On-board line loss calibration auxiliary device applied to RF mass production board and on-board channel line loss measurement method of RF mass production board
By designing an onboard line loss calibration auxiliary device for RF mass production boards, and using line loss measurement instruments to measure onboard line loss, the problem of inaccurate measurement of onboard line loss value in the prior art is solved, and the accurate measurement of onboard line loss on RF mass production boards is achieved and the consistency of chip performance is achieved.
Patent Information
- Application Number
- CN202510094164.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-04-04
AI Technical Summary
In the mass production test of existing RF PA chips, it is difficult to accurately measure the onboard line loss value, resulting in too large differences in test values between different sites and inaccurate tests, which affects the consistency of chip performance.
A onboard wire loss calibration auxiliary device is designed, including a pin crimping plate, a radio frequency interface and a connecting line. The line loss of the second connecting line is measured through a line loss measuring instrument, thereby calculating the line loss of the first connecting line, and realizing the accurate measurement of the onboard wire loss on the mass production board.
The accurate measurement of the onboard line loss value of each onboard path on the RF mass production board is achieved, reducing the material difference between different sites and ensuring the consistency of chip performance.
Smart Images
Figure CN119757808A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of chip mass production testing, and more specifically, relates to an onboard line loss calibration auxiliary device applied to a radio frequency mass production board and an onboard channel line loss measurement method of the radio frequency mass production board. Background Art
[0002] At present, RF front-end chips have been widely used in various electronic devices, such as mobile phones, tablets, routers, etc., and each RF chip needs to undergo rigorous mass production testing before formal shipment to ensure that the quality and performance of the chip can meet customer requirements. Therefore, we should ensure that the performance of the tested chip is as close to the performance when used by the client as possible during mass production testing.
[0003] The mass production tests of RF front-end chips are all carried out using ATE (Automatic Test Equipment). The chip pins are brought out to the mass production board through the test fixture pins on the mass production board in contact with the chip, and the ATE is directly connected to the SMA connector corresponding to the mass production board.
[0004] In the existing mass production test of RF PA chips, usually only the cable loss value (Cable loss) between the ATE and the SMA connector of the mass production board is calibrated. The line loss value (Traceloss) between the SMA connector on the mass production board and the RF pin of the chip under test is usually compensated by empirical value estimation, or by adjusting the power value to align the working current to compensate the Traceloss to achieve a given test condition. The schematic diagram is shown in the figure. Figure 4 shown.
[0005] However, with the increasing complexity of RF front-end chips, mass production test plans also need to be changed accordingly. When an RF front-end chip has too many RF interfaces, in multi-site testing, we should reasonably allocate RF test resources according to the RF configuration of the ATE. When designing the test plan, we also need to merge the same type of RF ports on the mass production board through the onboard RF switch to save RF resources. In order to ensure that the signal power of the chip output is within a safe range when entering the onboard RF switch, some onboard attenuators are usually connected to the mass production board circuit according to the output power size. The above-mentioned RF switches and attenuators can be collectively referred to as onboard devices.
[0006] Due to the differences in onboard components and the differences in PCB routing at different sites on mass-produced boards, if compensation is still based on empirical values, it is easy to cause large differences in test values between different sites and inaccurate test values; if Traceloss is compensated by adjusting the power value to align the working current, it will be very troublesome when there are many test frequency points during mass production. When replacing different mass-produced boards, due to differences in the process of mass-produced boards and the performance of onboard components, it is easy to cause the same material to have large performance differences on two mass-produced boards.
[0007] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention
[0008] The purpose of the present invention is to propose an onboard line loss calibration auxiliary device applied to a radio frequency mass production board and an onboard channel line loss measurement method of the radio frequency mass production board, so as to accurately measure the onboard line loss value of each onboard channel on the mass production board.
[0009] To achieve the above-mentioned purpose, the present invention proposes an on-board line loss calibration auxiliary device applied to a radio frequency mass production board and an on-board channel line loss measurement method of the radio frequency mass production board.
[0010] According to a first aspect of the present invention, a board-mounted line loss calibration auxiliary device applied to a radio frequency mass production board is proposed, comprising:
[0011] A plate body, the plate body comprising:
[0012] A pin crimping plate, wherein the pin crimping plate is provided with a plurality of pin crimping interfaces, and the plurality of pin crimping interfaces correspond one-to-one to the pins of the fixture of the RF mass production board;
[0013] A plurality of first radio frequency interfaces, each of which is connected to the pin crimping interface having the same definition;
[0014] The lengths of the first connecting lines of each of the first radio frequency interfaces and the pin crimping board are the same;
[0015] a second radio frequency interface, and a third radio frequency interface connected to the second radio frequency interface, wherein the length of a second connection line between the second radio frequency interface and the third radio frequency interface is twice the length of the first connection line;
[0016] The second RF interface and the third RF interface are respectively used to connect a first test line and a second test line of a line loss measuring instrument, and the line loss of the first connection line is obtained based on the line loss measuring instrument measuring the line loss of the second connection line.
[0017] Optionally, the pin crimping interface with the same definition includes:
[0018] Classifying the pins of the fixture according to the pin definition of the product to be tested;
[0019] The pin crimping interfaces corresponding to the pins of the same category are the pin crimping interfaces with the same definition.
[0020] Optionally, the plate body further includes:
[0021] A plurality of first fixing holes, corresponding to the plurality of second fixing holes of the fixture, and the second fixing holes corresponding to the plurality of third fixing holes of the RF mass production board;
[0022] The board body is fixed to the fixture through the first fixing hole, the second fixing hole and the third fixing hole, and then fixed to the RF mass production board.
[0023] According to a second aspect of the present invention, a method for measuring the line loss of an onboard channel of an RF mass production board is provided. Based on the onboard line loss calibration auxiliary device applied to the RF mass production board according to any one of the first aspects, the method comprises:
[0024] Measuring a first test line line loss of a first test line and a second test line line loss of a second test line of a line loss measuring instrument;
[0025] Calibrate the line loss measuring instrument based on the line loss of the first test line and the line loss of the second test line so that the difference between the output power and the received power of the line loss measuring instrument is zero;
[0026] The onboard line loss calibration auxiliary device is fixed on the fixture of the RF mass production board, and then fixed on the RF mass production board;
[0027] Measuring a first line loss from the second radio frequency interface to the third radio frequency interface;
[0028] Calculate a second line loss from each first RF interface to a pin crimping plate of the onboard line loss calibration auxiliary device based on the first line loss;
[0029] Measuring a third line loss from the onboard RF interface of the RF mass production board to the corresponding first RF interface;
[0030] A fourth line loss of the onboard RF path corresponding to the onboard RF interface is calculated based on the third line loss and the second line loss.
[0031] Optionally, measuring a first test line loss of a first test line and a second test line loss of a second test line of the line loss measuring instrument comprises:
[0032] Connecting one end of the first test line to the output end of the line loss measuring instrument, connecting the other end of the first test line to a power meter, and calculating the line loss of the first test line according to the output power of the line loss measuring instrument and the displayed power of the power meter;
[0033] Connect one end of the first test line to one end of the second test line, connect the other end of the first test line to the output end of the line loss measuring instrument, and connect the other end of the second test line to the receiving end of the line loss measuring instrument;
[0034] The second test line loss is calculated according to the output power, the received power and the first test line loss of the line loss measuring instrument.
[0035] Optionally, measuring a first line loss from the second radio frequency interface to the third radio frequency interface includes:
[0036] Connect one end of the first test line to the output end of the line loss measuring instrument, connect the other end of the first test line to the second RF interface, connect one end of the second test line to the receiving end of the line loss measuring instrument, and connect the other end of the second test line to the third RF interface;
[0037] The first line loss is obtained by calculating according to the output power and the received power of the line loss measuring instrument.
[0038] Optionally, the first line loss includes losses of the second RF interface, the third RF interface and the second connecting line;
[0039] Dividing the first line loss by 2 to obtain the second line loss;
[0040] The second line loss includes the loss of the first radio frequency interface and the first connecting line.
[0041] Optionally, measuring a third line loss from an onboard RF interface of the RF mass production board to the corresponding first RF interface includes:
[0042] Connect one end of the first test line to the output end of the line loss measuring instrument, connect the other end of the first test line to the first RF interface, connect one end of the second test line to the receiving end of the line loss measuring instrument, and connect the other end of the second test line to the onboard RF interface corresponding to the first RF interface;
[0043] The third line loss is obtained by calculating according to the output power and the received power of the line loss measuring instrument.
[0044] Optionally, the fourth line loss includes:
[0045] The loss of the onboard RF interface and the corresponding onboard path.
[0046] Optionally, line loss compensation is performed on the corresponding onboard channel based on the fourth line loss and the onboard attenuator.
[0047] The beneficial effect of the present invention is that the present invention can accurately measure the onboard line loss of all onboard RF paths on each mass-produced board through the onboard line loss calibration auxiliary device applied to the RF mass-produced board. During multi-site testing, the difference in materials between different sites can be effectively reduced to ensure the consistency of material performance.
[0048] The system of the present invention has other characteristics and advantages, which will be apparent from the drawings incorporated herein and the following detailed description, or will be described in detail in the drawings incorporated herein and the following detailed description, which together serve to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0049] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, in which like reference numerals generally represent like components.
[0050] Figure 1 A schematic diagram of an on-board line loss calibration auxiliary device applied to a radio frequency mass production board according to an embodiment is shown.
[0051] Figure 2 A connection diagram of an on-board line loss calibration auxiliary device applied to a radio frequency mass production board according to an embodiment is shown.
[0052] Figure 3 A flowchart showing the steps of an on-board line loss calibration auxiliary method applied to a radio frequency mass production board according to an embodiment is shown.
[0053] Figure 4 A schematic diagram of wiring between the existing ATE and a mass production board according to the present invention is shown.
[0054] Description of reference numerals:
[0055] 1. Board body, 2. Pin crimping plate, 3. First RF interface, 4. First RF interface, 5. First RF interface, 6. Second RF interface, 7. Third RF interface, 8. First connecting line, 9. Second connecting line, 10. First fixing hole, 11. First test line, 12. Second test line, 11. On-board line loss calibration auxiliary device for RF mass production board, 12. Fixture pins, 13. Fixing bolts, 14. RF mass production board, 15. On-board RF interface, 16. Test fixture, 17. First RF interface, 18. Line loss measuring instrument, cable1, first test line, cable2, second test line. DETAILED DESCRIPTION
[0056] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.
[0057] Example 1
[0058] like Figure 1 As shown, this embodiment provides an on-board line loss calibration auxiliary device applied to a radio frequency mass production board, including:
[0059] The board body 1 includes:
[0060] A pin crimping plate 2, wherein the pin crimping plate 2 is provided with a plurality of pin crimping interfaces, and the plurality of pin crimping interfaces correspond one to one with the pins of the test fixture of the RF mass production board;
[0061] A plurality of first radio frequency interfaces, each of which is connected to a pin crimping interface with the same definition; the lengths of the first connecting lines 8 of the plurality of first radio frequency interfaces and the pin crimping board are the same;
[0062] A second RF interface 6, and a third RF interface 7 connected to the second RF interface 6, wherein the length of a second connection line 9 between the second RF interface 6 and the third RF interface 7 is twice the length of the first connection line 8;
[0063] The second RF interface 6 and the third RF interface 7 are respectively used to connect the first test line and the second test line of the line loss measuring instrument, and the line loss of the first connecting line 8 is obtained by measuring the line loss of the second connecting line 9 based on the line loss measuring instrument.
[0064] Specifically, Figure 1As shown, a pin crimping plate 2, a plurality of first RF interfaces, a second RF interface 6 and a third RF interface 7 are provided on the board body 1. In this embodiment, the plurality of first RF interfaces are respectively a first RF interface 3, a first RF interface 4 and a first RF interface 5, and the first RF interface 3, the first RF interface 4, the first RF interface 5, the second RF interface 6 and the third RF interface 7 are all the same SMA connectors. During the specific implementation process, the model and quantity of the RF interface can be designed according to the actual situation; the pin crimping plate 2 is consistent in size with the pin area of the test fixture on the RF mass production board, and the pin interface of the pin crimping plate 2 completely corresponds to the pin position of the test fixture, such as Figure 2As shown, the pin crimping plate 2 is provided with pin crimping interfaces corresponding to the pins of the test fixture 16 of the RF mass production board 14, and the first RF interface 3, the first RF interface 4 and the first RF interface 5 are respectively connected to the corresponding pin crimping interfaces with the same definition through the first connecting line 8, and the first RF interface 3, the first RF interface 4 and the first RF interface 5 are the same length as the first connecting line 8 of the pin crimping plate 2; the second RF interface 6 is connected to the third RF interface 7 through the second connecting line 9, and the second RF interface 6 is connected to the third RF interface 77 through the second connecting line 9. The length of the connection 9 is twice the length of the first connection line 8. In the specific implementation process, the length, multiple relationship and installation position of the first connection line 8 and the second connection line 9 can be adjusted according to actual conditions; by crimping the pin crimping plate 2 with the fixture pin 12 of the test fixture 16 on the RF mass production board 14, the onboard path on the RF mass production board 14 is led out to the first RF interface 3, the first RF interface 4 and the first RF interface 5, and the line loss measuring instrument 18, such as a vector network analyzer, ATE and other instruments with power signal receiving and transmitting functions, is used to measure the first The line loss between the second RF interface 6 and the third RF interface 7 can be used to calculate the line loss between the pin crimping plate 2 and the first RF interface 3, the first RF interface 4, and the first RF interface 5. The line loss value includes the line loss value of two SMA connectors and twice the line loss value of the first connecting line 8; then measure the line loss between the onboard RF interface 15 and the first RF interface 3, the first RF interface 4, and the first RF interface 5. By calculation, the onboard line loss value of the corresponding onboard path on the RF mass production board 14 can be accurately obtained, that is, the first RF interface 3, the first RF interface 4 and the first RF interface 5 and The onboard line loss value of the onboard RF path between the onboard RF interface 15 corresponding to the pins of the corresponding fixture; the onboard RF path between the onboard RF interface 15 and the corresponding first RF interface 3, first RF interface 4 or first RF interface 5 is changed by the RF switch on the RF mass production board 14, and the onboard line loss value of each onboard RF path can be obtained. Finally, the onboard line loss of the onboard RF path is compensated according to the corresponding onboard line loss value by the attenuator corresponding to each onboard RF path on the RF mass production board 14, and the onboard line loss calibration of the RF mass production board 14 is completed. This embodiment can accurately measure the onboard line loss of all onboard RF paths on each mass production board, so that the power conditions tested in the mass production test are more accurate, and there will be no performance difference when replacing the mass production board. During multi-site testing, the difference of materials between different sites can be effectively reduced to ensure the consistency of material performance.
[0065] In this embodiment, the pin crimping interface having the same definition includes:
[0066] Classify the fixture pins 12 according to the pin definition of the product to be tested;
[0067] The pin crimping interfaces corresponding to the pins of the same category are the pin crimping interfaces with the same definition.
[0068] Specifically, the pin definition of the product to be tested includes input, input output and output. For example, the input pins are combined together through the onboard RF switch and connected to the corresponding onboard RF interface 15; the fixture pins 12 are divided according to the pin definition of the product to be tested, and the pin crimping interfaces corresponding to the pins of the same category are the pin crimping interfaces with the same definition, which are respectively connected to the first RF interface 3, the first RF interface 4 and the first RF interface 5 through the onboard bus (first connecting line), so as to realize that the onboard RF path corresponding to the onboard RF interface 15 is led out to the first RF interface 3, the first RF interface 4 and the first RF interface 5. For example, the input pin of the product to be tested corresponding to the first onboard RF interface 15 is led out to the first RF interface 3 through the input pin of the fixture pin 12, the output pin of the product to be tested corresponding to the second onboard RF interface 15 is led out to the first RF interface 4 through the output pin of the fixture pin 12, and the input and output pins of the product to be tested corresponding to the third onboard RF interface 15 are led out to the first RF interface 5 through the input and output pins of the fixture pin 12.
[0069] In this embodiment, the board body 1 further includes:
[0070] Four first fixing holes 10 correspond to the four second fixing holes of the fixture, and the second fixing holes correspond to the four third fixing holes of the RF mass production board 14;
[0071] The board body 1 is fixed to the test fixture 16 through the first fixing hole 10 , the second fixing hole and the third fixing hole, and then fixed to the RF mass production board 14 .
[0072] Specifically, Figure 1 As shown, each first fixing hole 10 has a second fixing hole that matches it. This correspondence is highly consistent in space. Whether it is from the perspective of their relative positions in the plane or their overlap in the vertical direction, it can ensure the smooth progress of subsequent fixing operations. These second fixing holes of the fixture correspond to multiple third fixing holes of the RF mass production board, thus forming a layer-by-layer corresponding hole structure system. Figure 2 As shown, by passing the fixing bolts 13 through the first fixing hole 10, the second fixing hole and the third fixing hole in sequence, the board body 1 can be fixed on the test fixture 16, and finally fixed on the RF mass production board 14, so as to achieve a stable installation of the board body 1 on the RF mass production board 14.
[0073] Example 2
[0074] like Figure 3 As shown, this embodiment provides an onboard line loss calibration auxiliary method applied to a radio frequency mass production board. Based on the onboard line loss calibration auxiliary device applied to a radio frequency mass production board described in Example 1, the method includes:
[0075] S1, measuring a first test line loss of a first test line cable1 and a second test line loss of a second test line cable2 of a line loss measuring instrument 18;
[0076] In this step, one end of the first test line cable1 is connected to the output end of the line loss measuring instrument 18, and the other end of the first test line cable1 is connected to the power meter, and the first test line loss is calculated according to the output power of the line loss measuring instrument 18 and the displayed power of the power meter; one end of the first test line cable1 and one end of the second test line cable2 are connected, the other end of the first test line cable1 is connected to the output end of the line loss measuring instrument 18, and the other end of the second test line cable2 is connected to the receiving end of the line loss measuring instrument 18; the second test line loss is calculated according to the output power of the line loss measuring instrument 18, the receiving power and the first test line loss.
[0077] Specifically, the line loss of the first test line cable1 and the second test line cable2 equipped with the line loss measuring instrument 18 for measuring line loss should be measured respectively. This measurement process requires the use of professional measurement methods and related equipment, such as high-precision power meters and other instruments, under a specific test environment (such as setting stable temperature, humidity, electromagnetic interference and other conditions to meet standard requirements), by inputting a signal of known power into the test line, and then detecting the received power at the other end, the first test line loss of the first test line cable1 and the second test line loss of the second test line cable2 are determined according to the difference between the input power and the received power. In this embodiment, one end of the first test line cable1 is accurately connected to the output end of the line loss measuring instrument 18. During the connection process, it is necessary to ensure that the joint is in good contact to avoid the occurrence of a false connection that affects the measurement result. Then, the other end of the first test line cable1 is connected to the power meter. It is also necessary to ensure that the connection is firm so that the signal can be transmitted stably. After the connection is completed, the line loss measuring instrument 18 is turned on to output a known and stable power signal, which will be transmitted to the power meter through the first test line cable1. The power meter will display the received power value in real time, and the line loss of the first test line is calculated based on the output power of the line loss measuring instrument 18 and the displayed power of the power meter. Before measuring the line loss of the second test line cable2, the test line is reconnected. One end of the first test line cable1 is connected to one end of the second test line cable2. This connection can be achieved using a special RF connector or adapter. It is necessary to ensure that the connection is tight and the signal transmission is smooth. Then, connect the other end of the first test line cable1 to the output end of the line loss measuring instrument 18, so that the signal can be output from the line loss measuring instrument and transmitted through the first test line. Next, connect the other end of the second test line cable2 to the receiving end of the line loss measuring instrument 18 to build a complete signal transmission loop, so that the signal starts from the output end of the instrument, passes through the first test line cable1, the connecting part, and then passes through the second test line cable2, and finally returns to the receiving end of the line loss measuring instrument 18; the line loss of the second test line is calculated according to the output power, receiving power and line loss of the first test line of the line loss measuring instrument 18, that is, the line loss of the second test line = output power-receiving power-first test line loss. In the implementation process, in order to improve the accuracy of the measurement results, the above measurement process can be repeated many times, and the corresponding output power and receiving power values are recorded each time, and the average value of the measurement results is taken as the final measurement result, so as to reduce the influence of random errors that may exist in the measurement process on the results.
[0078] S2, calibrating the line loss measuring instrument 18 based on the line loss of the first test line and the line loss of the second test line, so that the difference between the output power and the received power of the line loss measuring instrument 18 is zero;
[0079] Specifically, the goal of calibration is to make the difference between the output power and the received power of the line loss measuring instrument 18 zero, that is, to put the line loss measuring instrument 18 in an ideal, accurate measurement state without the introduction of additional errors. During the calibration process, the measurement deviation of the line loss measuring instrument 18 itself is corrected by adjusting the relevant parameters inside the line loss measuring instrument 18 (such as the parameter settings of the gain adjustment module, compensation circuit, etc.) according to the specific value of the test line loss, so that the subsequent use of the line loss measuring instrument 18 for other line loss measurements can be more accurate and reliable. The line loss of the first test line and the second test line loss obtained in step S1 are used as line loss calibration values to compensate the line loss measuring instrument 18. At this time, the first test line Cable1 and the second test line Cable2 are directly connected and connected to the line loss measuring instrument 18, and the difference between the output power and the received power of the line loss measuring instrument 18 should be 0; wherein, if the line loss measuring instrument 18 is a vector network analyzer, the vector network analyzer can be directly self-calibrated so that the power error between the instrument output power reaching the end of the first test line Cable1 and the input power reaching the beginning of the second test line Cable2 is 0, that is, if the first test line Cable1 and the second test line Cable2 are directly connected after self-calibration, the power difference between the two should be 0, and the line loss calibration of the first test line Cable1 and the second test line Cable2 is completed. By accurately measuring the line loss of the first test line Cable1 and the second test line Cable2, and calibrating the line loss measuring instrument 18 based on this, the difference between the output power and the received power of the line loss measuring instrument 18 itself is made close to zero. This can effectively eliminate the deviation in the measurement result caused by the line loss in the test line itself, so that in the subsequent line loss measurement of each RF path of the RF mass production board 14 and the first connecting line 8 and the second connecting line 9 of the on-board line loss calibration auxiliary device 11 applied to the RF mass production board, more accurate line loss values can be obtained.
[0080] S3, fixing the onboard line loss calibration auxiliary device 11 applied to the RF mass production board on the test fixture 16 of the RF mass production board 14, and then fixing it on the RF mass production board 14;
[0081] Specifically, Figure 2 As shown, the RF mass production board 14, the test fixture 16, and the on-board line loss calibration auxiliary device 11 applied to the RF mass production board are positioned and fixed by fixing the stud 13 through the first fixing hole 10 of the on-board line loss calibration auxiliary device 11 applied to the RF mass production board, the second fixing hole of the test fixture 16, and the third fixing hole of the RF mass production board 14, respectively, to provide a stable basic condition for subsequent line loss measurement.
[0082] S4, measuring the first line loss from the second RF interface 6 to the third RF interface 7;
[0083] In this step, one end of the first test line Cable1 is connected to the output end of the line loss measuring instrument 18, the other end of the first test line Cable1 is connected to the second RF interface 6, one end of the second test line Cable2 is connected to the receiving end of the line loss measuring instrument 18, and the other end of the second test line Cable2 is connected to the third RF interface 7; the first line loss is calculated based on the output power and receiving power of the line loss measuring instrument 18.
[0084] Specifically, the first test line Cable1 is connected to the output power end of the line loss measuring instrument 18 and the second RF interface 6, the second test line Cable2 is connected to the receiving power end of the line loss measuring instrument 18 and the third RF interface 7, the output power of the line loss measuring instrument 18 is set, and the receiving power of the line loss measuring instrument 18 is read. The first line loss is the output power minus the receiving power. In order to improve the accuracy of the measurement results, the above measurement process can be repeated multiple times, and the corresponding output power and receiving power values are recorded each time, and then the first line loss is calculated each time, and finally the average value of these line losses is taken as the final first line loss measurement result, so as to reduce the influence of random errors that may exist in the measurement process on the results.
[0085] S5, calculating the second line loss from the first RF interface 3, the first RF interface 4 and the first RF interface 5 to the pin crimping plate of the onboard line loss calibration auxiliary device based on the first line loss;
[0086] In this step, the first line loss includes the loss of the second RF interface 6, the third RF interface 7 and the second connecting line 9; the first line loss is divided by 2 to obtain the second line loss; the second line loss includes the loss of the first RF interface 3, the first RF interface or the first RF interface 5 and the first connecting line 8.
[0087] Specifically, the lengths of the first connecting wires 8 from the first RF interface 3, the first RF interface 4 and the first RF interface 5 to the pin crimping plate of the onboard line loss calibration auxiliary device are all the same, and the first RF interface 3, the first RF interface 4 and the first RF interface 5 are all the same SMA connectors, so the line losses of the first RF interface 3, the first RF interface 4 and the first RF interface 5 to the pin crimping plate of the onboard line loss calibration auxiliary device are all the same, which are all second line losses; the first line loss includes the loss of the second RF interface 6, the third RF interface 7 and the second connecting wire. Since the length of the second connecting wire 9 between the second RF interface 6 and the third RF interface 7 is twice the length of the first connecting wire 8, and the second line loss includes the loss of the first RF interface 3, the first RF interface 4 or the first RF interface 5 and the first connecting wire 8, that is, the first line loss includes the loss of 2 SMA connectors and 2 first connecting wires 8, and the second line loss includes the loss of 1 SMA connector and 1 first connecting wire 8, therefore, the first line loss is twice the second line loss, and the second line loss can be obtained by measuring the first line loss.
[0088] S6, measuring the third line loss from the onboard RF interface 15 of the RF mass production board 14 to the corresponding first RF interface 3, first RF interface 4 and first RF interface 5;
[0089] like Figure 2 As shown, in this step, one end of the first test line cable1 is connected to the output end of the line loss measuring instrument 18, and the other end of the first test line cable1 is connected to the first RF interface 17 (ie Figure 1 The first RF interface 3, the first RF interface 4 or the first RF interface 5 in the circuit is connected, one end of the second test line cable 1 is connected to the receiving end of the line loss measuring instrument 18, and the other end of the second test line cable 2 is connected to the onboard RF interface 15 corresponding to the first RF interface 17; the third line loss is calculated according to the output power and the receiving power of the line loss measuring instrument 18, and the third line loss = output power - receiving power. S7, calculate the fourth line loss of the onboard RF path corresponding to the onboard RF interface 15 based on the third line loss and the second line loss.
[0090] In this step, the fourth line loss includes: the loss of the onboard RF interface 15 and the corresponding onboard path.
[0091] Specifically, the fourth line loss = the third line loss - the second line loss, such as Figure 2 As shown, the onboard RF interface 15 and the corresponding first RF interface 17 (i.e. Figure 1 The onboard RF path between the first RF interface 3, the first RF interface 4 or the first RF interface 5) can be obtained by the same steps as above, and the onboard line loss value of each onboard RF path, that is, the fourth line loss.
[0092] In this embodiment, line loss compensation is performed on the corresponding onboard path based on the fourth line loss and the onboard attenuator.
[0093] Specifically, according to the fourth line loss obtained, the relevant parameters of the onboard attenuator are reasonably set. For example, if the fourth line loss reduces the signal strength by a certain decibel value, the onboard attenuator can be adjusted to make the signal gain the opposite and the same decibel value (that is, reduce the attenuation of the signal), thereby achieving line loss compensation for the onboard path. The specific adjustment method may vary depending on the type of onboard attenuator. Some are achieved by changing hardware parameters such as resistance values, while others can use software control to adjust their attenuation characteristics.
[0094] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.
Claims
1. A board-mounted line loss calibration auxiliary device applied to a radio frequency mass production board, characterized in that: include: A plate body, the plate body comprising: A pin crimping plate, wherein the pin crimping plate is provided with a plurality of pin crimping interfaces, and the plurality of pin crimping interfaces correspond one-to-one to the pins of the fixture of the RF mass production board; A plurality of first radio frequency interfaces, each of which is connected to the pin crimping interface having the same definition; The lengths of the first connecting lines of each of the first radio frequency interfaces and the pin crimping board are the same; a second radio frequency interface, and a third radio frequency interface connected to the second radio frequency interface, wherein the length of a second connection line between the second radio frequency interface and the third radio frequency interface is twice the length of the first connection line; The second RF interface and the third RF interface are respectively used to connect a first test line and a second test line of a line loss measuring instrument, and the line loss of the first connection line is obtained based on the line loss measuring instrument measuring the line loss of the second connection line.
2. The on-board line loss calibration auxiliary device applied to the RF mass production board according to claim 1 is characterized in that: The pin crimping interface with the same definition includes: Classifying the pins of the fixture according to the pin definition of the product to be tested; The pin crimping interfaces corresponding to the pins of the same category are the pin crimping interfaces with the same definition.
3. The on-board line loss calibration auxiliary device applied to the RF mass production board according to claim 1 is characterized in that: The plate body also includes: A plurality of first fixing holes, corresponding to the plurality of second fixing holes of the fixture, and the second fixing holes corresponding to the plurality of third fixing holes of the RF mass production board; The board body is fixed to the fixture through the first fixing hole, the second fixing hole and the third fixing hole, and then fixed to the RF mass production board.
4. A method for measuring the onboard line loss of a radio frequency mass production board, based on the onboard line loss calibration auxiliary device applied to the radio frequency mass production board according to any one of claims 1 to 3, characterized in that: The method comprises: Measuring a first test line line loss of a first test line and a second test line line loss of a second test line of a line loss measuring instrument; Calibrate the line loss measuring instrument based on the line loss of the first test line and the line loss of the second test line so that the difference between the output power and the received power of the line loss measuring instrument is zero; The onboard line loss calibration auxiliary device is fixed on the fixture of the RF mass production board, and then fixed on the RF mass production board; Measuring a first line loss from the second radio frequency interface to the third radio frequency interface; Calculate a second line loss from each first RF interface to a pin crimping plate of the onboard line loss calibration auxiliary device based on the first line loss; Measuring a third line loss from the onboard RF interface of the RF mass production board to the corresponding first RF interface; A fourth line loss of the onboard RF path corresponding to the onboard RF interface is calculated based on the third line loss and the second line loss.
5. The method for measuring the onboard path loss of a radio frequency mass production board according to claim 4, characterized in that: The first test line loss of the first test line and the second test line loss of the second test line of the line loss measuring instrument include: Connecting one end of the first test line to the output end of the line loss measuring instrument, connecting the other end of the first test line to a power meter, and calculating the line loss of the first test line according to the output power of the line loss measuring instrument and the displayed power of the power meter; Connect one end of the first test line to one end of the second test line, connect the other end of the first test line to the output end of the line loss measuring instrument, and connect the other end of the second test line to the receiving end of the line loss measuring instrument; The second test line loss is calculated according to the output power, the received power and the first test line loss of the line loss measuring instrument.
6. The method for measuring the onboard path loss of a radio frequency mass production board according to claim 5, characterized in that: The measuring of the first line loss from the second radio frequency interface to the third radio frequency interface comprises: Connect one end of the first test line to the output end of the line loss measuring instrument, connect the other end of the first test line to the second RF interface, connect one end of the second test line to the receiving end of the line loss measuring instrument, and connect the other end of the second test line to the third RF interface; The first line loss is obtained by calculating according to the output power and the received power of the line loss measuring instrument.
7. The method for measuring the onboard path loss of a radio frequency mass production board according to claim 6, characterized in that: The first line loss includes the loss of the second RF interface, the third RF interface and the second connecting line; Dividing the first line loss by 2 to obtain the second line loss; The second line loss includes the loss of the first radio frequency interface and the first connecting line.
8. The method for measuring the onboard path loss of a radio frequency mass production board according to claim 7, characterized in that: The measuring of the third line loss from the onboard RF interface of the RF mass production board to the corresponding first RF interface includes: Connect one end of the first test line to the output end of the line loss measuring instrument, connect the other end of the first test line to the first RF interface, connect one end of the second test line to the receiving end of the line loss measuring instrument, and connect the other end of the second test line to the onboard RF interface corresponding to the first RF interface; The third line loss is obtained by calculating according to the output power and the received power of the line loss measuring instrument.
9. The method for measuring the onboard path loss of a radio frequency mass production board according to claim 8, characterized in that: The fourth line loss includes: The loss of the onboard RF interface and the corresponding onboard path.
10. The method for measuring the onboard path loss of a radio frequency mass production board according to claim 4, characterized in that: Based on the fourth line loss, the line loss of the corresponding onboard channel is compensated through the onboard attenuator.