Differential probe with bandwidth of 67G and adjustable spacing

Abstract

The utility model discloses a differential probe with a bandwidth of 67G and an adjustable interval, and belongs to the technical field of high-frequency microwave integrated circuit testing. The device comprises a bottom support, a cover plate, two probe seats and a probe, one of the two probe seats is slidably mounted between the bottom support and the cover plate, a magnetic ring, an adapter, a first wire clamping piece, a second wire clamping piece, a semi-steel cable and the probe are mounted on the probe seats, the magnetic ring is mounted in a magnetic ring cavity of the probe seats, the adapter is mounted in a cavity of the magnetic ring, and the first wire clamping piece and the second wire clamping piece are mounted in the cavity of the magnetic ring. The first wire clamping piece and the second wire clamping piece are installed in the adapter to fix the semi-steel cable, and the end portion of the semi-steel cable is provided with the probe. According to the utility model, the distance between the differential probes can be adjusted, and only the single-end probe on one side is designed to move in parallel, so that the size and the mass of the adjustable differential probes are greatly reduced. During testing, the screw rod can be flexibly adjusted according to requirements, the distance between SS signals is adjusted to the required distance, and then testing can be carried out without replacing the probe for multiple times to test PADs with different intervals.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-frequency microwave integrated circuit testing, and in particular relates to a 67G bandwidth, spacing-adjustable differential probe. Background Art

[0002] At present, with the increasing integration of PCB, the spacing of PCB test point pads is also different. Usually, there are probes with multiple pad spacings on the same PCB. When using conventional probes for testing, multiple probes with different spacings are required to meet all tests. During operation, probes with different spacings need to be frequently replaced, which is cumbersome. Therefore, a differential probe with adjustable spacing of GSSG signals has emerged. By adjusting the GS needle on one side by the control knob for translation, the distance between the two SS signals can be adjusted as needed, so that a probe can test the entire PCB by adjusting the spacing, and simplifying the test process.

[0003] Existing conventional probes all have a retractable center needle to connect to the PCB. In this case, there is a problem. The different extension amounts of the probe center needle will also lead to differences in impedance at the docking position. This difference will cause uncontrollable reflections, thereby affecting the accuracy of the test results.

[0004] During the use of conventional probes, the deflection angle between the probe and the PCB in the vertical direction cannot be too large. If it is too large, it will easily cause the center needle to break. If the probe is completely perpendicular to the PCB, it will be difficult to position it under the microscope of the probe station. Because the probe connection cable is thick, it will directly block the imaging of the probe center needle under the microscope, affecting the docking of the center needle and the PCB pad.

[0005] To this end, a 67G bandwidth and adjustable spacing differential probe is proposed to solve the problems of low test result accuracy caused by the retractable design of existing conventional probes and the inclination angle between the conventional probe and the PCB in the vertical direction cannot be too large. Utility Model Content

[0006] The purpose of the utility model is to provide a 67G bandwidth adjustable spacing differential probe, which aims to solve the problems that the existing conventional probes in the background technology adopt a retractable design, resulting in low accuracy of test results, and the angle between the conventional probe and the PCB in the vertical direction cannot be too large. To achieve the above purpose, the technical solution adopted by the utility model is: a 67G bandwidth adjustable spacing differential probe, including a base, a cover plate, a probe seat and a probe, the probe seat has two pieces and is slidably installed between the base and the cover plate, a magnetic ring, an adapter, a first clamping piece, a second clamping piece, a semi-steel cable and a probe are installed on the probe seat, the magnetic ring is installed in the magnetic ring cavity of the probe seat, the adapter is installed in the cavity of the magnetic ring, the first clamping piece and the second clamping piece are installed in the adapter to fix the semi-steel cable, and the probe is installed at the end of the semi-steel cable. The technical solution realizes the adjustable spacing of the differential probe, and at the same time, only one side of the single-ended probe is designed to move in parallel, which greatly reduces the volume and mass of the adjustable differential probe. During the test, you can flexibly adjust the screw as needed, adjust the distance between SS signals to the required distance, and then test it. There is no need to change the probe multiple times to test PADs with different spacings. One needle can do it.

[0007] Further description of the above scheme, the semi-steel cable has a conductor inside and a shielding layer outside; the first clamping piece includes a shoulder and a tin hole, and solder paste is added through the tin hole to weld the semi-steel cable shielding layer and the first clamping piece together. The probe includes an RF pin and a ground pin.

[0008] Furthermore, the base includes a positioning rod, a tungsten steel rod through hole and a glue flow hole, and there are two positioning rods installed in parallel, and the probe seat is provided with a positioning groove corresponding to the positioning rod.

[0009] More preferably, a screw assembly is installed on the side of the base, and the screw assembly includes a screw, a sleeve, and a knob. The screw is driven by rotating the knob to adjust the probe seat.

[0010] More preferably, the two probe seats are mounted on the base through a tungsten steel rod, and a spring is provided between the two probe seats. One probe seat is fixedly mounted on the base, and the other probe seat is driven to move on the base through a screw assembly.

[0011] Preferably, the end of the semi-steel cable is tilted 20 degrees. The cable is tilted 20 degrees for grinding, and it is ground to the center of the end of the conductor in the semi-steel cable. Then, the grinding surface is coated with solder paste using a special steel mesh, and the solder paste is spread all over the grinding surface. Then, the matching probe tip is adjusted to match the grinding surface through a special fixture, and the solder paste position is heated to 250 degrees for 3 seconds. After cooling, the assembly of the needle tip and the semi-steel cable is completed, forming a GS signal type. Then, the exposed position of the semi-steel cable is wrapped with absorbing material to prevent signal leakage and eliminate external interference, making the performance of the probe more stable.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The elastic needle tip used in this application can be used at an inclination angle of 45° or even higher, and can be better positioned when installed on the probe holder. The GS on one side of the adjustable-spacing differential probe of the utility model is fixed, and only one side of the GS is used for translation adjustment, which has a more stable structure, is very smooth during adjustment, and has a smaller error. At the same time, only one side can be adjusted, which can reduce the use of parts and the time required for production, thereby improving efficiency.

[0014] 2. Do not use the tip of the telescopic center needle. Directly use the elastic needle tip to solder to the center conductor of the semi-steel cable through solder paste. Solder the ground pin on the horizontal side of the shielding shell of the semi-steel cable to provide a return path for the signal. And design the impedance of the needle tip position within 100±1ohm through simulation. This structure can effectively avoid high impedance caused by improper assembly during the telescopic needle test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 An overall schematic diagram provided for an embodiment of the utility model;

[0016] Figure 2 An explosion diagram provided for an embodiment of the utility model;

[0017] Figure 3 A schematic diagram of the installation structure provided for an embodiment of the utility model;

[0018] Figure 4 A schematic diagram of the probe seat installation structure provided by an embodiment of the utility model;

[0019] Figure 5 A cross-sectional view of the installation of the adapter provided in the embodiment of the utility model;

[0020] Figure 6 A schematic diagram of the installation of a first wire clamp and a semi-steel cable provided in an embodiment of the utility model;

[0021] Figure 7 A schematic diagram of the structure of a first wire clamping member provided in an embodiment of the utility model;

[0022] Figure 8 A schematic diagram of the probe structure provided by an embodiment of the utility model;

[0023] Fig. 9 A schematic diagram of a magnetic ring structure provided in an embodiment of the utility model.

[0024] Among them, the reference numerals in the figure are:

[0025] 1. First clamping piece; 11. Shoulder; 12. Tin hole; 2. Semi-steel cable; 21. Conductor; 22. Shielding layer; 3. Adapter; 4. Second clamping piece; 5. Probe; 51. RF pin; 52. Ground pin; 6. Magnetic ring; 61. Cable through hole; 62. Cavity; 7. Probe seat; 71. Positioning groove; 8. Screw assembly; 81. Screw; 82. Sleeve; 83. Knob; 9. Bottom support; 91. Positioning rod; 92. Tungsten steel rod through hole; 93. Sleeve through hole; 94. Glue flow hole; 95. Spring; 96. Tungsten steel rod; 10. Cover plate. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0027] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0028] See also Figure 1-9 As shown, a 67G bandwidth and adjustable spacing differential probe comprises a base 9, a cover 10, a probe seat 7 and a probe 5. The probe seat 7 has two pieces and is slidably installed between the base 9 and the cover 10. A magnetic ring 6, an adapter 3, a first clamping piece 1, a second clamping piece 4, a semi-steel cable 2 and a probe 5 are installed on the probe seat 7. The magnetic ring 6 is installed in the magnetic ring cavity of the probe seat 7. The adapter 3 is installed in the cavity 62 of the magnetic ring 6. The first clamping piece 1 and the second clamping piece 4 are installed in the adapter 3 to fix the semi-steel cable 2. The probe 5 is installed at the end of the semi-steel cable 2. Figure 5 , 6 As shown, the semi-steel cable 2 has a conductor 21 inside and a shielding layer 22 outside; the first clamping piece 1 includes a shoulder 11 and a tin hole 12, and solder paste is added through the tin hole 12 to weld the shielding layer 22 of the semi-steel cable 2 and the first clamping piece 1 into one. Figure 8 As shown, the probe 5 includes an RF pin 51 and a ground pin 52 .

[0029] like Figure 2 As shown, the base 9 includes a positioning rod 91, a tungsten steel rod through hole 92 and a glue flow hole 94, and there are two positioning rods 91 installed in parallel, and the probe seat 7 is provided with a positioning groove 71 corresponding to the positioning rod 91. Figure 3As shown, a screw assembly 8 is installed in the sleeve through hole 93 on the side of the base 9. The screw assembly 8 includes a screw 81, a sleeve 82, and a knob 83. The screw 81 is driven by rotating the knob 83 to adjust the probe seat 7. Two probe seats 7 are installed on the base 9 through a tungsten steel rod 96, and a spring 95 is provided between the two probe seats 7. One probe seat 7 is fixedly installed on the base 9, and the other probe seat 7 is driven to move on the base 9 by the screw assembly 8. The end of the semi-steel cable 2 is tilted 20 degrees. The cable is tilted 20 degrees for grinding to the center of the end of the inner conductor 21 of the semi-steel cable 2, and then solder paste is applied to the polished surface with a special steel mesh to cover the entire polished surface. The matching probe tip is then adjusted to match the polished surface using a special fixture, and the solder paste position is heated to 250 degrees for 3 seconds. After cooling, the assembly of the tip and the semi-steel cable 2 is completed to form a GS signal type. The exposed position of the semi-steel cable is then wrapped with absorbing material to prevent signal leakage and eliminate external interference, making the performance of the probe more stable.

[0030] In order to have a more thorough and comprehensive understanding of the disclosed content of the utility model, the principle thereof is further explained below in combination with the usage method.

[0031] like Figure 5 , 6 As shown in Figure 7, the stripped semi-steel cable 2 is inserted into the first clamping piece 1, so that the shielding layer 22 is flush with the surface of the shoulder 11 of the first clamping piece 1 to ensure that the impedance at this location is not mismatched. After being flush, solder paste is added from the solder hole 12, and the shielding layer 22 of the semi-steel cable 2 is heated and melted to weld the first clamping piece 1 to form a whole. Then the semi-steel cable 2 and the first clamping piece 1 are installed on the adapter 3, and then fixed by the second clamping piece 4.

[0032] The metal sheet between the RF needle 51 and the ground needle 52 is used to adjust the impedance so that the impedance at this position is controlled at 50ohm. The specific implementation method is: a special assembly fixture is required. First, put the processed semi-steel cable 2 into the fixture, and then put in the ground needle 52 on one side. The frequency requirement of this probe 5 is as high as 67GHz, so the processing technology is relatively high. The processing tolerance of the assembly fixture needs to be controlled within the range of ±0.02mm. After all the above parts are placed in the assembly fixture, weld at the welding position of the ground needle 52 and the semi-steel cable 2. After cooling, the height difference between the signal needle and the ground needle 52 contacting the PCB position needs to be measured. Confirm that the height difference is controlled within the required range before use.

[0033] Will Figure 5 The components are installed on the magnetic ring 6, the semi-steel cable 2 passes through the cable through hole 61 of the magnetic ring 6, and then the absorbing rubber is filled in the gap to make the magnetic ring 6 and the adapter 3 form a whole, and then the whole is placed on the probe seat 7, as shown Figure 4Fill the cavity 62 of the magnetic ring 6 and the adapter 3 with absorbing rubber, and finally form a single-ended probe 5 for GS signal, and repeat the above operation to make a single-ended probe 5 for SG signal symmetrical thereto.

[0034] like Figure 2 , 3 As shown, the sleeve 82 is installed from the inside of the base 9 to the outside. After installation, the sleeve 82 and the base 9 will be tightly combined. When the knob 83 is placed, the sleeve 82 rotates, and metal glue is applied to the glue flow hole 94 to fix the probe seat 7 on this side. Then, the probe seats 7 of the two GS / GS probe 5 bodies are symmetrically placed, and springs 95 are installed between the probe seats 7. Then, tungsten steel rods 96 and cover plates 10 are installed, and the base 9 and cover plates 10 are installed with screws. The assembly is as shown in FIG. Figure 1 When the knob 83 is rotated and adjusted, the SS signal spacing of the two single-ended probes can be adjusted, and the absorbing sleeve is installed at the position of the absorbing sleeve of the semi-steel cable. During the test, the spacing of the probes SS is adjusted to the required position for the test, that is, a differential probe with adjustable spacing is obtained.

[0035] After the utility model is assembled, the two S signal needles are at an angle of 60 degrees, and the impedance matching between the GS signals is 50±1ohm. When the spacing between the two SS signal needles changes, the distance between the two SS signal needles has little effect on the impedance. Therefore, during testing, the differential impedance of 100ohm will not change with the change of the distance between the SS, and the test stability is high.

[0036] The adjustable spacing differential probe 5 described in the utility model adopts the GSSG signal form. During use, the user can adjust the knob 83 on the screw rod 81 according to the spacing of the pads to be tested. Through the probe station positioning test, a pair of adjustable spacing differential probes can be used to test the impedance, S parameters and other data that need to be tested of all differential signals with different spacings on the object to be tested.

[0037] In summary, the utility model directly uses the conductor 21 in the semi-steel cable to weld the beryllium copper center needle as the S signal probe point of the probe, which has a simpler structure, and the test angle during the test can be controlled at will, and the needle will not break or bend under a certain force. At the same time, when installed on the probe station, the imaging of the probe and PAD under the microscope will not be affected by the outer shell, and precise positioning can be achieved. After assembly, the conductor and the grounding needle on one side are installed in parallel. After contacting the PCB, the two needles change synchronously, and the probe position impedance will not be affected. And after being assembled into a differential probe, the four GSSG needles also change synchronously and in parallel, and the impedance is stable. The exposed position of the semi-steel cable is wrapped with absorbing material, which improves the signal performance while preventing the oxidation of the outer surface of the semi-steel cable.

[0038] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a centered element at the same time. On the contrary, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method. The terms "upper end", "lower end", "left side", "right side", "front end", "rear end" and similar expressions used herein are positional relationships with reference to the accompanying drawings.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0040] The above implementation modes are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and deformations without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The scope of patent protection of the present invention should be limited by the claims.

Claims

1. A 67G bandwidth and adjustable spacing differential probe, comprising a base (9), a cover plate (10), a probe seat (7) and a probe (5), characterized in that: The probe seat (7) has two pieces and is installed between a base (9) and a cover plate (10). A magnetic ring (6), an adapter (3), a first wire clamping member (1), a second wire clamping member (4), a semi-steel cable (2) and a probe (5) are installed on the probe seat (7). The magnetic ring (6) is installed in the magnetic ring cavity of the probe seat (7), the adapter (3) is installed in the cavity (62) of the magnetic ring (6), the first wire clamping member (1) and the second wire clamping member (4) are installed in the adapter (3) to fix the semi-steel cable (2), and the probe (5) is installed at the end of the semi-steel cable (2).

2. According to claim 1, a 67G bandwidth adjustable spacing differential probe, characterized in that: The semi-steel cable (2) has a conductor (21) inside and a shielding layer (22) on the outside; the first wire clamping component (1) comprises a shaft shoulder (11) and a tin hole (12); tin paste is added through the tin hole (12) to weld the shielding layer (22) of the semi-steel cable (2) and the first wire clamping component (1) into one body.

3. The 67G bandwidth and adjustable spacing differential probe according to claim 1, characterized in that: The probe (5) comprises an RF needle (51) and a ground needle (52).

4. The 67G bandwidth and adjustable spacing differential probe according to claim 1, characterized in that: The base (9) comprises a positioning rod (91), a tungsten steel rod through hole (92) and a glue flow hole (94), and there are two positioning rods (91) installed in parallel, and the probe seat (7) is provided with a positioning groove (71) corresponding to the positioning rod (91).

5. The 67G bandwidth and adjustable spacing differential probe according to claim 4, characterized in that: A screw assembly (8) is installed on the side of the base (9), and the screw assembly (8) comprises a screw (81), a sleeve (82), and a knob (83). The screw (81) is driven to adjust the probe seat (7) by rotating the knob (83).

6. The 67G bandwidth and adjustable spacing differential probe according to claim 5, characterized in that: Two probe seats (7) are mounted on a base (9) via a tungsten steel rod (96), and a spring (95) is provided between the two probe seats (7). One probe seat (7) is fixedly mounted on the base (9), and the other probe seat (7) is driven by a screw assembly (8) and moves on the base (9).

7. The 67G bandwidth and adjustable spacing differential probe according to claim 1, characterized in that: The end of the semi-steel cable (2) is connected to the probe (5) at an angle of 20 degrees.

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