-to-board connection circuit capable of supporting 10G differential signal transmission at most

Info

Publication number: CN210272740U
Application number: CN201921389344.0U
Authority: CN
Inventors: 熊伟; 李文成
Original assignee: 3onedata Co ltd
Current assignee: 3onedata Co ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2020-04-07
Anticipated expiration: 2029-08-26

Abstract

The utility model provides a board to board connecting circuit that can support 10G differential signal transmission at most, first PCB board, second PCB board, an at least earth connection and at least two sets of winding displacement, the one end of two sets of winding displacements all is connected with first PCB board, and the other end of two sets of winding displacements all is connected with the second PCB board, and first PCB board and second PCB board are mutual through two sets of winding displacement signals, and is provided with the earth connection between every group winding displacement and keeps apart, the one end and the first PCB board of earth connection are connected mutually, and the other end and the second PCB board of earth connection are connected mutually, and every group winding displacement includes two differential signal lines, and one of them differential signal line transmission forward signal, another differential signal line transmission reverse signal. The transmission of high-speed signals between two PCB boards is realized by using the flat cable, the connection mode is simple and direct, the cost is low, the accompanying processing is particularly added between high-speed signal pairs or between the high-speed signals and other signals, the interference of the other signals to the high-speed signals is reduced to the greatest extent, and meanwhile, a return path is provided for the high-speed signals.

Description

Board-to-board connection circuit capable of supporting 10G differential signal transmission at most

Technical Field

The utility model relates to a signal transmission technical field especially relates to a differential signal transmission's board is to board connecting circuit.

Background

With the development of communication technology, the demand of switch equipment with higher communication speed gradually increases, and in practical design, some situations that require board-to-board high-speed signal connection are encountered, and signal transmission needs media, and different transmission media have different characteristics, and the different characteristics of the media have great influence on data communication quality and communication speed in a network.

The prior art discloses a detachable mixed-loading type board-to-board connector (application number: 201520959002.3), wherein the connector at least comprises a first signal connector and a second signal connector, and the first signal connector and the second signal connector are respectively provided with a butt joint structure which is detachably connected with each other. Through the type according to the connector or the difference of connecting the demand, set up detachable butt joint structure each other respectively for all kinds of connectors can make up the use according to the demand, have reduced the connection responsibility degree between the PCB board, also simultaneously because can make up the mode of using according to the demand and make the cost reduce, its space that occupies has also reduced a lot after the combined use.

The traditional connection mode adopts a connector, a pin header, a high-speed flat cable and the like, but the via holes, the connector and the like on a common PCB have certain attenuation to high-speed signals, the total number of the allowed via holes is determined by the performance of the high-speed signals to be less than 2, and the signal attenuation degree is generally less than 6 dB. Traditional row's needle passes through via hole welded fastening, needs 2 via holes at least, and the shielding layer can't be done because of structural constraint to general row's needle winding displacement simultaneously, and the technological restriction in addition leads to arranging the needle interval and hardly accomplishing within 1mm, and the impedance is hardly controlled, and signal attenuation is big, and need punch welded fastening, can produce the tail, consequently walks the line and makes high-speed signal receive the interference of irrelevant signal easily.

Disclosure of Invention

To the weak point that exists in the above-mentioned technique, the utility model provides a board that can support 10G differential signal transmission to board connecting circuit the highest, this connecting circuit simple structure utilizes the winding displacement that has the shielding layer to realize that the board that can support 10G differential signal transmission is connected to the board, and the interference killing feature is strong, low cost.

To achieve the above object, the present invention is implemented as follows:

the utility model provides a board to board connecting circuit that can support transmission of 10G differential signal the most, its characterized in that it includes first PCB board, second PCB board, an at least earth connection and at least two sets of winding displacement, the one end of two sets of winding displacement all is connected with first PCB board, and the other end of two sets of winding displacement all is connected with the second PCB board, and first PCB board and second PCB board are mutual through two sets of winding displacement signals, and is provided with the earth connection between every group winding displacement and keeps apart, the one end of earth connection is connected with first PCB board, and the other end of earth connection is connected with the second PCB board, and every group winding displacement includes two differential signal lines, and one of them differential signal line transmission forward signal, another differential signal line transmission reverse signal.

The board-to-board connection circuit is mainly realized by using flat cables, the flat cables are simple and direct in wiring mode and low in cost, and are particularly suitable for high-speed (10G) signals, accompanying processing is added between high-speed signal pairs or between high-speed signals and other signals, interference of the other signals on the high-speed signals is reduced to the greatest extent, and meanwhile, a return path is provided for the high-speed signals.

Differential transmission is a signal transmission technology, and is different from a traditional method of one signal wire and one ground wire, wherein differential transmission transmits signals on the two wires, the amplitudes of the two signals are equal, the phases of the two signals are opposite, and the signals transmitted on the two wires are differential signals. The signal receiving end compares the difference value of the two voltages to judge whether the transmitting end sends logic 0 or logic 1.

Further, the flat cable is an FFC or an FPC. The FFC and the FPC are selected as the connecting flat cable, and the connecting flat cable has the following advantages: 1. the wiring density is high, the space between the wires is small, differential wires can be conveniently taken, and the design without via holes and tail wires can be realized by matching with an FPC patch row seat; 2. the impedance is small, and the impedance matching of the differential line is easy to realize; 3. the bending property is good, and the pin header can be flexibly installed relative to the pin header; 4. the upper and lower shielding layers of the flat cable make the flat cable not easy to be interfered by external signals, and the flat cable can more easily meet the requirement of transmitting high-speed signals, such as 10G signals, under the conditions of matching and controlling the length of the flat cable and accompanying processing.

Further, the flat cables are all arranged between the first PCB and the second PCB in parallel. The flat cables between the first PCB and the second PCB are arranged in parallel, the length of the flat cables can be shortened as much as possible, and on the circuit board, the routing of the differential signal lines needs to be two lines which are equal in length, equal in width, close to each other and on the same layer.

The utility model has the advantages of, utilize the transmission of high-speed signal between two PCB boards that the winding displacement realized, connected mode is simple, direct, with low costs, has still increased between high-speed signal is to or between high-speed signal and other signals very much and has been dealt with the company, and other signals of minimizing also provide the backward flow route for high-speed signal simultaneously.

Drawings

Fig. 1 is a schematic diagram of board-to-board connection circuitry in an embodiment.

Fig. 2 is a schematic diagram of the connection of multiple groups of flat cables and ground wires in the embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Reference is made to fig. 1-2.

A board-to-board connection circuit capable of supporting 10G differential signal transmission at most comprises a first PCB (printed circuit board) 1, a second PCB 2, at least one grounding wire and at least two groups of flat cables 3, wherein the first PCB 1 is connected with a switching chip (not shown), a part of an interface (not shown) of a high-speed signal is connected to the second PCB, then one flat cable 3 is selected to connect the first PCB 1 and the second PCB 2, one end of the flat cable 3 is connected with the first PCB 1, the other end of the flat cable 3 is connected with the second PCB 2, the first PCB 1 and the second PCB 2 are in signal interaction through the two groups of flat cables 3, a grounding wire isolation is arranged between each group of flat cables 3, one end of the grounding wire is connected with the first PCB 1, the other end of the grounding wire is connected with the second PCB, each group of flat cables comprises two differential signal wires, wherein one differential signal wire transmits a forward signal, the other differential signal line transmits a reverse signal.

Referring to fig. 1, a schematic diagram of a board-to-board connection circuit of the flat cable 3 is shown, the width of the flat cable 3 is designed to ensure that at least the differential signal lines to be connected are completely routed, and at the same time, the signal ground separation between the 3 line pairs of each flat cable group is required to increase the signal interference resistance,

in this embodiment, the flat cable 3 is an FFC or an FPC. The selected FFC or FPC flat cable has the advantages of high wiring density, small impedance and the like, and the requirement of transmitting high-speed signals can be met more easily under the conditions of well controlling the length of the flat cable and accompanying processing.

In this embodiment, the flat cables 3 are all arranged in parallel between the first PCB 1 and the second PCB 2, and the two differential signal lines of each flat cable group are equal in length, equal in width, and closely adjacent to each other and on the same plane.

Referring to fig. 2, a schematic connection diagram of multiple groups of flat cables and ground wires is shown, where TX1+ and TX 1-are differential signals of TX1, RX1+ and RX 1-are differential signals of RX1, and the total length of the PCB wiring plus the flat cables does not exceed the requirement of the switching chip specification on the trace length of the signal wires. The cable transmission performance is also considered to be free from interference of other factors (such as far away from the on-board power supply part) in the overall design, and the reasonability and stability of installation are also considered.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a board to board connecting circuit that can support transmission of 10G differential signal the most, its characterized in that it includes first PCB board, second PCB board, an at least earth connection and at least two sets of winding displacement, the one end of two sets of winding displacement all is connected with first PCB board, and the other end of two sets of winding displacement all is connected with the second PCB board, and first PCB board and second PCB board are mutual through two sets of winding displacement signals, and is provided with the earth connection between every group winding displacement and keeps apart, the one end of earth connection is connected with first PCB board, and the other end of earth connection is connected with the second PCB board, and every group winding displacement includes two differential signal lines, and one of them differential signal line transmission forward signal, another differential signal line transmission reverse signal.

2. The board-to-board connection circuit capable of supporting 10G differential signal transmission according to claim 1, wherein the flat cable is FFC or FPC.

3. The board-to-board connection circuit capable of supporting up to 10G differential signal transmission according to claim 1, wherein the flat cables are disposed in parallel between the first PCB and the second PCB.

4. The circuit of claim 3, wherein the two differential signal lines of each group of flat cables are equal in length, equal in width, and closely adjacent and on the same plane.