CN108594018A - The method and system of usb signal line characteristic impedance in a kind of test board - Google Patents
The method and system of usb signal line characteristic impedance in a kind of test board Download PDFInfo
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- CN108594018A CN108594018A CN201810507651.8A CN201810507651A CN108594018A CN 108594018 A CN108594018 A CN 108594018A CN 201810507651 A CN201810507651 A CN 201810507651A CN 108594018 A CN108594018 A CN 108594018A
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- usb
- characteristic impedance
- signal line
- test
- usb signal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
Abstract
The present invention provides a kind of method and system of usb signal line characteristic impedance in test board, the described method comprises the following steps：S1, setting measurement jig；S2, vector network analyzer is connect with measurement jig by cable, measurement jig USB interface is plugged into the USB port to be measured of mainboard；S3, regulating networks analyzer, make waveform completely be displayed on the screen centre；S4, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic impedance value；S5, cable are switched to another pair SMA connectors, complete next group of usb signal line characteristic impedance test；After S6, the corresponding usb signal characteristic impedance of some USB port of completion mainboard, it is plugged into other USB ports successively and completes all usb signal characteristic impedances tests on mainboard.The present invention solves the problems, such as to be directed to usb signal line impedence difficulty of test in the prior art big and complexity is high, realizes and reduces difficulty of test, improve testing efficiency, shortens test period.
Description
Technical field
The present invention relates to signal wire testing field, in especially a kind of test board the method for usb signal line characteristic impedance and
System.
Background technology
As usb communication rate is higher and higher, whether characteristic impedance also becomes abnormal important in accordance with design value.Therefore it takes
Being engaged in, also when the river rises the boat goes up therewith for the importance and necessity that device mainboard usb signal line characteristic impedance is tested.Usb signal in testing host
Whether the circuit board of line characteristic impedance, the production of verification PCB manufacturers is qualified, ensures server product quality.
Usb signal line impedence test and comparison bothers in mainboard at present.Firstly, it is necessary to test position is found in schematic diagram,
The coating for scraping PCB circuit board surface off with scraper, allow test position exposing become to lead, then use vector network analyzer into
Row test.When test, according to the specific location of test point, test probe probe spacing is adjusted, by the probe points of probe in advance
The test point scraped is tested, and probe contacts nor very stable in test.Moreover, practical lastblock mainboard
It is filled up by various components, mainboard surface is filled with the barriers such as solder joint and various component stitch, can also increase test
Difficulty.In addition, the test position of part usb signal line is also covered by USB and network interface compages component, it is very unlikely to survey
Examination, increased difficulty of test is well imagined thus.
Current test method is relatively specific for test one signal line or a small amount of signal wire, but needs to test and a plurality of be
To multiple mainboard usb signal lines characteristic impedance when, due to test substantial amounts, when being tested by current test method, need
It takes a significant amount of time and error-prone.Therefore when existing means of testing carries out mainboard usb signal line characteristic impedance test, not only take
When it is laborious, and efficiency is very low.In addition to this, because of the position relationship of part usb signal line, it can be used as the position of test point
It is covered by component, difficulty of test is very big.
Invention content
The object of the present invention is to provide a kind of method and systems of usb signal line characteristic impedance in test board, it is intended to solve
It is directed to the problem that usb signal line impedence difficulty of test is big and complexity is high in the prior art, realizes and reduces difficulty of test, improves
Testing efficiency shortens test period.
To reach above-mentioned technical purpose, the present invention provides a kind of method of usb signal line characteristic impedance in test board, packets
Include following steps：
S1, setting measurement jig；
S2, vector network analyzer is connect with measurement jig by cable, measurement jig USB interface is plugged into mainboard
USB port to be measured；
S3, regulating networks analyzer, make waveform completely be displayed on the screen centre；
S4, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic impedance value；
S5, cable are switched to another pair SMA connectors, complete next group of usb signal line characteristic impedance test；
After S6, the corresponding usb signal characteristic impedance of some USB port of completion mainboard, it is plugged into the completion of other USB ports successively
All usb signal characteristic impedance tests on mainboard.
Preferably, the setting measurement jig specifically includes following operation：
Pcb board is set and A mouthfuls of male connectors of standard USB are set, according to the position of USB interface PIN foot, design two inside PCB
To the differential pair signal line of 1000hm, itself TX and RX signal is drawn out in pcb board, and terminate SMA connector male heads.
Preferably, the both threads length difference of the differential pair is less than 5mil.
Preferably, further include calibrating vector network analyzer before the step S2.
The present invention also provides a kind of systems of usb signal line characteristic impedance in test board, including：
Measurement jig module, for measurement jig to be arranged；
Plug-in module, for vector network analyzer to be connect with measurement jig by cable, measurement jig USB interface is inserted
It is connected to the USB port to be measured of mainboard；
Waveform position adjusts module, is used for regulating networks analyzer, waveform is made completely to be displayed on the screen centre；
Impedance logging modle, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic
Impedance value；
It is special to complete next group of usb signal line for cable to be switched to another pair SMA connectors for cable handover module
Property testing impedance；
USB interface handover module is inserted successively after completing the corresponding usb signal characteristic impedance of mainboard some USB port
It is connected to other USB ports and completes all usb signal characteristic impedance tests on mainboard.
Preferably, the measurement jig module includes：
PCB and USB public affairs mouth setting units, for pcb board and setting A mouthfuls of male connectors of standard USB, the inside PCB basis to be arranged
The position of USB interface PIN foot；
Differential pair signal line setting unit, the differential pair signal line for designing two couples of 1000hm, by itself TX and RX signal
It is drawn out in pcb board, and terminates SMA connector male heads.
Preferably, the both threads length difference of the differential pair is less than 5mil.
Preferably, the system also includes calibration modules, for calibrating vector network analyzer.
The effect provided in invention content is only the effect of embodiment, rather than invents all whole effects, above-mentioned
A technical solution in technical solution has the following advantages that or advantageous effect：
Compared with prior art, the present invention is by being arranged measurement jig and utilizing vector network analyzer and measurement jig phase
Connection, and the measurement jig other end is connected into mainboard USB interface, to the impedances of TX RX differential pairs in mainboard into traveling wave
Shape records, and carries out impedance value reading crawl.And cable need to be only switched to another pair SMA connectors, you can complete next group
Usb signal line characteristic impedance test.It is big and multiple for usb signal line impedence difficulty of test in the prior art to solve
The high problem of miscellaneous degree, realizes and reduces difficulty of test, improve testing efficiency, shorten test period.This method principle is simple, jig system
Facilitate；In testing host usb signal line impedence, can first time test target impedance, save and additional look for signal wire
Position, scrape a little etc. needed for manpower, the time, substantially increase testing efficiency, be simple and efficient.
Description of the drawings
Fig. 1 is that the USB3.0 interface signals provided in the embodiment of the present invention define schematic diagram；
Fig. 2 be the embodiment of the present invention provided in a kind of test board in usb signal line characteristic impedance method flow diagram；
Fig. 3 is a kind of measurement jig structural schematic diagram provided in the embodiment of the present invention；
Fig. 4 be the embodiment of the present invention provided in a kind of test board in usb signal line characteristic impedance system structure frame
Figure.
Specific implementation mode
In order to clearly illustrate the technical characterstic of the present invention, below by specific implementation mode, and its attached drawing is combined, to this
Invention is described in detail.Following disclosure provides many different embodiments or example is used for realizing the different knots of the present invention
Structure.In order to simplify disclosure of the invention, hereinafter the component of specific examples and setting are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relationship between various embodiments and/or setting is discussed.It should be noted that illustrated component is not necessarily to scale in the accompanying drawings
It draws.Present invention omits the descriptions to known assemblies and treatment technology and process to avoid the present invention is unnecessarily limiting.
The method for being provided for the embodiments of the invention usb signal line characteristic impedance in a kind of test board below in conjunction with the accompanying drawings
It is described in detail with system.
As shown in Fig. 2, the embodiment of the invention discloses a kind of methods of usb signal line characteristic impedance in test board, including
Following steps：
S1, setting measurement jig；
S2, vector network analyzer is connect with measurement jig by cable, measurement jig USB interface is plugged into mainboard
USB port to be measured；
S3, regulating networks analyzer, make waveform completely be displayed on the screen centre；
S4, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic impedance value；
S5, cable are switched to another pair SMA connectors, complete next group of usb signal line characteristic impedance test；
After S6, the corresponding usb signal characteristic impedance of some USB port of completion mainboard, it is plugged into the completion of other USB ports successively
All usb signal characteristic impedance tests on mainboard.
USB communication protocol defines standard USB interface, and used at present is the A mouthfuls of definition of USB3.0 standards, such as Fig. 1 institutes
Show.According to definition, in standard USB communication protocol, there is the characteristic impedance of two pairs of high speed signals to test, TX and RX.It is main
End meeting grafting A mouthfuls of females of standard USB of usb signal line on plate, corresponding interface can be with the one-to-one phase of signal wire in plate
It connects.
Measurement jig is set to replace testing impedance to pop one's head in, specifically includes following operation：
Pcb board is set and A mouthfuls of male connectors of standard USB are set, according to the position of USB interface PIN foot, design two inside PCB
To the differential lines of 1000hm, itself TX and RX signal is drawn out in pcb board, and terminate SMA connector male heads, two of differential pair
Line length difference is less than 5mil, and two pairs of differential lines are respectively designated as TX+/TX-, RX+/RX-.The measurement jig simplified schematic diagram is such as
Shown in Fig. 3.
When carrying out usb signal line characteristic impedance test, vector network analyzer and associated cable are calibrated first,
The parameters of the display interface of vector network analyzer are set, one end connected vector Network Analyzer of cable is then used,
The SMA connectors of other end connecting test jig.Another interface of measurement jig, that is, USB public access mouths are inserted into mainboard mother USB and connect
Mouthful, at this point, vector network analyzer can show the impedance waveform of TX RX differential pairs in mainboard, and carries out reading and grab
It takes, you can complete test.
At this point, by cable switching to another pair SMA connectors, you can complete the USB interface whole usb signal line characteristic
The test of impedance.Due to more than one USB interface on mainboard, the interface of measurement jig need to only be inserted mutually with mainboard interface
The test of all usb signal line characteristic impedances on one piece of mainboard can be completed by pulling out.Due in development phase, generally can all have more
Block mainboard needs to test, and this method will avoid constantly looking for a little, scrapes trifling step a little, not only convenient but also can precisely test.
The embodiment of the present invention with measurement jig is connected by setting measurement jig and using vector network analyzer, and will
The measurement jig other end connects mainboard USB interface, to carry out waveform recording to the impedance of TX RX differential pairs in mainboard, and
Carry out impedance value reading crawl.And cable need to be only switched to another pair SMA connectors, you can complete next group of usb signal
Line characteristic impedance is tested.To solve, to be directed to usb signal line impedence difficulty of test in the prior art big and complexity is high
Problem is realized and reduces difficulty of test, and testing efficiency is improved, and shortens test period.Usb signal line to be measured can be tested whenever and wherever possible
Characteristic impedance.Without excessive early-stage preparations, so that it may which testing host usb signal line characteristic impedance judges PCB manufacturer's systems with this
Whether the pcb board usb signal line impedence of work meets design object, ensures product quality, in addition this method principle is simple, jig system
Facilitate；In testing host usb signal line impedence, can first time test target impedance, save and additional look for signal wire
Position, scrape a little etc. needed for manpower, the time, substantially increase testing efficiency, be simple and efficient.
As shown in figure 4, the system that the embodiment of the present invention additionally provides usb signal line characteristic impedance in a kind of test board, packet
It includes：
Measurement jig module, for measurement jig to be arranged；
Plug-in module, for vector network analyzer to be connect with measurement jig by cable, measurement jig USB interface is inserted
It is connected to the USB port to be measured of mainboard；
Waveform position adjusts module, is used for regulating networks analyzer, waveform is made completely to be displayed on the screen centre；
Impedance logging modle, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic
Impedance value；
It is special to complete next group of usb signal line for cable to be switched to another pair SMA connectors for cable handover module
Property testing impedance；
USB interface handover module is inserted successively after completing the corresponding usb signal characteristic impedance of mainboard some USB port
It is connected to other USB ports and completes all usb signal characteristic impedance tests on mainboard.
The measurement jig module includes：
PCB and USB public affairs mouth setting units, for pcb board and setting A mouthfuls of male connectors of standard USB, the inside PCB basis to be arranged
The position of USB interface PIN foot；
Differential pair signal line setting unit, the differential pair signal line for designing two couples of 1000hm, by itself TX and RX signal
It is drawn out in pcb board, and terminates SMA connector male heads, the both threads length difference of the differential pair is less than 5mil.
The system also includes calibration modules, for calibrating vector network analyzer.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (8)
1. a kind of method of usb signal line characteristic impedance in test board, which is characterized in that include the following steps：
S1, setting measurement jig；
S2, vector network analyzer is connect with measurement jig by cable, measurement jig USB interface is plugged into the to be measured of mainboard
USB port；
S3, regulating networks analyzer, make waveform completely be displayed on the screen centre；
S4, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic impedance value；
S5, cable are switched to another pair SMA connectors, complete next group of usb signal line characteristic impedance test；
After S6, the corresponding usb signal characteristic impedance of some USB port of completion mainboard, it is plugged into other USB ports successively and completes mainboard
Upper all usb signal characteristic impedance tests.
2. the method for usb signal line characteristic impedance in a kind of test board according to claim 1, which is characterized in that described
Setting measurement jig specifically includes following operation：
Pcb board is set and A mouthfuls of male connectors of standard USB are set, according to the position of USB interface PI N feet inside PCB, designs two pairs
Itself TX and RX signal is drawn out in pcb board, and terminates SMA connector male heads by the differential pair signal line of 1000hm.
3. the method for usb signal line characteristic impedance in a kind of test board according to claim 2, which is characterized in that described
The both threads length difference of differential pair is less than 5mi l.
4. the method for usb signal line characteristic impedance in a kind of test board according to claim 1 or 2, which is characterized in that
Further include calibrating vector network analyzer before the step S2.
5. the system of usb signal line characteristic impedance in a kind of test board, which is characterized in that including：
Measurement jig module, for measurement jig to be arranged；
Plug-in module, for vector network analyzer to be connect with measurement jig by cable, measurement jig USB interface is plugged into
The USB port to be measured of mainboard；
Waveform position adjusts module, is used for regulating networks analyzer, waveform is made completely to be displayed on the screen centre；
Impedance logging modle, the mark function for calling vector network analyzer check simultaneously wave recording, read characteristic impedance
Value；
Cable handover module completes next group of usb signal line characteristic resistance for cable to be switched to another pair SMA connectors
Anti- test；
USB interface handover module is plugged into successively after completing the corresponding usb signal characteristic impedance of mainboard some USB port
Other USB ports complete all usb signal characteristic impedance tests on mainboard.
6. the system of usb signal line characteristic impedance in a kind of test board according to claim 5, which is characterized in that described
Measurement jig module includes：
PCB and USB public affairs mouth setting units, for pcb board to be arranged and A mouthfuls of male connectors of standard USB are arranged, according to USB inside PCB
The position of interface PIN foot；
Differential pair signal line setting unit, the differential pair signal line for designing two couples of 1000hm draw itself TX and RX signal
Into pcb board, and terminate SMA connector male heads.
7. the system of usb signal line characteristic impedance in a kind of test board according to claim 6, which is characterized in that described
The both threads length difference of differential pair is less than 5mi l.
8. the system of usb signal line characteristic impedance in a kind of test board according to claim 5, which is characterized in that described
System further includes calibration module, for calibrating vector network analyzer.
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| CN201810507651.8A CN108594018A (en) | 2018-05-24 | 2018-05-24 | The method and system of usb signal line characteristic impedance in a kind of test board |
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| CN201810507651.8A CN108594018A (en) | 2018-05-24 | 2018-05-24 | The method and system of usb signal line characteristic impedance in a kind of test board |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109656862A (en) * | 2018-11-20 | 2019-04-19 | 山东超越数控电子股份有限公司 | A kind of USB2.0 protocol analyzer and analysis method based on FPGA |
| CN110596616A (en) * | 2019-10-12 | 2019-12-20 | 上海泽丰半导体科技有限公司 | Power supply impedance test method and circuit board |
| CN114252703A (en) * | 2021-11-19 | 2022-03-29 | 苏州浪潮智能科技有限公司 | Method, device and system for removing far-end crosstalk influence of transmission line on jig plate |
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Application publication date: 20180928 |