Lead space converter

Abstract

The embodiment of the utility model discloses a lead space converter, comprising a circuit board, the top surface of which is provided with a test contact; the insulating fixed seat is fixed on the bottom surface of the circuit board; one end of the signal line is electrically connected with the test contact, and the other end of the signal line is electrically connected with a probe of a probe card to be tested through the insulating fixing seat; the surface of each signal line is coated with the first grounding shielding piece, one end of the first grounding shielding piece is connected with a test grounding point arranged on the top surface of the circuit board, and the other end of the first grounding shielding piece is connected with the insulating fixed seat; the surface of the signal line is coated with the first grounding shielding piece, so that the grounding shielding layer is established beside the signal line and shields the signal line, the external signal interference on the circuit test signal is reduced, and the stability and reliability of the signal in the test process are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of semiconductor wafer testing, in particular to a lead space converter. Background Art

[0002] The Wi re Space Transformer (WST) is a precision interface adapter between the automatic test system and the probe card, used to test the functional parameters of semiconductor chips before packaging.

[0003] The current wire space transformer WST (Wire Space Transformer) is as follows Figure 1 As shown, it includes an insulating fixing ring 1', an insulating fixing ring 2', a plurality of signal metal wires 3', an insulating adhesive 4', a test contact 5' and a circuit board 6'. The plurality of signal metal wires 3' are fixed between the insulating fixing rings 1' and 2' by the insulating adhesive 4', and the plurality of signal wires 3' are coated with a dielectric material to isolate and insulate each other. One end of each signal metal wire 3' is electrically connected to an external test machine through the test contact 5', and the other end of the signal metal wire 3' is directly electrically connected to the needle tail of the probe. This type of wire space transformer (WST) can usually only be used for low-frequency range tests with low requirements. When used for complex test items, the interference of the transmission signal will lead to poor integrity of the transmission signal. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a lead space converter to reduce the external signal interference of the circuit test signal and improve the stability and reliability of the signal during the test process.

[0005] Specifically, the utility model provides a lead space transformer, comprising:

[0006] A circuit board, wherein a test contact is provided on the top surface of the circuit board;

[0007] An insulating fixing seat, the insulating fixing seat is fixed to the bottom surface of the circuit board;

[0008] A signal line, one end of which is electrically connected to the test contact, and the other end of which is electrically connected to the probe via the insulating fixing seat;

[0009] A first grounding shielding member, the surface of each of the signal lines is covered with the first grounding shielding member, one end of the first grounding shielding member is connected to a test grounding point arranged on the top surface of the circuit board, and the other end is connected to the insulating fixing seat.

[0010] Based on the lead space converter provided above, a first ground shielding member is coated on the surface of the signal line, thereby establishing a ground shielding layer next to the signal line to shield the signal line, thereby reducing external signal interference on the circuit test signal and improving the stability and reliability of the signal during the test process.

[0011] In one embodiment of the above-mentioned lead space transformer, the lead space transformer further comprises:

[0012] a second grounding shielding member, the second grounding shielding member comprising a grounding metal foil fixed to the bottom end of the insulating fixing seat;

[0013] One end of the first grounding shielding component is connected to a test grounding point arranged on the top surface of the circuit board, and the other end is connected to the grounding metal foil; the second grounding shielding component cooperates with the first shielding component to more fully shield interference from external signals and further improve the stability and reliability of the signal during the test process.

[0014] In one embodiment of the lead space transformer, the first ground shielding member comprises a metal tube, and the signal line is inserted into the metal tube; the metal tube is placed on the signal line to achieve ground shielding, so as to shield interference from external signals.

[0015] In one embodiment of the lead space converter described above, the first grounding shielding component includes an insulated wire, and the surface of each of the signal wires is wrapped with the insulated wire that shields the outer surface of the signal wire; the insulated wire covering the surface of the signal wire is wrapped on the surface of the signal wire to form a grounding shielding layer covering the surface of the signal wire, thereby shielding interference from external signals.

[0016] In one embodiment of the lead space transformer, the grounded metal foil covers the connection surface between the grounded metal foil and the insulating fixing seat; the more fully the grounded metal foil covers, the more fully the signal line can be shielded, thereby reducing the interference from external signals, thereby improving the stability and reliability of the signal during the test process.

[0017] In one embodiment of the lead space converter described above, the insulating fixing seat is provided with transfer holes corresponding to the number and size of the test target signal;

[0018] A signal line and an insulated wire wound around the signal line are passed through each of the transfer holes;

[0019] Each of the signal lines and the insulating wires wound thereon pass through one of the transfer holes, so as to avoid contact and mutual interference between adjacent signal lines and insulating wires.

[0020] In one embodiment of the lead space transformer described above, the insulating fixing seat comprises a ceramic ring, an opening of the ceramic ring is filled with an insulating adhesive, and the signal line and the first grounding shielding member are fixed in the opening of the ceramic ring by the insulating adhesive; the signal line is fixed by the insulating adhesive to prevent the signal lines from contacting and interfering with each other.

[0021] In one embodiment of the lead space converter described above, the insulating fixing seat is detachably connected to the circuit board; the openings on the insulating fixing seat correspond to the number and size of the signals required for the test, and the insulating fixing seat is detachably connected to the circuit board to facilitate replacement according to test requirements.

[0022] In one embodiment of the lead space converter described above, a conductive member is provided between the insulating fixing seat and the probe, and the conductive member is electrically connected to the signal line and the probe respectively; the insulating fixing seat itself has good insulation, and the signal line needs to be electrically connected to the probe of the probe card via the conductive member.

[0023] In one embodiment of the lead space transformer, the conductive element comprises a metal layer, and the metal layer is plated on the bottom surface of the insulating fixing seat.

[0024] One or more of the above-mentioned embodiments of the utility model have at least one or more of the following beneficial effects: a ground shielding layer is established next to the signal line to shield the signal line, thereby reducing the interference of external signals on the circuit test signal, improving the stability and reliability of the signal during the test process, and facilitating maintenance.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention.

[0027] Additionally, like numerals are used to denote like parts in the drawings, wherein:

[0028] Figure 1 It is a schematic diagram of the structure of a lead space converter in the prior art;

[0029] Figure 2 It is a structural schematic diagram of a lead space converter provided by an embodiment of the utility model.

[0030] Description of Reference Numerals

[0031] Among them: 1', insulating fixing ring; 2', insulating fixing ring; 3', metal wire; 4', insulating adhesive; 5', test contact; 6', circuit board; 1, circuit board; 2, test contact; 3, insulating fixing seat; 31, first ceramic ring; 32, second ceramic ring; 4, signal line; 5, first grounding shield; 6, test grounding point; 7, second grounding shield; 8, insulating adhesive. DETAILED DESCRIPTION

[0032] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0033] As described in the background technology, the current lead space converter is usually only used for low-frequency range tests with low requirements because the line from the needle tail of the probe to the test contact of this lead space converter is usually only used for low-frequency range tests. When performing complex test items, the interference of the transmission signal will lead to poor integrity of the transmission signal. In order to solve the problem of interference of the transmission signal in the above-mentioned lead space converter, the utility model provides a lead space converter, which covers the surface of the signal line with a first ground shielding member, thereby establishing a ground shielding layer next to the signal line to shield the signal line, which can ensure that the signal is less interfered by the outside world and has less loss when passing through the probe card, and can effectively reduce the impact of external signal interference on the circuit, ensure the integrity of the transmission signal, and improve the stability and reliability of the circuit during the test process.

[0034] The present invention will be described in detail below through specific embodiments.

[0035] Embodiment 1: This embodiment provides a lead space transformer, including:

[0036] Circuit board 1, electronic circuits are arranged on the circuit board 1, and test contacts 2 are arranged on the top surface of the circuit board 1, and the test contacts 2 are electrically connected to the test machine; insulating fixing seat 3, the insulating fixing seat 3 is fixed to the bottom surface of the circuit board 1; signal line 4, one end of the signal line 4 is electrically connected to the test contact 2, and the other end is electrically connected to the probe of the probe card to be tested (not shown) through the insulating fixing seat 3; first grounding shield 5, the surface of each signal line 4 is covered with the first grounding shield 5, one end of the first grounding shield 5 is connected to the test grounding point 6 arranged on the top surface of the circuit board 1, and the other end is connected to the insulating fixing seat 3. Specifically, the end of the signal line 4 is electrically connected to the tail of the probe.

[0037] Based on the lead space converter provided above, a first ground shielding member is coated on the surface of the signal line, thereby establishing a ground shielding layer next to the signal line to shield the signal line, thereby reducing external signal interference on the circuit test signal and improving the stability and reliability of the signal during the test process.

[0038] In one embodiment of the above-mentioned lead space transformer, the lead space transformer further comprises:

[0039] The second grounding shielding member 7 includes a grounding metal foil fixed to the bottom end of the insulating fixing seat 3; one end of the first grounding shielding member 5 is connected to the test grounding point 2 set on the top surface of the circuit board 1, and the other end is connected to the grounding metal foil; the second grounding shielding member 7 cooperates with the first shielding member 5 to more fully shield the interference of external signals and further improve the stability and reliability of the signal during the test. Specifically, the grounding metal foil is set according to the number, properties and size of the actual holes on the insulating fixing seat 3, and the grounding metal foil is fixed to the bottom of the insulating fixing seat 3 by an insulating adhesive 8. Exemplarily, the grounding metal foil is a grounding copper foil. The insulating adhesive 8 has fluidity before curing, and will fill the cavity in the insulating fixing seat 3 to play a fixing role, and fix the grounding copper foil to the bottom end of the insulating fixing seat 3.

[0040] In one embodiment of the lead space converter described above, the first ground shielding member 5 includes an insulated wire, and the surface of each of the signal wires 4 is wrapped with the insulated wire that shields the outer surface of the signal wire 4; the insulated wire covering the surface of the signal wire is wrapped on the surface of the signal wire 4 to form a ground shielding layer covering the surface of the signal wire 4, thereby shielding the interference of external signals. Exemplarily, the insulated wire is at least one of an enameled wire or a metal wire with good insulation and flexibility. An enameled wire or a metal wire with good insulation and flexibility is wrapped around each metal signal wire 4 that needs to be shielded from external signal interference, and the enameled wire or the metal wire with good insulation or flexibility fully wraps around the signal wire to fully cover the signal wire. One enameled wire or a metal wire with good insulation or flexibility, or two or two insulated wires connected head to tail, are wrapped around one signal wire 4.

[0041] Preferably, the grounded metal foil covers the connection surface between the grounded metal foil and the insulating fixing seat 3; the more fully the grounded metal foil covers, the more fully it can shield the signal line, thereby reducing the interference from external signals, thereby improving the stability and reliability of the signal during the test process.

[0042] In one embodiment, the insulating fixing seat 3 is provided with adapter holes (not shown) corresponding to the number and size of the test target signals; each of the adapter holes is passed through a signal line 4 and the insulated wire wound around the signal line 4; each of the signal line 4 and the insulated wire wound thereon pass through one of the adapter holes to avoid contact and mutual interference between adjacent signal lines and insulated wires.

[0043] In another embodiment, the insulating fixing seat 3 includes a ceramic ring, the opening of the ceramic ring is filled with an insulating adhesive 8, and the signal line 4 and the first grounding shield 5 are fixed in the opening of the ceramic ring by the insulating adhesive 8; the signal line 4 is fixed by the insulating adhesive 8 to prevent the signal lines from contacting each other and interfering with each other. For example, refer to Figure 1 As shown, the insulating fixing seat 3 includes a first ceramic ring 31 and a second ceramic ring 32. The top of the first ceramic ring 31 is fixed to the bottom of the circuit board 1, and the second ceramic ring 32 is fixed to the bottom of the first ceramic ring 31. The central opening diameter of the first ceramic ring 31 is smaller than the central opening diameter of the second ceramic ring 32. The central openings of the first ceramic ring 31 and the second ceramic ring 32 are filled with insulating adhesive 8, and the grounding metal foil is fixed to the bottom of the first ceramic ring 31. The opening diameter of the end face of the second ceramic ring 32 away from the first ceramic ring 31 is smaller than the opening diameter of the end face of the second ceramic ring 32 adjacent to the first ceramic ring 31. The end face of the second ceramic ring 32 away from the first ceramic ring 31 is provided with a plurality of fixing holes for the probe to pass through and limit the tail of the probe. The ceramic ring is filled with insulating adhesive. After the insulating adhesive 8 is cured, it can fix each signal line and the first shielding member in the entire ring to ensure the stability of the signal connection.

[0044] In one embodiment of the lead space converter, the insulating holder 3 is detachably connected to the circuit board 1; the openings on the insulating holder 3 correspond to the number and size of the signals required for the test, and the insulating holder is detachably connected to the circuit board to facilitate replacement according to the test requirements. Exemplarily, the insulating holder 3 is fastened to the circuit board 1 by mechanical screws with a specific torque.

[0045] Preferably, a conductive member (not shown) is provided between the insulating fixing seat 3 and the probe, and the conductive member is electrically connected to the signal line 4 and the probe respectively; the insulating fixing seat 3 itself has good insulation, and the signal line 5 needs to be electrically connected to the probe of the probe card via the conductive member.

[0046] Preferably, the conductive member 4 includes a metal layer, and the metal layer is plated on the bottom surface of the insulating fixing seat. Exemplarily, the metal layer is a gold-plated layer. A layer of gold is plated on the fixing hole surface of the lower surface of the insulating fixing seat 3, and the thickness of the gold plating is set according to different test conditions. The process is used for the electrical connection of the probe.

[0047] Embodiment 2: This embodiment provides a lead space converter, which is different from the lead space converter provided in Embodiment 1 in that: in this embodiment, the first grounding shielding component 5 includes a metal tube, and the signal line is passed through the metal tube; the metal tube is put on the signal line to achieve grounding shielding to shield the interference of external signals.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A lead space transformer, characterized in that: include: A circuit board, wherein a test contact is provided on the top surface of the circuit board; An insulating fixing seat, the insulating fixing seat is fixed to the bottom surface of the circuit board; A signal line, one end of which is electrically connected to the test contact, and the other end of which is electrically connected to the probe via the insulating fixing seat; the insulating fixing seat is provided with transfer holes corresponding to the number and size of the test target signal, and each of the transfer holes is provided with one of the signal lines; A first grounding shielding member, the surface of each of the signal lines is covered with the first grounding shielding member, one end of the first grounding shielding member is connected to a test grounding point arranged on the top surface of the circuit board, and the other end is connected to the insulating fixing seat.

2. The lead space transformer according to claim 1, characterized in that: The lead space transformer further comprises: a second grounding shielding member, the second grounding shielding member comprising a grounding metal foil fixed to the bottom end of the insulating fixing seat; One end of the first grounding shielding member is connected to a test grounding point arranged on the top surface of the circuit board, and the other end is connected to the grounding metal foil.

3. The lead space transformer according to claim 2, characterized in that: The first grounding shielding component includes a metal tube, and the signal line is inserted into the metal tube.

4. The lead space transformer according to claim 2, characterized in that: The first ground shielding component includes an insulated wire, and the surface of each of the signal wires is wrapped with the insulated wire to shield the outer surface of the signal wire.

5. The lead space transformer according to any one of claims 2 to 4, characterized in that: The grounding metal foil covers the connection surface between the grounding metal foil and the insulating fixing seat.

6. The lead space transformer according to claim 1, characterized in that: The insulating fixing seat comprises a ceramic ring, an opening of which is filled with an insulating adhesive, and the signal line and the first grounding shielding member are fixed in the opening of the ceramic ring by the insulating adhesive.

7. The lead space transformer according to claim 1, characterized in that: The insulating fixing seat is detachably connected to the circuit board.

8. The lead space transformer according to claim 1, characterized in that: A conductive member is arranged between the insulating fixing seat and the probe, and the conductive member is electrically connected to the signal line and the probe respectively.

9. The lead space transformer according to claim 8, characterized in that: The conductive member comprises a metal layer, and the metal layer is plated on the bottom surface of the insulating fixing seat.

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