CN110784270A - BGA port radio frequency transmission performance detection device and detection method - Google Patents
BGA port radio frequency transmission performance detection device and detection method Download PDFInfo
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- CN110784270A CN110784270A CN201910964179.5A CN201910964179A CN110784270A CN 110784270 A CN110784270 A CN 110784270A CN 201910964179 A CN201910964179 A CN 201910964179A CN 110784270 A CN110784270 A CN 110784270A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
Abstract
The invention relates to the field of radio frequency circuits, and discloses a BGA port radio frequency transmission performance detection device and a detection method. The radio frequency connector is provided with an interface used for being connected with a radio frequency tester, the radio frequency connector is connected with one surface of the radio frequency substrate, BGA balls are arranged on the other surface of the radio frequency substrate, and the array arrangement form of the BGA balls corresponds to the radio frequency port array of the BGA bonding pad of the composite substrate; the BGA balls are connected with corresponding radio frequency ports on the composite substrate through radio frequency elastic interconnection structures to achieve radio frequency interconnection. The invention realizes the pre-detection of the radio frequency transmission performance of the composite substrate bare board provided with the BGA package radio frequency product, and completes the radio frequency performance screening work of the bare board before assembly; and the frequency test range is extended to more than 4 times of the prior art. The invention can realize automatic positioning, testing and screening functions by integrating with a proper automatic machine, thereby greatly improving the detection and screening efficiency.
Description
Technical Field
The invention relates to the field of radio frequency circuits, in particular to a BGA port radio frequency transmission performance detection device and a detection method.
Background
With the realization of a miniaturized BGA (ball grid array) packaged radio frequency device, the realization form of a radio frequency component is gradually converted into the form of a radio frequency substrate and the BGA packaged radio frequency device from the traditional hybrid integration, as the BGA bonding pad is positioned at the bottom of the device, the detection cannot be carried out after the assembly is finished, the performance of the BGA radio frequency port cannot be similar to that of a digital port and the like, by adopting methods such as flying probe on-off test and the like, and the radio frequency performance test needs to be carried out on the BGA radio frequency port on a bare board of.
The part of a conventional BGA RF port on a bare RF substrate is shown in FIGS. 1(a) and 1 (b). In order to realize good radio frequency transmission, a plurality of circles of ground attribute pins are needed around the radio frequency attribute pin, so that equivalent coaxial radio frequency transmission is realized.
The key of the performance test of the BGA radio frequency port of the bare board of the radio frequency substrate lies in the interconnection between a BGA radio frequency port bonding pad and an SMA coaxial port of a radio frequency test instrument, and the current common interconnection method mainly comprises the following steps: (1) the probe connection in the probe platform instrument probe scheme utilizes the connection of an S signal port of a GSG (ground signal generator) type radio frequency probe and a radio frequency bonding pad to realize radio frequency interconnection, the testable frequency of the probe can reach a millimeter wave frequency band, but the test connection form is poor in radio frequency matching during interconnection due to the fact that the two port forms are different, the test accuracy of standing waves and insertion loss is poor, the probe platform is required for testing, and the test difficulty and the test cost are high. 2) The method can realize the test of the radio frequency BGA port with lower frequency, the test frequency of similar products which can be checked on the market is generally within 10GHz, the good contact between the outer ring ground attribute shell and the BGA ground attribute bonding pad is difficult to ensure in the test process, and the performance test effect on radio frequency signals with higher frequency is poor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in order to solve the problem of detecting and screening the radio frequency transmission performance of a composite substrate bare board for mounting BGA (ball grid array) packaged radio frequency products, a BGA port radio frequency transmission performance detection device and a detection method are provided.
The technical scheme adopted by the invention is as follows: a radio frequency transmission performance detection device for BGA ports comprises a radio frequency connector, a radio frequency substrate used for transition and BGA balls, wherein the radio frequency connector is provided with an interface used for being connected with a radio frequency tester, the radio frequency connector is connected with one surface of the radio frequency substrate, the other surface of the radio frequency substrate is provided with the BGA balls, and the array arrangement form of the BGA balls corresponds to the radio frequency port array of a BGA bonding pad of a composite substrate; the BGA balls are connected with corresponding radio frequency ports on the composite substrate through radio frequency elastic interconnection structures to achieve radio frequency interconnection.
Furthermore, the radio frequency elastic interconnection structure adopts an elastic thimble, an elastic membrane or a rivet button.
Further, the radio frequency port array includes a radio frequency attribute pin, and a plurality of turns of ground attribute pins around the radio frequency attribute pin.
Further, the radio frequency attribute pin and the ground attribute pin form an NxN array form, the radio frequency attribute pin is located at the center of the NxN array form, and N is a natural number greater than 1.
Furthermore, the ground attribute pins are distributed around the radio frequency attribute pins, and each circle of ground attribute pins are distributed at the vertex position of a polygon.
Furthermore, the radio frequency connector adopts a surface-mounted radio frequency connector.
Further, the radio frequency connector is connected with a radio frequency tester through a cable or a connector.
The invention also discloses a detection method of the radio frequency transmission performance detection device by utilizing the BGA port, which comprises the following steps: positioning the radio frequency port by adopting a positioning structure; obtaining the size of a positioning frame according to the positioning result, cutting out a radio frequency elastic interconnection structure with corresponding size and placing the radio frequency elastic interconnection structure in the positioning frame; placing the BGA port radio frequency transmission performance detection device on a radio frequency elastic interconnection structure to realize radio frequency interconnection between the BGA ball and a corresponding radio frequency port; the BGA port radio frequency transmission performance detection device transmits radio frequency signals of the composite substrate to a radio frequency tester for detection.
Furthermore, the positions of the BGA balls and the corresponding radio frequency ports are symmetrical about the radio frequency elastic interconnection structure during detection.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows: the technical scheme of the invention is that the radio frequency connector, the radio frequency substrate for transition and the BGA balls are arranged, the array arrangement form of the BGA balls corresponds to the radio frequency port array of the BGA bonding pad of the composite substrate, the radio frequency elastic interconnection structure is arranged in the middle during detection to realize the radio frequency interconnection of the BGA balls and the radio frequency port, the radio frequency signal of the composite substrate to be detected is transmitted to the radio frequency tester connected with the detection device, the structure realizes the pre-detection of the radio frequency transmission performance of the composite substrate bare board provided with the BGA packaging radio frequency product, the radio frequency performance screening work of the bare board before assembly is completed, and the workload of debugging and repairing the radio frequency component in the radio frequency substrate and BGA packaging radio frequency device integration mode is greatly reduced. The BGA radio frequency port transmission performance test frequency range is expanded to be more than 40GHz, and the frequency test range is expanded to be more than 4 times of that of the prior art. The invention can realize automatic positioning, testing and screening functions by integrating with a proper automatic machine, thereby greatly improving the detection and screening efficiency.
Drawings
Fig. 1(a) is a schematic diagram of a conventional BGA rf port.
Fig. 1(b) is another schematic diagram of a conventional BGA rf port.
FIG. 2 is a schematic diagram of the device and method for detecting the radio frequency transmission performance of the BGA port of the present invention.
FIG. 3 is a schematic diagram of the device for detecting the RF transmission performance of the BGA port of the present invention.
FIG. 4 is a schematic diagram of an RF BGA port array in an embodiment of the present invention.
Fig. 5 is an example of a composite substrate mounted with a BGA packaged rf product in an embodiment of the present invention.
FIG. 6 is a diagram of the test results of an actual test in an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to a detection device and a method for detecting and screening the radio frequency transmission performance of a composite substrate bare board provided with BGA (ball grid array) packaged radio frequency products, which take a substrate shown in figure 5 as an example, wherein various BGA packaged radio frequency products are designed on the substrate, radio frequency signals are connected with BGA balls in a detection device of a corresponding product through BGA radio frequency ports, all connections on the substrate are subjected to flying-pin on-off test by a manufacturer, but the performance of the radio frequency ports cannot be judged to be good or bad through the on-off test, and the performance of S parameters of radio frequency transmission needs to be tested.
As shown in fig. 3, the device for detecting the radio frequency transmission performance of the BGA radio frequency port (i.e., the radio frequency port of the BGA pad of the composite substrate) is a small-sized radio frequency substrate, the bottom of which is provided with a radio frequency BGA pad array for ball mounting, and the top of which is provided with a surface-mounted radio frequency connector, and the radio frequency surface-mounted connector is connected with a radio frequency performance testing instrument through a cable or an adapter. The BGA ball array structure can be connected with radio frequency test instruments such as a lost network through a radio frequency cable or a connector, the BGA ball at the bottom is connected with a corresponding BGA radio frequency port on the composite substrate through a radio frequency elastic interconnection structure as shown in figure 2, and the array arrangement form of the BGA ball corresponds to the radio frequency port array of the BGA bonding pad of the composite substrate. The composite substrate and the detection device are interconnected by using a radio frequency elastic interconnection structure in the figure, and the radio frequency elastic interconnection structure can be realized by using a radio frequency elastic thimble, an elastic membrane or a rivet button and the like (different testing frequencies, insertion loss introduction and the like). For the radio frequency performance detection of the transmission line in the radio frequency substrate connected with the two BGA radio frequency ports, the detection purpose can be realized by using one detection device at each of the two ends. During manual detection, a positioning device needs to be designed to ensure accurate positioning of the solder balls and the bonding pads, and during automatic detection, automatic positioning detection can be realized through a coordinate file of the substrate.
As shown in fig. 4, the BGA rf port in this embodiment takes the form of a 5x5 array with a center rf attribute pin. The present invention is not limited to the above-described NxN array format. The distribution form of the ground attribute pins around the central radio frequency attribute pin in fig. 1(b) can also be adopted. The array arrangement form of the BGA balls corresponds to the radio frequency port array of the BGA bonding pad of the composite substrate, and the BGA balls are understood as follows: when the BGA radio frequency port NxN array form is adopted, the BGA balls in the detection device also adopt an MxM arrangement form, the M is less than or equal to N, namely the BGA radio frequency port to be detected is determined within the NxN array form range of the BGA radio frequency port, the BGA radio frequency port to be detected is provided with the BGA balls which are in one-to-one correspondence with the BGA radio frequency port to be detected, and the positions of the BGA balls and the corresponding BGA radio frequency port are symmetrical about a radio frequency elastic interconnection structure.
In one embodiment: the BGA radio frequency port array in the form of 5x5 array is adopted, the surface-mounted connector adopts the SMPM surface-mounted connector, and the scheme of the invention is utilized to manufacture the detection device, so that the radio frequency performance test of the BGA radio frequency port transmission line of the bare board of the specific radio frequency substrate is completed, and the radio frequency performance screening work of the bare board before assembly is realized.
Practical tests show that the frequency range of the radio frequency BGA port transmission performance test device reaches more than 40GHz, and bare board detection of most BGA radio frequency ports can be met. In the embodiment, manual testing is used, a corresponding positioning structure is used for realizing the positioning function of a corresponding BGA radio frequency port, the manual testing efficiency and the alignment accuracy are improved, the radio frequency elastic interconnection structure adopts an elastic membrane form, an elastic membrane with a corresponding size is cut out and placed in a positioning frame, the BGA port radio frequency transmission performance detection device is placed on the radio frequency elastic interconnection structure to realize the radio frequency interconnection of a BGA ball and the corresponding radio frequency port, and the BGA port radio frequency transmission performance detection device transmits radio frequency signals of the composite substrate to a radio frequency tester for detection. The results of the rf transmission performance test of the BGA port in the composite substrate are shown in fig. 6: the standing wave VSWR (the lower curve in figure 6) has good performance (less than or equal to 2.5, including SMA to SMPM joints), and the transmission loss IL curve (the upper curve in figure 6) is smoothly and gradually changed; the tested 50mm length rf transmission insertion loss comprises: the insertion loss of the BGA port radio frequency vertical transition structure at 50mm radio frequency transmission insertion loss +2 positions and the insertion loss of the 2-piece detection device are equal, the design estimated value is 4.5dB @40GHz, the measured value at 40GHz is 4.3dB, and the detection effect is good. The testing and screening work of the radio frequency performance of the bare board can be completed by accurately detecting the radio frequency transmission performance.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed. Those skilled in the art to which the invention pertains will appreciate that insubstantial changes or modifications can be made without departing from the spirit of the invention as defined by the appended claims.
Claims (9)
1. The radio frequency transmission performance detection device for the BGA port is characterized by comprising a radio frequency connector, a radio frequency substrate used for transition and BGA balls, wherein the radio frequency connector is provided with an interface used for being connected with a radio frequency tester, the radio frequency connector is connected with one surface of the radio frequency substrate, the other surface of the radio frequency substrate is provided with the BGA balls, and the array arrangement form of the BGA balls corresponds to the radio frequency port array of a BGA bonding pad of a composite substrate; the BGA balls are connected with corresponding radio frequency ports on the composite substrate through radio frequency elastic interconnection structures to achieve radio frequency interconnection.
2. The BGA port radio frequency transmission performance testing device of claim 1, wherein the radio frequency elastic interconnection structure employs an elastic thimble, an elastic membrane, or a rivet button.
3. The BGA port radio frequency transmission performance testing apparatus of claim 1, wherein said rf port array includes rf attribute pins and a number of turns of ground attribute pins around the rf attribute pins.
4. The BGA port radio frequency transmission performance testing apparatus of claim 3, wherein said radio frequency attribute pin and ground attribute pin form an N x N array form, said radio frequency attribute pin being at a central position of the N x N array form, said N being a natural number greater than 1.
5. The BGA port rf transmission performance testing apparatus of claim 3, wherein said ground attribute pins are distributed around the rf attribute pins, each turn of ground attribute pins being located at a vertex of a polygon.
6. The apparatus of claim 1, wherein the RF connector is a surface mount RF connector.
7. The BGA port rf transmission performance testing apparatus of claim 1, wherein said rf connector is connected to an rf tester through a cable or connector.
8. A detection method using the BGA port radio frequency transmission performance detection device is characterized by comprising the following processes: positioning the radio frequency port by adopting a positioning structure; obtaining the size of a positioning frame according to the positioning result, cutting out a radio frequency elastic interconnection structure with corresponding size and placing the radio frequency elastic interconnection structure in the positioning frame; placing the BGA port radio frequency transmission performance detection device on a radio frequency elastic interconnection structure to realize radio frequency interconnection between the BGA ball and a corresponding radio frequency port; the BGA port radio frequency transmission performance detection device transmits radio frequency signals of the composite substrate to a radio frequency tester for detection.
9. The inspection method of claim 8 using said BGA port rf transmission performance inspection apparatus, wherein BGA balls and corresponding rf port positions are symmetric about the rf elastic interconnect structure during inspection.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112230026A (en) * | 2020-11-09 | 2021-01-15 | 中国电子科技集团公司第二十九研究所 | Microwave probe for detecting local performance of microsystem |
| CN112433072A (en) * | 2020-09-28 | 2021-03-02 | 中国电子科技集团公司第二十九研究所 | Test fixture for broadband radio frequency BGA interface system-in-package product |
| CN113777360A (en) * | 2021-07-29 | 2021-12-10 | 中国电子科技集团公司第二十九研究所 | Device for detecting radio frequency performance of radio frequency connector after assembly |
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| CN113777360A (en) * | 2021-07-29 | 2021-12-10 | 中国电子科技集团公司第二十九研究所 | Device for detecting radio frequency performance of radio frequency connector after assembly |
| CN113777360B (en) * | 2021-07-29 | 2023-05-02 | 中国电子科技集团公司第二十九研究所 | Device for detecting radio frequency performance of assembled radio frequency connector |
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