CN109309749B

CN109309749B - Line loss calibration method and system

Info

Publication number: CN109309749B
Application number: CN201811249044.2A
Authority: CN
Inventors: 张磊
Original assignee: Xiamen Meitu Mobile Technology Co Ltd
Current assignee: Shenzhen Dongfanglan Communication Technology Co ltd
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2020-06-26
Anticipated expiration: 2038-10-25
Also published as: CN109309749A

Abstract

The invention discloses a line loss calibration method, which comprises the following steps: measuring a line loss value of an interface board through a test instrument, wherein the interface board at least comprises a test seat and a radio antenna connector SMA connector connected with the test seat; measuring port errors of the test instrument through the test instrument and the radio frequency line with known line loss values; and determining the line loss value between the test seat and the port of the test instrument based on the line loss value of the interface board, the line loss value of the radio frequency line and the port error of the test instrument. The scheme can accurately calibrate the path loss in the radio frequency test process so as to test the radio frequency parameters of the mobile terminal.

Description

Line loss calibration method and system

Technical Field

The invention relates to the technical field of communication, in particular to a line loss calibration method and system and a radio frequency parameter testing method and system.

Background

In the production process of the mobile phone, the radio frequency parameters of the mobile phone, such as transmitting power, frequency error, phase error, receiving sensitivity and the like, need to be tested. When the radio-frequency signal of the mobile phone is detected by the comprehensive tester, the mobile phone is required to be connected through a radio-frequency line, wherein the insertion loss of the clamp and the uncertainty of the tester are called the system loss of a path, which is called line loss for short, and can be eliminated through calibration. In order to improve the accuracy of the radio frequency parameter test of the mobile phone, the line loss between the test socket and the test instrument needs to be calibrated.

One method for calibrating the line loss in the prior art is to calibrate the line loss by using a golden machine, i.e., calibrating the loss of a radio frequency line, a test fixture, a test instrument, and the like. The golden machine adjusts each index and parameter to a fixed optimal value, and is connected with the comprehensive tester through a radio frequency line during testing, and the radio frequency line and the comprehensive tester are calibrated simultaneously according to the indexes of the golden machine. This method has certain disadvantages that the power of the gold machine may change and be easily damaged as the standing time becomes longer and the temperature changes. The second method is to regularly use a vector network analyzer to calibrate the line loss, the method has high precision but can only test the line loss of the radio frequency line with SMA interfaces at two ends, and the common interface of the clamp is a thimble, so the line loss cannot be tested. And this approach does not provide for consistent calibration of the test instrument for variations.

Therefore, a line loss calibration method is needed, which can accurately calibrate the path loss in the radio frequency test process so as to test the radio frequency parameters of the mobile terminal.

Disclosure of Invention

To this end, the present invention provides a line loss calibration method and system, and a radio frequency parameter testing method and system, which aim to solve or at least alleviate at least one of the above problems.

According to one aspect of the invention, a line loss calibration method is provided, in which a line loss value of an interface board is measured by a test instrument, wherein the interface board comprises a test socket and an SMA connector connected with the test socket. And then measuring the port error of the test instrument through the test instrument and the radio frequency line with known line loss value. And finally, determining the line loss value between the test seat and the port of the test instrument based on the line loss value of the interface board, the line loss value of the radio frequency line and the port error of the test instrument.

Optionally, in the above method, the radio frequency wire has SMA joints at both ends.

Optionally, in the above method, the test socket may include a main set test socket and a diversity test socket, and the SMA joints may include a main set SMA joint and a diversity SMA joint, and the main set SMA joint and the diversity SMA joint are respectively connected to the main set test socket and the diversity test socket through an attenuation network.

Optionally, in the above method, one end of the test instrument may be connected to the main set test socket through a buckle wire, and the other end of the test instrument may be connected to the main set SMA connector through a radio frequency wire, so as to measure a main set line loss value of the two-port network. And then calculating the main line loss value of the interface board based on the main line loss value of the two-port network, the line loss value of the deduction line and the line loss value of the radio frequency line. Similarly, one end of the test instrument can be connected with the diversity test seat through a buckle wire, and the other end of the test instrument is connected with the diversity SMA connector through a radio frequency wire, so that the diversity line loss value of the two-port network can be measured. And then, calculating the diversity line loss value of the interface board based on the diversity line loss value of the two-port network, the line loss value of the connecting line and the line loss value of the radio frequency line.

Optionally, in the above method, the test instrument may include a main set transmit port, a diversity transmit port, and a receive port. The main set transmitting port and the receiving port can be connected through a radio frequency line, so that the main set transmitting port transmits first preset power, and first receiving power of the receiving port is measured. And the diversity transmitting port is connected with the receiving port through a radio frequency line, so that the diversity transmitting port transmits first preset power, and second receiving power of the receiving port is measured. And then calculating the error of the main set port of the test instrument based on the first preset power, the first received power and the line loss value of the radio frequency line. And calculating the diversity port error of the test instrument based on the first preset power, the second received power and the line loss value of the radio frequency line.

Optionally, in the above method, the main set SMA connector and the receiving port may be connected by a radio frequency line, the main set transmitting port is caused to transmit the second predetermined power, and the third receiving power of the receiving port is measured. And the diversity SMA connector and the receiving port are connected through a radio frequency wire, so that the diversity transmitting port transmits second preset power, and the fourth receiving power of the receiving port is measured. A main line loss value between the test socket and the port of the test instrument may then be calculated based on the third received power, the main line loss error, the line loss value of the radio frequency line, the main line loss value of the interface board, and the second predetermined power. The diversity line loss value between the test socket and the port of the test instrument may be calculated based on the fourth received power, the diversity port error, the line loss value of the radio frequency line, the diversity line loss value of the interface board, and the second predetermined power.

Optionally, in the method, the main set port error is a difference between the first received power and a line loss value of the first predetermined power and the radio frequency line. The diversity port error is the difference between the second received power and the first predetermined power and the line loss value of the radio frequency line.

Optionally, in the above method, the main line loss value between the test socket and the port of the test instrument is a difference between the third received power and the second predetermined power, the main line loss value of the interface board, the line loss value of the radio frequency line, and the error of the main line loss port. And the diversity line loss value between the test seat and the port of the test instrument is the difference between the fourth received power and the second preset power, the diversity line loss value of the interface board, the line loss value of the radio frequency line and the error of the diversity port.

Optionally, when the first predetermined power is equal to the second predetermined power and the line loss values of the radio frequency lines are the same, the main line loss value between the test socket and the port of the test instrument is a difference between the third received power and the first received power, and the main line loss value of the interface board. And the diversity line loss value between the test seat and the port of the test instrument is the difference value of the fourth receiving power, the second receiving power and the diversity line loss value of the interface board.

Optionally, in the above method, the test instrument is a vector network analyzer.

According to another aspect of the present invention, there is provided a line loss calibration system, comprising: the device comprises a test instrument, a clamp, an interface board and a radio frequency line.

The test instrument may include a main set transmit port, a diversity transmit port, and a receive port, and is adapted to transmit power through the main set transmit port and the diversity transmit port and to test receive power at the receive port. The interface board can comprise a main set testing seat and a main set SMA connector, a diversity testing seat and a diversity SMA connector. One end of the clamp is connected with the main set test seat and the diversity test seat of the interface board through the radio frequency thimble, and the other end of the clamp is connected with the main set emission port and the diversity emission port of the test instrument through the radio frequency wire. The radio frequency wires can connect the main set SMA connector and the receiving port and/or connect the diversity SMA connector and the receiving port.

According to another aspect of the present invention, a method for testing radio frequency parameters is provided, which first determines a line loss value between a test socket and a test instrument port by using the line loss calibration method, and then tests radio frequency parameters of a mobile terminal based on the determined line loss value.

According to another aspect of the present invention, there is provided a radio frequency parameter testing system, comprising: the device comprises a mobile terminal mainboard, a comprehensive test instrument, a clamp, a power supply and computing equipment.

The mobile terminal mainboard comprises a radio frequency test seat. The comprehensive test instrument can test the radio frequency parameters of the mainboard of the mobile terminal and return the test result to the computing equipment. The clamp can be connected with a comprehensive test instrument through a radio frequency wire, connected with a radio frequency test seat through a radio frequency thimble, and used for providing power for the mobile terminal mainboard through a connecting power supply and transmitting a control signal to the mobile terminal mainboard through connecting computing equipment. The power source may provide power to the clamp. The computing device can transmit a control signal to the clamp, receive a test result returned by the comprehensive test instrument, and adjust the radio frequency parameter of the mobile terminal based on the test result.

By the scheme, the accuracy and the efficiency of the radio frequency test are improved. Because the attribute of the passive device is more stable, the condition of power fluctuation can not occur. The radio frequency line and the interface board with known line loss are used for replacing a golden machine, the topological line loss of the mobile terminal radio frequency test system is calibrated, and the topology does not need to be frequently disassembled. The test error can be reduced, and the quality of the terminal product is guaranteed.

Drawings

To the accomplishment of the foregoing and related ends, certain illustrative aspects are described herein in connection with the following description and the annexed drawings, which are indicative of various ways in which the principles disclosed herein may be practiced, and all aspects and equivalents thereof are intended to be within the scope of the claimed subject matter. The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description read in conjunction with the accompanying drawings. Throughout this disclosure, like reference numerals generally refer to like parts or elements.

FIG. 1 shows a schematic block diagram of a radio frequency parameter testing system 100 according to one embodiment of the present invention;

FIG. 2 shows a schematic block diagram of a line loss calibration system 200 according to one embodiment of the present invention;

fig. 3 shows a schematic diagram of an interface board 220 according to an embodiment of the invention;

FIG. 4 is a schematic circuit diagram of a test socket and SMA interface according to one embodiment of the invention;

FIG. 5 shows a schematic flow diagram of a line loss calibration method according to an embodiment of the invention;

fig. 6 shows a schematic flow diagram of a radio frequency parameter testing method according to an embodiment of the invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the production process of mobile terminals such as mobile phones, the main board calibration is the core of mobile phone production test and mainly includes radio frequency index calibration of a transmitter and a receiver. The rf parameter indicators generally include receive level, transmit power, frequency error, etc. The hardware deviation between the components of the printed circuit board causes the deviation of the radio frequency receiving and transmitting parameters. Calibration of the rf parameters generally uses a software parameter method to compensate for rf parameter deviations caused by hardware consistency deviations. The handset will call the calibrated parameters to optimize the performance of the radio frequency when the actual network is working. In order to improve the accuracy of the radio frequency parameter test, the scheme provides a line loss calibration method and a system.

FIG. 1 shows a schematic block diagram of a radio frequency parameter testing system 100 according to one embodiment of the present invention. As shown in fig. 1, the rf parametric test system 100 includes: the mobile terminal comprises a mobile terminal main board 110, a comprehensive test instrument 120, a clamp 130, a power supply 140, a computing device 150 and a radio frequency wire 160.

The main board 110 of the mobile terminal includes a radio frequency test socket 111. Generally, a printed circuit board of a mobile terminal is provided with a radio frequency test socket, and a test device can test the radio frequency performance of the mobile terminal through the radio frequency test socket. The rf test socket includes a base and a probe jack disposed on the base, and the integrated test instrument 120 connected to the thimble of the test fixture can test the rf parameters of the main board 110 of the mobile terminal and return the test result to the computing device 150. The fixture 130 may be connected to the integrated test instrument 120 through a radio frequency line 160, connected to the radio frequency test socket 111 through a radio frequency thimble 112, and used for providing power to the mobile terminal motherboard 110 through a connection power source 140 and transmitting control signals to the mobile terminal motherboard 110 through a connection computing device 150. The power supply 140 may supply power to the motherboard of the mobile terminal through the clip. The computing device 150 may transmit control signals to the fixture 130, receive test results returned by the integrated test instrument 120, and may adjust radio frequency parameters of the mobile terminal based on the test results.

Where the integrated test instrument 120 may include a plurality of ports, a first port RFCOM1 and a second port RFOUT1 are shown in fig. 1. When testing the performance of the handset receiver, the integrated test instrument 120 outputs a radio frequency signal for the handset to receive. When testing the performance of the handset transmitter, the integrated test instrument 120 receives and demodulates the signal transmitted by the handset. The computing device 150 may transmit the USB control signals to the mobile terminal through the clip 130 so that the mobile terminal transmits and receives power according to the control signals. The integrated test instrument 120 may return the test result to the computing device through the USB bus, and if the test result has a deviation, the computing device 150 may control the radio frequency parameter to adjust the index, and finally write the adjusted index into the memory of the mobile terminal.

The general mobile phone antenna adopts diversity reception technology, that is, two antennas are used on each frequency channel, the main set antenna is connected to the main set interface of the radio frequency module, and the diversity antenna is connected to the diversity reception interface of the radio frequency module. The main set is responsible for the transmission and reception of radio frequency signals, the diversity is only receiving and not transmitting, and the base station can combine the signals received from the two interfaces, thereby obtaining the receiving gain. Generally, 2G has no diversity, 3G may or may not be, and 4G must be. Therefore, the main line loss and the diversity line loss of the mobile phone antenna can be tested. Generally, a cable having a characteristic impedance of 50 ohms or 75 ohms can be used as the radio frequency line. That is to say a cable or radio frequency line that is capable of transmitting RF radio frequency signals without substantially affecting the quality of the radio frequency signals. When the mobile phone is used for radio frequency testing, the integrated test instrument 120 and the clamp 130 need to be connected through the radio frequency line 160.

The rf thimble 112 is pushed into the rf test socket 111, and can be connected to the main board of the mobile terminal by signals, so as to transmit the signals transmitted by the mobile terminal to the integrated test apparatus 120 and receive the signals transmitted by the integrated test apparatus 120. The integrated test instrument 120 has two modules of a signal source and a signal analyzer inside, and is connected to the clamp 130 through a port outside. The signal transmission paths are different in the two scenes of transmitting and receiving tests, and in order to obtain an accurate measurement result, the loss of a signal source, a signal analyzer and a clamp needs to be calibrated respectively.

Fig. 2 shows a schematic block diagram of a line loss calibration system 200 according to an embodiment of the invention. As shown in fig. 2, the line loss calibration system 200 may include: test instrument 210, interface board 220, anchor clamps, radio frequency line.

According to one embodiment of the invention, the test instrument 210 is a vector network analyzer. The vector network analyzer is a kind of electromagnetic wave energy testing equipment. The method can measure the amplitude and the phase of various parameters of the single-port network or the dual-port network. The vector network analyzer can also comprise a plurality of ports, three ports COM1, OUT1 and COM2 are used in the scheme, the COM1 or OUT1 can be used as a main set transmitting port and a diversity transmitting port for transmitting power, and the COM2 can be used as a receiving port for receiving power. Interface board 220 may include a radio frequency test socket, main set SMA connectors, and diversity SMA connectors. The main set SMA connector is connected with the main set test seat, and the diversity SMA connector is connected with the diversity test seat. One end of the clamp 130 is connected to the rf test socket of the interface board 220 through the rf thimble 111, and the other end is connected to the main set transmitting port COM1 and the diversity transmitting port OUT1 of the test instrument 210 through two rf lines. The main line loss of the whole topology can be tested by connecting the main set SMA connector with the COM2 by using radio frequency lines with known line loss values and/or the diversity line loss of the whole topology can be tested by connecting the diversity SMA connector with the COM 2.

The interface board 220 is manufactured according to the size of the main board of the mobile terminal, the position of the radio frequency test socket, the position of the mounting hole, the structure of the circuit topology, and the like. Fig. 3 shows a schematic diagram of an interface board 220 according to an embodiment of the invention. As shown in fig. 3, the interface board 220 may include three SMA connectors, including a main set SMA connector for testing antenna line loss, a diversity SMA connector, and a WiFi SMA connector for testing WiFi path line loss (not shown in this embodiment). The SMA radio antenna interface is called Sub-Miniature-A for short, and the antenna connector is a pin which is internally threaded and internally contacts (the external threaded and internally contacts at one end of the wireless device are tubes). The wireless device of this interface is the most popular, wherein the location of the rf test socket is completely consistent with the main board of the mobile terminal, so that the interface board 220 is completely placed in the fixture. The radio frequency thimble of anchor clamps can insert in the radio frequency test seat. In order to prevent the interface board from interfering with the fixture, the SMA connector may be extended outward for a certain distance, and other places interfering with the fixture, such as the power supply thimble, the USB transmission thimble, and some physical structures of the support, are hollowed out to ensure that the interface board 220 can be adapted to the fixture, and ensure that the rf thimble of the fixture is in good contact with the rf test socket. In addition, in order to ensure the height of the interface board is consistent with that of the main board of the mobile terminal, a shielding case bracket can be welded on the interface board.

According to an embodiment of the present invention, the test socket is connected to the SMA connector through a pi-type attenuation network, and a T-type attenuation network may also be used to implement signal attenuation and keep the input impedance unchanged, which is not limited herein. FIG. 4 shows a circuit schematic of a test socket interfacing with an SMA according to one embodiment of the invention. As shown in FIG. 4, the left side is a test seat, the right side is an SMA joint, and the middle is a pi-shaped attenuation network. The power levels involved in radio frequency transmission testing are generally high and high power signals must be attenuated to allow connection to the test equipment or cause damage to the test equipment. The pi-type attenuation network is a passive two-port network, and aims to reduce the mismatch between ports, ensure the impedance seen from a signal source end to be matched with the impedance of a signal source, and ensure the impedance seen from a load end to be matched with the impedance of a load. In addition, clearance treatment is required near the SMA joints, which can improve standing waves and reduce reflections.

After the interface board is manufactured according to the method, the line loss value between the test seat and the test instrument can be calibrated by using the interface board and the radio frequency line with the known line loss value, so that the radio frequency parameter of the mobile terminal is tested based on the line loss value between the test seat and the test instrument, and the radio frequency index of the mobile terminal is adjusted based on the test result.

Fig. 5 shows a schematic flow diagram of a line loss calibration method according to an embodiment of the invention. As shown in fig. 5, first, in step S510, a line loss value of an interface board may be measured by a test instrument, where the interface board includes at least a test socket and a radio antenna connector SMA connector connected to the test socket.

The interface board is also called a transfer card, has the same internal electrical characteristics with the mobile terminal mainboard to be tested, and can also provide frequency adjustment and voltage adjustment. The interface board mainly converts interfaces of different structures, for example, in the scheme, the thimble interface is converted into an SMA interface. The SMA connector has two forms, wherein the standard SMA connector is an external thread and a hole at one end, and an internal thread and a needle at the other end; the reversed polarity RP-SMA is one end of the 'external thread plus pin'. The SMA connector is suitable for connecting a radio frequency cable or a microstrip line in a radio frequency loop of microwave equipment and a digital communication system. The interface of a general clamp is a thimble, so that the clamp is connected with a radio frequency test seat of an interface board through the thimble and then connected with a test instrument through an SMA interface, and the line loss of the clamp can be tested. The line loss is tested, and the prototype can be calibrated only after the line loss value exists.

As shown in fig. 2, COM1 and OUT1 ports of a test instrument are generally used for calibrating radio frequency parameters in a production line, wherein the COM1 is used for a main set and the OUT1 is used for a diversity set. The COM2 port is idle, COM1 and OUT1 power are adopted in the scheme, a COM2 receiving method is used, main set test line loss is power transmitted through COM1, COM2 receiving power is received, diversity test line loss is power transmitted through OUT1, and COM2 receiving power is received. The line loss from the RF socket to the port of the test instrument is calculated by calculating the power difference between the transmitted and received signals.

The test socket can comprise a main set test socket and a diversity test socket, correspondingly, the SMA connector can comprise a main set SMA connector and a diversity SMA connector, and the main set SMA connector and the diversity SMA connector are respectively connected with the main set test socket and the diversity test socket through an attenuation network.

The line loss of each frequency band of the main diversity of the interface board can be measured by using a vector network analyzer. Since the frequency of transmitting or receiving wireless signals in the wireless product corresponds to the frequency band supported by the product, each frequency band referred to herein corresponds to the frequency supported by the product, for example, the frequency band supported by the mobile phone supports LTE B1 (transmitting frequency 1920-.

According to one embodiment of the invention, one end of a vector network analyzer (vector network for short) is connected with a main set test seat through a buckle wire, and the other end of the vector network analyzer is connected with a main set SMA connector through a radio frequency wire, so that a main set line loss value of a port network is measured. One end of the buckle wire is a joint capable of being matched with the test seat, and the other end of the buckle wire is an SMA joint. For a two-port network, there are four S-parameters, i.e., scattering parameters. Is an important parameter in microwave transmission. S12 is the reverse transmission coefficient, i.e. isolation. S21 is the forward transmission coefficient, i.e., the gain. S11 is the input reflection coefficient, i.e., the input return loss, and S22 is the output reflection coefficient, i.e., the output return loss. The line loss value of the two-port network is the line loss value between port 1 and port 2 at the time of test S21, i.e., S21 on the vector net. S21 is an S matrix parameter of the 2-port network, which characterizes the line loss value of the entire two-port network and represents the line loss value of the connection portion between two ports of the vector network. The S-parameters of radio frequency components are typically measured using a Vector Network Analyzer (VNA).

And then calculating the main line loss value of the interface board based on the main line loss value of the two-port network, the line loss value of the deduction line and the line loss value of the radio frequency line. The main line loss value of the interface board is equal to the S21 test value minus the line loss value of the buckle line and the line loss value of the radio frequency line of the SMA joints at the two ends, and can be recorded as C1.

Similarly, one end of the vector network can be connected with the diversity test seat through a buckle wire, and the other end of the vector network is connected with the diversity SMA connector through a radio frequency wire, so that the diversity line loss value of the two-port network can be measured. And calculating the diversity line loss value of the interface board based on the diversity line loss value of the network, the line loss value of the connecting line and the line loss value of the radio frequency line, and recording the diversity line loss value as C2. Wherein, both C1 and C2 are negative values.

Then, in step S520, the port error of the test instrument can be measured by the test instrument and the radio frequency line with known line loss value.

Since the power transmitted by COM1 and OUT1 has an error with the power actually received by COM2, it is necessary to correct the port error by calibration. According to one embodiment of the invention, the main set transmitting port COM1 and the receiving port COM2 can be connected through a radio frequency line, the main set transmitting port transmits a first predetermined power, and the first receiving power of the receiving port is measured. The diversity transmit port OUT1 and the receive port COM2 are connected by a radio frequency line such that the diversity transmit port transmits a first predetermined power and the receive port measures a second received power.

A main-set port error of the test instrument may be calculated based on the first predetermined power, the first received power, and the line loss value of the radio frequency line. And calculating the diversity port error of the test instrument based on the first preset power, the second received power and the line loss value of the radio frequency line.

For example, the vector network can be controlled to emit a-5 dbm CW wave, which is a continuous wave radio frequency signal, and is actually a sine wave as a carrier wave. In the practical process, other values can be selected, firstly, an excessively low power value cannot be selected, so that the testing accuracy is easily influenced by environmental fluctuation, and secondly, high power cannot be selected without limit because the maximum transmitting power of the vector network signal generator is limited. In summary, the allowable range of the vector network can be selected as much as possible to obtain larger power. Setting the line loss value of the radio frequency line as C, the line loss value of the radio frequency line as a negative value, setting the received first received power and the received second received power as a1 and a2, respectively, setting main set port errors (COM1 to COM2) as C3, and setting diversity port errors (OUT1 to COM2) as C4, and then setting C3 to a1+ 5-C; c4 ═ a2+ 5-C.

Subsequently, in step S530, a line loss value between the test socket and the port of the test instrument may be determined based on the line loss value of the interface board, the line loss value of the radio frequency line, and the port error of the test instrument.

According to one embodiment of the invention, the main set SMA connector and the receiving port can be connected through a radio frequency wire, so that the main set transmitting port transmits a second predetermined power, and a third receiving power of the receiving port is measured. And connecting the diversity SMA connector and the receiving port through a radio frequency wire, enabling the diversity transmitting port to transmit second preset power, and measuring fourth receiving power of the receiving port.

As shown in fig. 2, when the main set line loss is tested, one end of the radio frequency line is connected to a COM2 port of the meter, and the other end is connected to a main set SMA connector of the interface board. The control vector net emits-5 dBm CW waves from COM1 and OUT1, respectively, and records the power received by the meter from COM2, and the third received power and the fourth received power may be denoted as B1, B2, respectively. The power of other values can be used, the same power is transmitted when the error of the port of the test instrument is detected, calculation is convenient, if the same power is transmitted, the transmitted power of-5 dBm can be finally offset, and the actually obtained line loss has no relation with the power transmitted by the instrument.

Calculating a main line loss value between the test socket and the port of the test instrument based on the third received power, the error of the main line loss port, the line loss value of the radio frequency line, the main line loss value of the interface board and the second predetermined power; and calculating the diversity line loss value between the test seat and the port of the test instrument based on the fourth received power, the diversity port error, the line loss value of the radio frequency line, the diversity line loss value of the interface board and the second preset power.

The overall path loss of the main set, L1 ═ B1+ 5-C1-C3, and the path loss of the diversity, L2 ═ B2+ 5-C2-C4, can be calculated. When the first predetermined power is equal to the second predetermined power, that is, the transmission power is consistent when the line loss is measured in steps S510 and S520, the main line loss value between the main transmission port test socket and the test instrument port is the difference between the third received power and the first received power, and the main line loss value of the interface board; and the diversity line loss value between the test seat and the port of the test instrument is the difference value of the fourth receiving power, the second receiving power and the diversity line loss value of the interface board.

C3 ═ a1+5-C due to previous calculations; c4 ═ a2+ 5-C. So that L1-B1-A1-C1, L2-B2-A2-C2; wherein, B1, B2, A1 and A2 are all measured power values, and C1 and C2 are measured line loss values on the interface board. The radio frequency lines used in the scheme are all radio frequency lines with known line loss values. Therefore, the line loss from the main set test socket to the instrument port COM1 and from the diversity test socket to the instrument port OUT1 when the main board of the terminal is moved during actual use of the clamp for testing can be obtained. From the above calculation results, the line loss of the rf line is cancelled, and the line loss value of the rf line does not need to be known as long as the rf line with the same line loss value is used for calibration in the line loss test process (i.e., it is ensured that the line used for the error calibration of the instrument port and the line used for the final line loss calibration are the same).

The interface board is only used for measuring the line loss, and after the line loss is measured, the interface board is taken down and put into a mobile phone mainboard, and the mobile phone is calibrated by using the line loss obtained through the test. Fig. 6 shows a schematic flow diagram of a radio frequency parameter testing method according to an embodiment of the invention. As shown in fig. 6, in step S600, the radio frequency parameters of the mobile terminal are tested based on the line loss value between the test socket and the test instrument port obtained by the line loss calibration method. The test system may be constructed according to the normal operational flow of the production line test. As shown in fig. 1, the radio frequency thimble of the fixture is inserted into the test seat of the mobile terminal motherboard, and then can be connected with the mobile phone signal, and the mobile phone emission signal is connected to the thimble and transmitted to the test instrument, so as to complete the test of the radio frequency parameters of the mobile phone.

The scheme is simple to operate, the interface board is used for replacing a gold machine, the condition that the gold machine is damaged after power fluctuation or long-term use is avoided, the test topology does not need to be frequently disassembled, and only a free port of a test instrument is needed to be connected with a radio frequency line for line loss calibration.

A10, the method as in any one of A1-9, wherein the test instrument is a vector network analyzer.

A12, a radio frequency parameter testing method, wherein, comprising: obtaining a line loss value between the test socket and the port of the test instrument using a line loss calibration method as described in any of a 1-10; and testing the radio frequency parameters of the mobile terminal based on the obtained line loss value.

A13, a radio frequency parameter testing system, wherein, includes: the mobile terminal mainboard comprises a radio frequency test seat; the comprehensive test instrument is suitable for testing the radio frequency parameters of the mobile terminal mainboard and returning a test result to the computing equipment; the clamp is suitable for being connected with the comprehensive test instrument through a radio frequency wire, connected with the radio frequency test seat through a radio frequency thimble, used for providing power for the mobile terminal mainboard through a connecting power supply and used for transmitting a control signal to the mobile terminal mainboard through connecting computing equipment; a power source adapted to provide power to the clamp; and the computing equipment is suitable for transmitting the control signal to the clamp and receiving the test result returned by the comprehensive test instrument.

It should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.

The various techniques described herein may be implemented in connection with hardware or software or, alternatively, with a combination of both. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, may take the form of program code (i.e., instructions) embodied in tangible media, such as floppy diskettes, CD-ROMs, hard drives, or any other machine-readable storage medium, wherein, when the program is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing the invention.

In the case of program code execution on programmable computers, the computing device will generally include a processor, a storage medium readable by the processor (including volatile and non-volatile memory and/or storage elements), at least one input device, and at least one output device. Wherein the memory is configured to store program code; the processor is configured to perform the method of the present invention according to instructions in the program code stored in the memory.

By way of example, and not limitation, computer readable media may comprise computer storage media and communication media. Computer-readable media includes both computer storage media and communication media. Computer storage media store information such as computer readable instructions, data structures, program modules or other data. Communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media. Combinations of any of the above are also included within the scope of computer readable media.

Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.

Unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.

Claims

1. A line loss calibration method is suitable for a mobile terminal, wherein the method comprises the following steps:

the line loss value of the interface board is measured through the test instrument, the interface board includes test seat and the radio antenna who is connected with the test seat connects SMA at least, the test seat includes main collection test seat and diversity test seat, SMA connects including main collection SMA connects and diversity SMA connects, main collection SMA connects and diversity SMA connects to be connected with main collection test seat and diversity test seat through the decay network respectively, the step of measuring the line loss value of interface board through the test instrument includes:

connecting one end of the test instrument with the main set test seat through a buckle wire, and connecting the other end of the test instrument with the main set SMA connector through a radio frequency wire to measure a main set line loss value of the two-port network;

calculating a main line concentration loss value of the interface board based on a main line concentration loss value of the two-port network, a line loss value of the line deduction and a line loss value of the radio frequency line; and

connecting one end of the test instrument with the diversity test seat through a buckle wire, and connecting the other end of the test instrument with the diversity SMA connector through a radio frequency wire to obtain a diversity line loss value of the two-port network;

calculating the diversity line loss value of the interface board based on the diversity line loss value of the two-port network, the line loss value of the connecting line and the line loss value of the radio frequency line;

measuring a port error of a test instrument through the test instrument and a radio frequency line with a known line loss value; and

determining a line loss value between the test seat and a port of the test instrument based on the line loss value of the interface board, the line loss value of the radio frequency line and the port error of the test instrument;

and calibrating the mobile phone according to the line loss value between the test seat and the port of the test instrument.

2. The method of claim 1, wherein the radio frequency wire has SMA joints at both ends.

3. The method of claim 1, the test instrument comprising at least a main set transmit port, a diversity transmit port, and a receive port, wherein the step of measuring a port error of the test instrument through the test instrument and the radio frequency wire having the SMA contact comprises:

connecting the main set transmitting port and the receiving port through a radio frequency line, enabling the main set transmitting port to transmit first preset power, and measuring first receiving power of the receiving port;

connecting the diversity transmitting port and the receiving port through a radio frequency line, enabling the diversity transmitting port to transmit first preset power, and measuring second receiving power of the receiving port;

calculating a main set port error of the test instrument based on the first preset power, the first received power and the line loss value of the radio frequency line; and

and calculating the diversity port error of the test instrument based on the first preset power, the second received power and the line loss value of the radio frequency line.

4. The method of claim 3, wherein,

the main set port error is a difference value between the first received power and the first predetermined power and a line loss value of a radio frequency line;

the diversity port error is a difference value between the second received power and the first predetermined power and a line loss value of the radio frequency line.

5. The method of claim 4, wherein the step of determining the line loss value between the test socket and the port of the test instrument based on the line loss value of the interface board, the line loss value of the radio frequency line, and the port error of the test instrument comprises:

connecting the SMA connector and the receiving port of the main set through a radio frequency wire, enabling the transmitting port of the main set to transmit second preset power, and measuring third receiving power of the receiving port;

connecting a diversity SMA joint and a receiving port through a radio frequency wire, enabling the diversity transmitting port to transmit second preset power, and measuring fourth receiving power of the receiving port; and

calculating a main line loss value between the test socket and the port of the test instrument based on the third received power, the error of the main line port, the line loss value of the radio frequency line, the main line loss value of the interface board and a second predetermined power;

and calculating the diversity line loss value between the test socket and the port of the test instrument based on the fourth received power, the diversity port error, the line loss value of the radio frequency line, the diversity line loss value of the interface board and a second preset power.

6. The method of claim 5, wherein,

the main line loss value between the test seat and the port of the test instrument is the difference value between the third received power and the second preset power, the main line loss value of the interface board, the line loss value of the radio frequency line and the error of the main line port;

and the diversity line loss value between the test seat and the port of the test instrument is the difference between the fourth received power and the second preset power, the diversity line loss value of the interface board, the line loss value of the radio frequency line and the error of the diversity port.

7. The method of claim 5, wherein when the first predetermined power is equal to the second predetermined power and the line loss values of the RF lines are the same,

the main line concentration loss value between the test seat and the port of the test instrument is the difference value of the third receiving power, the first receiving power and the main line concentration loss value of the interface board;

and the diversity line loss value between the test seat and the port of the test instrument is the difference value between the fourth received power and the second received power and the diversity line loss value of the interface board.

8. The method of any one of claims 1-7, wherein the test instrument is a vector network analyzer.

9. A line loss calibration system, comprising:

the test instrument comprises a main set transmitting port, a diversity transmitting port and a receiving port, and is suitable for transmitting power through the main set transmitting port and the diversity transmitting port and testing the receiving power of the receiving port so as to measure a port error of the test instrument through a radio frequency line with a known line loss value;

the interface board comprises a main set testing seat, a main set SMA connector, a diversity testing seat and a diversity SMA connector, wherein the main set SMA connector and the diversity SMA connector are respectively connected with the main set testing seat and the diversity testing seat through an attenuation network, and the line loss value of the interface board is measured through the testing instrument;

one end of the clamp is connected with the main set test seat and the diversity test seat of the interface board through a radio frequency thimble, and the other end of the clamp is connected with a main set emission port and a diversity emission port of a test instrument through a radio frequency line;

the radio frequency line is suitable for connecting the main set SMA connector and the receiving port, and the diversity SMA connector and the receiving port;

the line loss value of the interface board is measured by the interface board through the test instrument, and the line loss value is as follows:

the system determines a line loss value between the test seat and the port of the test instrument based on the line loss value of the interface board, the radio frequency line with the known line loss value and the port error of the test instrument, and calibrates the mobile phone according to the line loss value between the test seat and the port of the test instrument.

10. A radio frequency parameter testing method comprises the following steps:

obtaining a line loss value between the test socket and the port of the test instrument using a line loss calibration method as claimed in any one of claims 1 to 8;

and testing the radio frequency parameters of the mobile terminal based on the obtained line loss value.

11. A radio frequency parametric test system, comprising:

the mobile terminal mainboard comprises a radio frequency test seat, wherein the radio frequency test seat comprises a test seat and a radio antenna joint SMA joint connected with the test seat, the test seat comprises a main set test seat and a diversity test seat, the SMA joint comprises a main set SMA joint and a diversity SMA joint, and the main set SMA joint and the diversity SMA joint are respectively connected with the main set test seat and the diversity test seat through an attenuation network;

the comprehensive test instrument is suitable for testing the radio frequency parameters of the mobile terminal mainboard and returning a test result to the computing equipment;

the clamp is suitable for being connected with the comprehensive test instrument through a radio frequency wire, connected with the radio frequency test seat through a radio frequency thimble, used for providing power for the mobile terminal mainboard through a connecting power supply and used for transmitting a control signal to the mobile terminal mainboard through connecting computing equipment;

a power source adapted to provide power to the clamp;

the computing equipment is suitable for transmitting a control signal to the clamp and receiving a test result returned by the comprehensive test instrument;

the testing the radio frequency parameters of the mobile terminal mainboard comprises the following steps:

manufacturing an interface board consistent with the mobile terminal mainboard;

testing the line loss value between the test seat and the test instrument based on the interface board and the radio frequency line with known line loss value;

testing the radio frequency parameters of the mainboard of the mobile terminal based on the line loss value between the test seat and the test instrument;

the line loss value of the interface board is measured by a test instrument as follows:

and calculating the diversity line loss value of the interface board based on the diversity line loss value of the two-port network, the line loss value of the connecting and buckling line and the line loss value of the radio frequency line.