PLUG CONNECTOR AND COMPONENT

Abstract

A plug connector which comprises contact elements that are subdivided into at least one signal contact element and at least one shielding contact element, and a component having an electrical circuit ground. The plug connector and the component are characterized by an ohmic resistance which connects the shielding contact element to the electrical circuit ground. The measure suppresses parasitic oscillations.

Claims

1: Plug connector that has contact elements that are divided into at least one signal contact element (12, 18a, 18b) and at least one shielding contact element (14, 20, 22), and a first component (40) having a first electrical circuit ground (30), wherein an ohmic resistor (26, 28, 62) is provided that connects the shielding contact element (14, 20, 22) to the first electrical circuit ground (30).

2: Plug connector according to claim 1, wherein the resistance value of the ohmic resistor (26, 28, 62) corresponds to the surge resistance of a signal wire guided across the plug connector (10).

3: Plug connector according to claim 1, wherein the resistance value of the ohmic resistor (26, 28, 62) ranges from 20-100 ohms.

4: Plug connector according to claim 3, wherein the resistance value of the ohmic resistor (26, 28, 62) amounts to at least approximately 50 ohms.

5: Plug connector according to claim 1, wherein the ohmic resistor (26, 28, 62) is in each case allocated exactly to a shielding contact element (14, 20, 22).

6: Plug connector according to claim 1, wherein an ohmic resistor (62) is allocated to several shielding contact elements (20, 22) and the shielding contact elements (20, 22) are directly electrically connected to one another.

7: Plug connector according to claim 1, wherein the plug connector (10) has a shielding (32, 34) and the shielding (32, 34) is provided to directly connect to the first electrical circuit ground (30).

8: Plug connector according to claim 1, wherein the at least one ohmic resistor (26, 28, 62) is arranged in the plug connector (10).

9: Plug connector according to claim 1, wherein the at least one ohmic resistor (26, 28, 62) is allocated to the first component (40).

10: Plug connector according to claim 1, wherein the first component (40) is a circuit board.

11: Plug connector according to claim 10, wherein the circuit board is a multi-layer circuit board and a layer of the multi-layer circuit board has at least partially an electrical conductive surface (42) having the potential of the first electrical circuit ground (30).

12: Plug connector according to claim 10, wherein a plug connector (10′) corresponding to the plug connector (10) has contact elements that are divided into at least one signal contact element (12, 18a′, 18b′) and at least one shielding element (14′, 20,′ 22′), and a second component (40′) having a second electrical circuit ground (30′), wherein at least one corresponding shielding contact element (14′, 20′, 22′) of the corresponding plug connector (10′) is connected to a second electrical circuit ground (30′) via an electrical resistor (26′, 28′, 62′).

13: Plug connector according to claim 12, wherein with plug connectors contacting each other (10, 10′), the first electrical circuit ground (30) and the second electrical circuit ground (30′) are directly electrically connected to each other.

14: Plug connector according to claim 12, wherein the second component (40′) is a backplane circuit board.

15: Use of the plug connector (10) and of the first component (40) according to claim 1 and/or of the corresponding plug connector (10′) and of the second component (49′), in which adjacent contact elements (18a, 18b, 18a′, 18b′) form a signal contact element pair (16) and in which at least one shielding contact element (20, 22, 20′, 22′) is allocated to the signal contact element pair (16).

16: Use according to claim 15, in which the signal contact element pair (16) guides differential signals.

Description

SHORT DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0027] The exemplary embodiments are explained in more detail by the drawing.

[0028] FIG. 1 schematically shows an aerial view of one layout of a plug connector,

[0029] FIG. 2 shows the plug connector before contacting with a component and a corresponding plug connector in the plugged together state,

[0030] FIG. 3 shows the arrangement shown in FIG. 2, in which the corresponding plug connector is depicted before contacting with a second component,

[0031] FIG. 4 shows an alternative exemplary embodiment of the arrangement shown in FIG. 2 and

[0032] FIG. 5 shows an alternative exemplary embodiment of the arrangement shown in FIG. 3.

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0033] FIG. 1 schematically shows an aerial view of one layout of a plug connector 10 that has at least two contact elements, preferably however a multitude of contact elements. The contact elements are divided up into at least one signal contact element and at least one shielding contact element. For example, a signal contact element 12 can be provided that is arranged to be adjacent to a shielding contact element 14.

[0034] In the depiction shown in FIG. 1, a symbol, such as a plus sign for example, should denote a signal contact element 12 and a hatching should denote a shielding contact element 14.

[0035] The shown signal contact element 12 and the adjacent shielding contact element 14 are provided to connect a signal guiding wire that is not shown, wherein the signal guiding wire can have a signal wire connected to the signal contact element 12 and a shielding wire connected to the shielding contact element 14.

[0036] The plug connector 10 can preferably be used for connecting signal guiding wires that contain at least one pair of signal guiding wire that is connected to a signal contact element pair 16 that comprises two directly adjacently arranged signal contact elements 18a, 18b. The signal contact element pair 16 is preferably used for connecting differential signals that are characterised by a plus symbol and by a minus symbol in FIG. 1. Such a differential signal has, in terms of a central level, for example a positive level on the one signal contact element (plus) and at the same time a negative level on the adjacent signal contact element (minus) of the signal contact element pair 16. The level changes in a push-pull manner with the signal frequency.

[0037] The signal guiding wire not shown that is connected to the signal contact element pair 16 contains at least one shielding wire, wherein, in the shown exemplary embodiment, two shielding wires should be provided that are to be connected in each case to a shielding contact element 20, 22. The shielding contact elements 20, 22 are preferably arranged directly adjacently with respect to the associated signal contact element pair 16 in order to achieve the best shielding effect.

[0038] It is provided according to the invention that at least one shielding contact element 14, 20, 22 is not connected directly to a first electrical circuit ground 30, but rather via an ohmic resistor 24, 26, 28. In the shown exemplary embodiment, along with the one shielding contact element 14, the shielding contact elements 20, 22 allocated to the signal contact element pair 16 are also connected in each case via an ohmic resistor 26, 28 to the first electrical circuit ground 30.

[0039] It should be noted that not every shielding contact element 14, 26, 28 of the connector plug 10 has to be connected to the electrical circuit ground 30 via an ohmic resistor, but can also be connected directly to the first electrical circuit ground 30.

[0040] The first electrical circuit ground 30 is present in a first component not shown in more detail in FIG. 1, the plug connector 10 either already being soldered to said component or is to be soldered as part of a mounting process.

[0041] The ohmic resistor 24, 26, 28 can be arranged within the plug connector 10. Alternatively or additionally, the ohmic resistor 24, 26, 28 can also be arranged on the first component.

[0042] Preferably, high frequency signals, for example digital differential signals, are broadcast via the connector plug 10, the data rate of said signals being able to be in the region of up to 20 gigabytes/second for example. K, corresponding to a base frequency of 20 gigahertz.

[0043] Based on experiments on practical plug connections that are supplied with very high data rates, it has been shown that, with direct contact of the shielding contact element 14, 20, 22 by the first electrical circuit ground 30, parasitic oscillations can arise which are in the frequency region of 17-18 gigahertz for example. Such a resonance point in a plug connection can disadvantageously influence the signal-broadcast ratio via the plug connector 10.

[0044] The unwanted resonance can be guided back along the length of the signal path in the plug connector 10. The previously mentioned resonance frequency in the region of around 17-18 gigahertz corresponds to a surge length of around 10 millimetres on the assumption that the effective relative dielectricity constant amounts to around 2.8. The plastics used for the plug connector 10 can have such a dielectricity constant. With an assumed design height of the plug connector 10 of 5 millimetres, the design height at least approximately corresponds to half the surge length and can therefore explain the emergence of the resonance.

[0045] The parasitic oscillations do not only influence the signal-broadcast ratio via the related signal contact element 12, 18a, 18b, but also adjacent signal contact elements because of the electro-magnetic expansion inside the plug connector 10 and should therefore also be avoided for this reason.

[0046] It has been found in a calculated and experimental manner that the ohmic resistor according to the invention 24, 26, 28 that is inserted between the shielding contact element 14, 20, 22 and the first electrical circuit ground 30 works as a damping resistor and extensively gets rid of the energy of the electrical oscillation at the resonance frequency that is emerging, such that the disturbing resonance frequency cannot form.

[0047] The resistance value of the ohmic resistor 24, 26, 28 is preferably in the region between 20-100 ohms. According to a special exemplary embodiment, the resistance value of the ohmic resistor 24, 26, 28 can amount to at least approximately 50 ohms. In particular, a resistance value of the ohmic resistor 24, 26, 28 that corresponds to the surge resistance of the signal wire guided via the plug connector 10 is suitable. Details for determining the capacitance coating and the inductance coating of the plug connector 10 and the surge resistance can be found in the reference book by Meinke and Gundlach stated at the beginning, in particular pages 14, 18 and 165.

[0048] The plug connector 10 preferably has a shielding 32, 34 that is directly connected to the first electrical circuit ground 30. In the shown exemplary embodiment it is assumed, for example, that the plug connector 10 has such a shielding 32, 34 on both sides and both shieldings 32, 34 are directly connected to the first electrical circuit ground 30.

[0049] Along with the plug connector shown in FIG. 1, FIG. 2 shows an exemplary embodiment of the first component 40 that is a plate, for example, with which the plug connector 10 is contacted during the mounting procedure. The first electrical circuit ground 30 is allocated to the first component 40.

[0050] The components shown in FIG. 2 that are identical to the components shown in FIG. 1 are in each case provided with the same reference sign. This agreement also applies to the following FIGS. 3-5.

[0051] According to FIG. 2, as an exemplary embodiment of the first component 40, the circuit board can be implemented as a multi-layer circuit board, for example. In doing so, the first electrical circuit ground 30 can preferably be implemented as an electrically conductive layer 42 on one of the layers of the multi-layer circuit board such that the first electric circuit ground 30 has a shielding effect at the same time.

[0052] If the ohmic resistor 24, 26, 28 is to be arranged on the first component 40 outside the plug connector 10, the ohmic resistor 24, 26, 28 is preferably positioned on the uppermost layer of the circuit board and is connected on one side to contact surfaces 46, 48 and on the other side to the first electrical circuit ground 30 via as short connection wires 44 as possible.

[0053] In the shown exemplary embodiment the two shieldings 32, 34 of the plug connector 10 are also to contact the contact surfaces 50, 52 or are already in contact with them, wherein the contact surfaces 50, 52 are also preferably connected to the first electrical circuit ground 30 on the shortest possible path via the connection wires 44,

[0054] In the exemplary embodiment shown in FIG. 2, a plug connector 10′ corresponding to the plug connector 10 is shown, the former being depicted in the state of being inserted into the plug connector 10.

[0055] FIG. 3 shows an exemplary embodiment according to which a second component 40′, preferably also a circuit board, can also be allocated to the corresponding plug connector 10′. The second component 40′ can again be implemented as a multi-layer circuit board. FIG. 3 also shows here a state in which the corresponding plug connector 10′ is not yet in contact with the second component 40′, for example by means of soldering.

[0056] The corresponding plug connector 10′ should contain at least one corresponding contact element 12′ and one corresponding shielding contact element 14′. Preferably, the corresponding plug connector 10′, however, contains a multitude of contact elements, including at least one corresponding signal contact pair 16′ that contains corresponding signal contact elements 18a′, 18b′, said contact pair being positioned to be adjacent to at least one corresponding shielding contact element 20′, 22′.

[0057] Also, in the corresponding plug connector 10′, the at least one corresponding shielding contact element 14′, 20′, 22′ is not directly connected to a second electrical circuit ground 30′, but also respectively via an ohmic resistor 26′, 28′. In this case, the second electrical circuit ground 30′ is allocated to the second component 40′.

[0058] It can also be provided in this exemplary embodiment that the ohmic resistor 26′, 28′ is arranged inside the second plug connector 10′. Preferably however, the ohmic resistor 26′, 28′ is provided on the second component 40′ in this exemplary embodiment too.

[0059] In one implementation of the second component 40′ as a multi-layer circuit board, the second electrical circuit ground 30′ can again be formed on a separate layer of the multi-layer plate as a larger electrically conductive surface 42′ in order to also achieve a shielding effect in the second component 40′.

[0060] If the ohmic resistor 24, 26, 28 is to be arranged outside the corresponding plug connector 10′ on the second component 40′, the ohmic resistor 24′, 26′, 28′ is preferably again positioned on the uppermost layer of the circuit board and connected on one side to contact surfaces 46′, 48′ and on the other side to the second electrical circuit ground 30′ by as short connection wires as possible.

[0061] According to the shown exemplary embodiment, the corresponding plug connector 10′ can also have corresponding shieldings 32′, 34′ that are to contact the contact surfaces 50′, 52′ on the second component 40′ or are already in contact with them, wherein the contact surfaces 50′, 52′ are also again preferably connected on the shortest possible path to the second electrical circuit ground 30′ via connection wires 44′.

[0062] In the exemplary embodiment shown in FIG. 3, in which at least one ohmic resistor 26′, 28′ or a second electrical circuit ground 30′ is also allocated to the corresponding plug connector 10′, it is assumed that the first electrical circuit ground 30 of the first component 40 has the same potential as the second electrical circuit ground 30′ on the second component 40′. To carry out the potential compensation it can be provided that at least one contact element of the plug connector 10 or of the corresponding plug connector 10′ is provided for directly connecting the first electrical circuit ground 30 and the second electrical circuit ground 30′. Purely in principle, the potentials of the first and second electrical circuit ground 30, 30′ could deviate from each other, however, in practice, the circuit grounds 30, 30′ should be the same as far as possible.

[0063] FIG. 4 shows an embodiment that is an alternative to the exemplary embodiment shown in FIG. 2, according to the former embodiment at least two shielding contact elements 20a, 20b are directly electrically connected to each other by means of a connection 60, and wherein the shielding contact elements 20a, 20b connected to each other are connected to the first electrical circuit ground 30 via a single ohmic resistor 62. The electrical connection 60 can be inside the plug connector 10. Alternatively, the connection 60 between the at least two shielding contact elements 20a, 20b can be provided on the first component 40 that is no longer shown in FIG. 4. Likewise, the ohmic resistor 62 can be arranged for coupling the connection 60 to the first electrical circuit ground 30, either still in the plug connector 10, preferably however on the first component 40.

[0064] FIG. 5 shows an embodiment that is an alternative to the exemplary embodiment shown in FIG. 3, according to which former embodiment at least two corresponding shielding contact elements 20′, 22′ are directly electrically connected to each other by means of a connection 60′ and wherein the directly corresponding shielding contact elements 20′, 22′ that are electrically connected to one another are connected to the second electrical circuit ground 30′ via one single ohmic resistor 62′.

[0065] The electrical connection 60′ can be inside the corresponding plug connector 10′. Alternatively, the connection 60′ between the at least two shielding contact elements 20′, 22′ can be provided on the second component 40′ no longer shown in FIG. 4. Likewise, the ohmic resistor 62′ can be arranged for coupling the connection 60′ to the second electrical circuit ground 30′ either still in the corresponding plug connector 10′, preferably however on the second component 40′.