CN103995183B - A kind of PCB layout impedance continuity detection method based on fast-pulse response - Google Patents
A kind of PCB layout impedance continuity detection method based on fast-pulse response Download PDFInfo
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- CN103995183B CN103995183B CN201410249268.9A CN201410249268A CN103995183B CN 103995183 B CN103995183 B CN 103995183B CN 201410249268 A CN201410249268 A CN 201410249268A CN 103995183 B CN103995183 B CN 103995183B
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Abstract
The invention discloses a kind of PCB layout impedance continuity detection method based on fast-pulse response, with control theory as the strong point, with reference to the critical electrical factor such as impulse response, signal reflex, derivative controller is built, the differentiation element of derivative controller is adjusted, fast step pulse is produced；The fast step pulse is introduced directly into routing path input to be measured on pcb board by mainboard power-off, builds low pass filter, and the signal to routing path output end to be measured on pcb board carries out high-frequency filtering, collection and discrete sampling；Discrete sampling value to output end signal carries out Fourier transformation, obtain output signal spectrum, and compared with the frequency spectrum after the input signal conversion having, confirm impedance discontinuity point on the pcb board cabling, carry out the Continuous Adjustment of impedance, settlement server mainboard is in high speed PCB test, it is impossible to the problem of impedance uniform continuity, it is ensured that high efficiency, the low cost of server PCB layout impedance detection.
Description
Technical field
The present invention relates to computer communication field, specifically a kind of PCB layout impedance based on fast-pulse response
Method for detecting continuity.
Background technology
The signal speed design more and more higher of current pcb board, high speed signal is distributed in the various pieces of mainboard, carries
System interconnection and the task of information exchange, the designing quality of high speed signal directly affects the transmission quality of signal, PCB on pcb board
The continuity of the wiring impedance of signal determines that what can signal smooth passes to control receiving terminal on plate, if wiring impedance does not connect
It is continuous, the phenomenons such as the error code of signal are will appear from, controller can constantly carry out the repeating transmission interconnection action of data, cause the transmission of data
Efficiency is low, and one group of data needs to send and repeatedly could correctly transmit, and the transmission performance bottleneck problem of system is following, and this is just needed
Fundamentally to accelerate the continuity design of signal routing impedance on pcb board.
Current server system for signal routing impedance on the high-speed transfer demand of data, pcb board optimization design,
It is increasingly becoming transmission, the operational performance key factor of influence server signal.Current usual way is using hand inspection PCB
Signal routing mode, i.e., ensure that the wiring impedance of signal is continuous, so as far as possible according to artificial experience and existing design rule
Eye pattern afterwards further according to signal and the measured data of performance, further confirm that whether signal is stablized, and which has test cannot
The region of covering, i.e., when needing initialization to start, eye pattern test data cannot be oriented action of giving out a contract for a project, but now system pair
The transmission stability requirement of data is higher, cannot now confirm whether eye pattern is normal, normal through being commonly present the test of normal eyes figure, and
Initialize the problem of several forthright interruptions.This single eye pattern and performance actual measurement mode, it is impossible to realize PCB signal routings quality one
Cause property demand；It is continuously increased with to the requirement of server system data high-speed transfer, in order to ensure the stabilization fortune of server system
OK, in practical operation running, realize that the PCB signal routings impedance continuity detection of system is particularly important, and as certainly
Determine one of key element of server system transmission performance.
The content of the invention
For the above mentioned problem run into during current server system PCB signal routing quality testings, the present invention is proposed
A kind of PCB layout impedance continuity detection method based on fast-pulse response.
A kind of PCB layout impedance continuity detection method based on fast-pulse response of the present invention, solves above-mentioned skill
The technical scheme that art problem is used is as follows：The PCB layout impedance continuity detection method based on fast-pulse response, to control
It is the strong point that system is theoretical, and current server mainboard is solved with reference to the critical electrical such as impulse response, signal reflex factor at a high speed
In PCB layout test process, it is impossible to the problem of impedance uniform continuity；The master of the PCB layout impedance continuity detection method
Wanting content includes：
1. derivative controller is built, the differentiation element of derivative controller is adjusted, it is the fast step of 2ns to produce the rise time
Pulse, the level magnitudes of pulse are 1V；
2. under mainboard powering-off state, above-mentioned fast step pulse is introduced directly into routing path input to be measured on pcb board
End, and the corresponding element device of erecting and welding on pcb board, i.e. test object are the PCB layout of the server master board that can normally work；
3. low pass filter is built, the signal to routing path output end to be measured on pcb board carries out high-frequency filtering, collection,
Discrete sampling is carried out to output end signal using the analog-digital converters of 10；
4. the discrete sampling value to routing path output end signal to be measured on pcb board carries out Fourier transformation, is changed into frequency
Domain analysis, obtains output signal spectrum；
5. the frequency spectrum by output signal spectrum after the input signal conversion having compares, according to the difference on spectral image
It is different, confirm there is impedance discontinuity point on the pcb board cabling, the Continuous Adjustment of impedance is carried out, such as adjust width, the mistake of cabling
The number in hole etc..
The beneficial effect that a kind of PCB layout impedance continuity detection method based on fast-pulse response of the present invention has
Really：
PCB layout impedance continuity detection method based on fast-pulse response of the present invention, solves current service
Device mainboard is in high speed PCB test process, it is impossible to the problem of impedance uniform continuity, it is ensured that server PCB layout hinders
The high efficiency of anti-detection, low cost, realize server master board wiring reliability, stability Design, for server high speed cabling
Signal quality lifting have great importance.
Brief description of the drawings
Accompanying drawing 1 is the schematic diagram of the derivative controller；
Accompanying drawing 2 is the implementing procedure figure of the PCB layout impedance continuity detection method based on fast-pulse response.
Specific embodiment
To make the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
It is a kind of based on fast-pulse response PCB layout impedance continuity detection method be described in detail.
PCB layout impedance continuity detection method based on fast-pulse response of the present invention, is branch with control theory
Support point, solves currently in server master board in high speed PCB with reference to the critical electrical such as impulse response, signal reflex factor
In test process, it is impossible to the problem of impedance uniform continuity；The main contents bag of the PCB layout impedance continuity detection method
Include：
1. derivative controller is built, the differentiation element of derivative controller is adjusted, it is the fast step of 2ns to produce the rise time
Pulse, the level magnitudes of pulse are 1V；
2. under mainboard powering-off state, above-mentioned fast step pulse is introduced directly into routing path input to be measured on pcb board
End, is the impedance conditions under test actual working state, must the corresponding element device of erecting and welding, i.e. test object on pcb board
It is the PCB layout of server master board that can normally work；
3. low pass filter is built, the signal to routing path output end to be measured on pcb board carries out high-frequency filtering, collection,
Discrete sampling is carried out to output end signal using the analog-digital converters of 10；
4. the discrete sampling value to routing path output end signal to be measured on pcb board carries out Fourier transformation, is changed into frequency
Domain analysis, obtains output signal spectrum；
5. the frequency spectrum by output signal spectrum after the input signal conversion having compares, according to the difference on spectral image
It is different, confirm there is impedance discontinuity point on the pcb board cabling, carry out the Continuous Adjustment of impedance.
Embodiment：
Detected based on the PCB layout impedance continuity that fast-pulse is responded to of the present invention below by one embodiment
The advantage and design content of method, are described in detail：
In this implementation, derivative controller is built first, the differentiation element of regulation derivative controller (as shown in Figure 1) is produced
The raw rise time is the fast step pulse of 2ns, and the level magnitudes of pulse are 1V, in existing derivative controller, is adjusted micro-
Point link is the inductance value for controlling inductance, signal is risen edge delays and shortens, to prevent pulse from producing shadow to the device on mainboard
Ring, the level magnitudes of pulse are controlled in 1V；
Under mainboard powering-off state, above-mentioned fast step pulse is introduced directly into routing path input to be measured on pcb board,
Need to control within 30mm from derivative controller to the length of routing path input to be measured；Consider via and component's feet
To the actual influence of signal transduction, the corresponding element device of necessary erecting and welding on pcb board, i.e. test object can normally work
The PCB layout of server master board；
1MHZ low pass filters are built, high-frequency filtering is carried out to the signal of routing path output end to be measured on pcb board, is adopted
Collection, routing path output end is chosen for the layout PAD points of the chip receiving terminal of signal, while considering signal end reflection
Influence, is accurately to obtain detection data, the connection of cut-off signal cabling and chip；Correspondence input signal, output end signal 1M with
Above for the signal of more than 1MHZ is carried out frequency filter by High-frequency Interference using low pass filter, using the analog-digital converter pair of 10
Output end signal carries out discrete sampling, i.e., the measurement for carrying out output amplitude at regular intervals is preserved, and preserves an output signal
Time, amplitude bivariate table；
Carrying out discrete sampling value to output end signal carries out Fourier transformation, is changed into frequency-domain analysis, obtains output signal
Frequency spectrum, is to split with the time by the time of output signal, amplitude bivariate table to reduce operand with reference to Fourier transformation method
Unit carries out segment processing, and each section of points as sampling are 30, it is ensured that the conversion accuracy after conversion, realize efficient computing
Conversion；
Frequency spectrum of the output signal spectrum after the input signal conversion having is compared, according to the difference on spectral image
It is different, that is, find out the abnormity point that spectral magnitude variable quantity exceedes the input signal 50% having, the lasting frequency of observed anomaly point
Scope, if lasting frequency range is in more than 100HZ, confirms to have impedance discontinuity point on the PCB trace, it is necessary to be hindered
Anti- Continuous Adjustment, such as adjusts width, the number of via of cabling.
Accompanying drawing 1 is the implementation stream of the PCB layout impedance continuity detection method based on fast-pulse response of the present invention
Cheng Tu, as shown in Figure 1, the implementing procedure of the PCB layout impedance continuity detection method is as follows：1. research and development engineer builds micro-
Sub-controller, adjusts the differentiation element of derivative controller, and inductance value is generally located on 16 μ H, and it is the fast of 2ns to produce the rise time
Fast step pulse, the level magnitudes of pulse are 1V, are measured by oscillograph and confirmed；
2. mainboard is powered off, above-mentioned fast step pulse is introduced directly into routing path input to be measured on pcb board；3. take
1MHZ low pass filters are built, the signal to routing path output end to be measured on pcb board carries out high-frequency filtering, collection, using 10
Analog-digital converter discrete sampling is carried out to output end signal；
4. the discrete sampling value to output end signal carries out Fourier transformation, is changed into frequency-domain analysis, obtains output signal
Frequency spectrum；
5. the frequency spectrum by output signal spectrum after the input signal conversion having compares, according to the difference on spectral image
It is different, confirm there is impedance discontinuity point on the pcb board cabling.
By implementation process detailed above, the PCB layout impedance continuity based on fast-pulse response of the present invention
Detection method, can easily realize high efficiency, the low-cost design of server PCB layout impedance detection, and biography has not been only reached
The requirement of defeated detection, and low cost, low latency requirement are realized, realize reliability, the stability of server PCB layout impedance.
Above-mentioned specific embodiment is only specific case of the invention, and scope of patent protection of the invention is included but is not limited to
Above-mentioned specific embodiment, any person of an ordinary skill in the technical field that meet claims of the present invention and any
The appropriate change or replacement done to it, should all fall into scope of patent protection of the invention.
Claims (6)
1. it is a kind of based on fast-pulse response PCB layout impedance continuity detection method, with control theory as the strong point, with reference to
Impulse response, signal reflex critical electrical factor, it is characterised in that the PCB layout impedance continuity detection method it is main in
Appearance includes：
1. derivative controller is built, the differentiation element of derivative controller is adjusted, it is the fast step arteries and veins of 2ns to produce the rise time
Punching, the level magnitudes of pulse are 1V；
2. under mainboard powering-off state, above-mentioned fast step pulse is introduced directly into routing path input to be measured on pcb board, and
The corresponding element device of erecting and welding, i.e. test object are the PCB layout of the server master board that can normally work on pcb board；
3. low pass filter is built, the signal to routing path output end to be measured on pcb board carries out high-frequency filtering, collection, uses
The analog-digital converter of 10 carries out discrete sampling to output end signal；
4. the discrete sampling value to routing path output end signal to be measured on pcb board carries out Fourier transformation, is changed into frequency domain point
Analysis, obtains output signal spectrum；
5. the frequency spectrum by output signal spectrum after the input signal conversion having compares, according to the difference on spectral image,
Confirm there is impedance discontinuity point on the pcb board cabling, carry out the Continuous Adjustment of impedance.
2. a kind of PCB layout impedance continuity detection method based on fast-pulse response according to claim 1, it is special
Levy and be, build derivative controller, adjust the differentiation element of derivative controller, inductance value is arranged on 16 μ H, produces the rise time
It is the fast step pulse of 2ns, the level magnitudes of pulse are 1V, are measured by oscillograph and confirmed.
3. a kind of PCB layout impedance continuity detection method based on fast-pulse response according to claim 2, it is special
Levy and be, under mainboard powering-off state, the fast step pulse is introduced directly into routing path input to be measured on pcb board,
From derivative controller to the control of the length of routing path input to be measured within 30mm.
4. a kind of PCB layout impedance continuity detection method based on fast-pulse response according to claim 3, it is special
Levy and be, build 1MHZ low pass filters, the signal to routing path output end to be measured on pcb board carries out high-frequency filtering, collection,
Routing path output end is chosen for the layout PAD points of the chip receiving terminal of signal, and cut-off signal cabling and chip company
Connect；Correspondence input signal, carries out frequency filter, using the mould of 10 using low pass filter by the output end signal of more than 1MHZ
Number converter carries out discrete sampling to output end signal, i.e., the measurement for carrying out output amplitude at regular intervals is preserved, and preserves one
Open time, the amplitude bivariate table of output signal.
5. a kind of PCB layout impedance continuity detection method based on fast-pulse response according to claim 4, it is special
Levy and be, the discrete sampling value to routing path output end signal to be measured on pcb board carries out Fourier transformation, be changed into frequency domain point
Analysis, obtains output signal spectrum, with reference to Fourier transformation method, by the time of output signal, amplitude bivariate table with the time to divide
Cutting unit carries out segment processing, and each section of points as sampling are 30.
6. a kind of PCB layout impedance continuity detection method based on fast-pulse response according to claim 5, it is special
Levy and be, frequency spectrum of the output signal spectrum after the input signal conversion having is compared, according to the difference on spectral image,
Find out the abnormity point that spectral magnitude variable quantity exceedes the input signal 50% having, the lasting frequency model of observed anomaly point
Enclose, if lasting frequency range is in more than 100HZ, confirm there is impedance discontinuity point on the PCB trace, and carry out impedance
Continuous Adjustment, adjusts width, the number of via of cabling.
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| CN107194093A (en) * | 2017-05-27 | 2017-09-22 | 郑州云海信息技术有限公司 | A kind of design method of high speed board inter-connection links |
| CN111381104A (en) * | 2018-12-29 | 2020-07-07 | 中兴通讯股份有限公司 | Method and device for measuring impedance of transmission channel |
| CN111679127A (en) * | 2020-06-11 | 2020-09-18 | 江苏华创微系统有限公司 | High-speed digital electric connection channel impedance on-line monitoring method |
| CN111786564B (en) * | 2020-07-15 | 2022-03-01 | 江苏能华微电子科技发展有限公司 | High efficiency compact quick charging source |
| CN113092867A (en) * | 2021-03-29 | 2021-07-09 | 上海橙科微电子科技有限公司 | Method, system and medium for testing continuity of impedance of light module transmission system through square wave |
| CN113449478B (en) * | 2021-06-24 | 2024-05-03 | 深圳市一博科技股份有限公司 | Simulation method for obtaining via delay |
| CN114137388B (en) * | 2021-11-25 | 2024-05-28 | 深圳市三田技术科技有限公司 | Circuit board signal trace-searching detection system |
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