CN106872744A - The measuring method and measuring system of a kind of differential signal - Google Patents
The measuring method and measuring system of a kind of differential signal Download PDFInfo
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- CN106872744A CN106872744A CN201710100228.1A CN201710100228A CN106872744A CN 106872744 A CN106872744 A CN 106872744A CN 201710100228 A CN201710100228 A CN 201710100228A CN 106872744 A CN106872744 A CN 106872744A
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- signal
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- test point
- detectable signal
- time delay
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
Abstract
The invention discloses a kind of measuring method of differential signal, comprise the following steps：S10, according to signal wave produced during a test point on two single-ended probe detection circuit plates, eliminate the time delay between two single-ended probes correspondence signal waves；S20, using eliminating two single-ended probes after time delay, two on detection circuit plate at test point when produce positive and negative detectable signal；S40, according to the positive and negative detectable signal, calculate the differential signal at the test point.The present invention has the advantages that simple structure, small volume, easy to use due to single-ended probe, and single-ended probe is more suitable for circuit board of the component than comparatively dense, can be detected in narrow zone on circuit boards.When differential signal is tested, after the time delay between eliminating two single-ended probes, during using two single-ended probe probing test points, positive and negative detectable signal is produced；Further according to positive and negative detectable signal, so as to calculate differential signal.
Description
Technical field
The invention belongs to signal measurement technique field, the more particularly to measuring method and measuring system of differential signal.
Background technology
At present, differential signal has turned into signal measurement must survey item, especially differential clock signal.Differential clock signal
It is the Main Basiss of chip writing address/operation such as command signal or write/read data-signal.Wherein, on intelligent terminal often
The differential clock signal seen has bus clock signal and memory chip clock signal etc..Therefore, the measurement of differential clock signal is just
Become particularly important.
Because difference probe has the advantages that bandwidth, fidelity, availability, common mode inhibition, general measure differential signal
Method is measured using difference probe, and either point contact type difference probe or welded type difference probe, make difference probe
Positive pole reliably termination contacts the positive signal of differential signal, reliably termination contacts the negative letter of differential signal for the negative pole of difference probe
Number, capture waveform using oscillograph.
But as the development of science and technology, the encapsulation of component are less and less, the design of hardware circuit diagram is more and more multiple
It is miscellaneous；Also, differential probe structure is complex, volume is larger, using inconvenient.Using poor by the way of point is touched or is welded
Point probe seems relatively difficult measuring differential clock signal.
Its difficulty is：(1), when point contact type measurement differential signal is carried out using difference probe, easily made because of hand shaking
Significantly shaken into signal, or cause short circuit so that differential probe cannot be detected in narrow zone on circuit boards.
(2), when welded type measurement differential clock signal is carried out using difference probe, in the case where component is than comparatively dense, will visit
When rod is welded on test position, its welding difficulty is significantly increased, and easily causes short circuit.
The content of the invention
The technical scheme that the present invention is provided is as follows：
The present invention provides a kind of measuring method of differential signal, comprises the following steps：S10, visited according to two single-ended probes
Signal wave produced during a test point on slowdown monitoring circuit plate, eliminates the time delay between two single-ended probe correspondence signal waves；S20、
Using eliminating two single-ended probes after time delay, two on detection circuit plate at test point when produce positive and negative detectable signal；S40, root
According to the positive and negative detectable signal, the differential signal at the test point is calculated.
Further, the step S10 is further included：S11, detect same on the circuit boards using two single-ended probes
During test point, there are two bars ripples of time delay in generation；S12, the corresponding signal waveform of two bars ripples of adjustment, eliminate two letters
Time delay between number ripple.
Further, also included before the step S40：S30, according to the corresponding positive and negative spy of the positive and negative detectable signal
Signal wave is surveyed, identifies whether the waveform of the positive and negative detectable signal ripple is consistent with the waveform for presetting positive and negative detectable signal ripple；
If the waveform of the positive and negative detectable signal ripple is consistent with the waveform of default detectable signal ripple, step S40 is jumped to.
Further, it is further comprising the steps of：S50, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal,
The relevant parameter of the positive and negative detectable signal ripple is obtained, the relevant parameter includes frequency, peak value, valley.
Further, also included before the step S10：S01, test point at two is found out on the circuit board；
S02, two single-ended probes are connected to test point at two, two isometric ground wires, two isometric ground wires are welded on and lean on
At the same position of the nearly test point.
The present invention also provides a kind of measuring system of differential signal, including two single-ended probes, oscillographs, the oscillograph
Also include：Time delay cancellation module, for according to signal wave produced during a test point on two single-ended probe detection circuit plates,
Eliminate the time delay between two single-ended probe correspondence signal waves；Signal generator module, two lists after time delay are eliminated for utilizing
End probe, two on detection circuit plate at test point when produce positive and negative detectable signal；Signal of change module, for according to it is described just,
Negative detectable signal, calculates the differential signal at the test point.
Further, the signal generator module, is additionally operable to detect same survey on the circuit board using two single-ended probes
During pilot, there are two bars ripples of time delay in generation；The time delay cancellation module, is additionally operable to the corresponding letter of two bars ripples of adjustment
Number waveform, eliminates the time delay between two bars ripples.
Further, the oscillograph also includes：Waveform recognition module, for corresponding according to the positive and negative detectable signal
Positive and negative detectable signal ripple, identify the positive and negative detectable signal ripple waveform whether with preset positive and negative detectable signal ripple ripple
Shape is consistent.
Further, the signal of change module, is additionally operable to according to the corresponding positive and negative detection letter of the positive and negative detectable signal
Number ripple, obtains the relevant parameter of the positive and negative detectable signal ripple, and the relevant parameter includes frequency, peak value, valley.
Further, two single-ended probes are connected to test point at two, two isometric ground wires, test point position at two
In on the circuit board；Two isometric ground wires are welded at the same position of the test point.
Compared with prior art, the measuring method and measuring system of a kind of differential signal that the present invention is provided, with following
Beneficial effect：
1), the present invention has the advantages that simple structure, small volume, easy to use due to single-ended probe, and single-ended probe is more
Circuit board suitable for component than comparatively dense, can be detected in narrow zone on circuit boards.When differential signal is tested,
After the time delay between eliminating two single-ended probes, during using two single-ended probe probing test points, two single-ended probe difference
The positive and negative holding wire of differential signal is measured, positive and negative detectable signal is produced；Further according to positive and negative detectable signal, so as to calculate go on business
Sub-signal.
2), the present invention detects same test point and produces the two bars ripples with certain time-delay using two single-ended probes；
The time delay between two bars ripples is eliminated by adjusting the corresponding signal waveform of two bars ripples；So that two single-ended
Do not exist time delay between probe, to obtain accurate differential signal.
3) when, the present invention utilizes the positive and negative detectable signal of single-ended probe probing test point, positive and negative detectable signal is identified
Waveform it is whether correct；After the waveform of positive and negative detectable signal is correct, then calculate differential signal；To ensure to obtain correct poor
Sub-signal.
4) it is, of the invention after test point is found out, after two single-ended probes are connected with test point, ground wire, you can measurement
Go out on the positive and negative holding wire of error of measurement sub-signal, the positive and negative detectable signal of generation.
Brief description of the drawings
Below by clearly understandable mode, preferred embodiment is described with reference to the drawings, to a kind of measurement of differential signal
The above-mentioned characteristic of method and measuring system, technical characteristic, advantage and its implementation are further described.
Fig. 1 is a kind of schematic flow sheet of the measuring method of differential signal of the invention；
Fig. 2 be differential signal of the present invention measuring method in step S10 schematic flow sheet；
Fig. 3 is the schematic flow sheet of the measuring method of another differential signal of the invention；
Fig. 4 is the schematic flow sheet of the measuring method of another differential signal of the invention；
Fig. 5 be a kind of differential signal of the invention measuring system in oscillograph composition structural representation.
Drawing reference numeral explanation：
21st, time delay cancellation module, 22, signal generator module, 23, waveform recognition module, 24, signal of change module.
Specific embodiment
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, control is illustrated below
Specific embodiment of the invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing, and obtain other implementation methods.
To make simplified form, part related to the present invention is only schematically show in each figure, they are not represented
Its as product practical structures.In addition, so that simplified form is readily appreciated, there is identical structure or function in some figures
Part, only symbolically depicts one of those, or has only marked one of those.Herein, " one " is not only represented
" only this ", it is also possible to represent the situation of " more than one ".
As shown in Figure 1 and Figure 2, according to one embodiment of present invention, a kind of measuring method of differential signal, including it is following
Step：S10, according to signal wave produced during a test point on two single-ended probe detection circuit plates, eliminate two single-ended spies
Time delay between rod correspondence signal wave；The circuit board includes printing board PCB.
Preferably, step S10 is further included：S11, detect same test on the circuit boards using two single-ended probes
During point datat+ or datat-, there are two bars ripples of time delay in generation；
S12, the corresponding signal waveform of two bars ripples of adjustment, eliminate the time delay between two bars ripples.
S20, using eliminating two single-ended probes after time delay, two on detection circuit plate at test point datat+, datat-
When produce positive and negative detectable signal；
S40, according to the positive and negative detectable signal, calculate the differential signal at the test point.
Specifically, differential transfer is a kind of technology of signal transmission, traditional piece ground wire of a holding wire is different from
Way, differential transfer all transmission signal in this both threads, the amplitude of the two signals is equal, opposite in phase.In this both threads
The signal of upper transmission is exactly differential signal.Two inputs of differential probe have an end resistors, and single-ended probe is only
There are an end resistors in signal input part, without resistor (be then the resistance of 0 Ω in actual probe in ground wire
Device).Compared with single-ended probe, difference probe is more expensive, using less convenient.
As shown in Figure 2 and Figure 3, according to another embodiment of the invention, a kind of measuring method of differential signal, including with
Lower step：S10, according to signal wave produced during a test point on two single-ended probe detection circuit plates, eliminate two it is single-ended
Time delay between probe correspondence signal wave；
Preferably, step S10 is further included：S11, detect same test on the circuit boards using two single-ended probes
During point datat+ or datat-, there are two bars ripples of time delay in generation；
S12, the corresponding signal waveform of two bars ripples of adjustment, eliminate the time delay between two bars ripples.
S20, using eliminating two single-ended probes after time delay, two on detection circuit plate at test point datat+, datat-
When produce positive and negative detectable signal；
S30, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, identify the positive and negative detection letter
Whether the waveform of number ripple is consistent with the waveform for presetting positive and negative detectable signal ripple；If the waveform of the positive and negative detectable signal ripple with it is pre-
If the waveform of detectable signal ripple is consistent, step S40 is jumped to.
S40, according to the positive and negative detectable signal, calculate the differential signal at the test point.
As shown in Figure 2, Figure 4 shows, according to still a further embodiment, a kind of measuring method of differential signal, including with
Lower step：S01, on the circuit board determine component position, find out test point datat+, datat- at two；
S02, two single-ended probes are connected to test point datat+, datat- at two, two isometric ground wires,
At least two isometric ground wires are welded at the same position of the test point.
S10, according to signal wave produced during a test point on two single-ended probe detection circuit plates, eliminate two it is single-ended
Time delay between probe correspondence signal wave；
Preferably, step S10 is further included：S11, detect same test on the circuit boards using two single-ended probes
During point datat+ or datat-, there are two bars ripples of time delay in generation；
S12, the corresponding signal waveform of two bars ripples of adjustment, eliminate the time delay between two bars ripples.
S20, using eliminating two single-ended probes after time delay, two on detection circuit plate at test point datat+, datat-
When produce positive and negative detectable signal；
Preferably, including S30, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, identify described
Whether the waveform of positive and negative detectable signal ripple is consistent with the waveform of default detectable signal ripple；If the ripple of the positive and negative detectable signal ripple
When shape is consistent with the waveform of default detectable signal ripple, step S40 is jumped to.
S40, according to the positive and negative detectable signal, calculate the differential signal at the test point.
S50, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, obtain the positive and negative detectable signal ripple
Relevant parameter, the relevant parameter include frequency, peak value, valley；Repeat the above steps, open sunset glow, and accumulated signal 1000
Pen, and recall the relevant parameter of required measurement.
The relevant parameter can also include cycle, positive pulse width, negative pulse width, the rise time, fall time, account for
The parameter such as empty ratio, monotonicity, peak-to-peak value, maximum, minimum value, high level, low value.To ensure the quality of differential signal, difference letter
Number line cabling on a printed circuit has certain requirement：Differential signal cabling must be it is isometric, wide, in close proximity to and
In the both threads of same aspect.
Same position near test point on product single board welds two isometric ground wires, determines differential clock signal
Test position, connects ground wire, captures the positive and negative signal of differential clock signal respectively using two single-ended probes, obtains substantially
Differential clock signal.
As shown in figure 5, according to one embodiment of present invention, a kind of measuring system of differential signal, including two single-ended
Probe, oscillograph, the oscillograph also include：Preferably, two single-ended probes are connected to test point datat at two
+, datat-, two isometric ground wires, at two test point datat+, datat- be located at the circuit board on；Two isometric ground wire bondings
It is connected at the same position of the test point.
Time delay cancellation module, for according on two single-ended probe detection circuit plates during a test point datat+ or datat-
Produced signal wave, eliminates the time delay between two single-ended probe correspondence signal waves；
Preferably, also including signal generator module, it is additionally operable to detect same on the circuit board using two single-ended probes
During test point, there are two bars ripples of time delay in generation；
The time delay cancellation module, is additionally operable to the adjustment corresponding signal waveform of two bars ripples, eliminate two bars ripples it
Between time delay.
Signal generator module, for using eliminating two single-ended probes after time delay, two on detection circuit plate at test point
Positive and negative detectable signal is produced when datat+, datat-；
Preferably, also include：Waveform recognition module, for according to the corresponding positive and negative detection letter of the positive and negative detectable signal
Number ripple, identifies whether the waveform of the positive and negative detectable signal ripple is consistent with the waveform of default detectable signal ripple.
Signal of change module, for according to the positive and negative detectable signal (when the positive and negative detectable signal ripple waveform with
When the waveform of default detectable signal ripple is consistent), calculate the differential signal at the test point.
Preferably, the signal of change module, is additionally operable to according to the corresponding positive and negative detection letter of the positive and negative detectable signal
Number ripple, obtains the relevant parameter of the positive and negative detectable signal ripple, and the relevant parameter includes frequency, peak value, valley.
According to one embodiment of present invention, a kind of measuring method of differential signal, comprises the following steps：
The calibration of single-ended probe：Differential clock signal is into, it is necessary to use two single-ended spies by positive and negative two signal line groups
Rod is measured.
May there is certain time delay between two single-ended probes, this time delay can influence trembling for the differential signal for measuring
The accuracy of dynamic and level.Firstly the need of the time delay eliminated between probe.Probe is calibrated exactly in order to eliminate probe it
Between time delay, call the deskew functions of oscillograph to eliminate the time delay between probe.
Measure the positive and negative signal of difference：To ensure the quality of differential signal, differential signal line cabling on a printed circuit
There is certain requirement；Differential signal cabling must be it is isometric, wide, in close proximity to and same aspect both threads.
Same position near test point on product single board welds two isometric ground wires, determines differential clock signal
Test position, connects ground wire, captures the positive and negative signal of differential clock signal respectively using two single-ended probes, thus
Substantially differential clock signal is obtained.
The operation of oscillograph：The measurable waveform of oscillograph, the frequency selection according to measured signal is adapted to the oscillograph of bandwidth.
Certain setting is carried out to oscillograph：The Math functions of oscillograph are called, using the calculation subtracted each other, will be captured
The passage of positive signal subtracts the passage of crawl negative signal, and acquisition is exactly differential signal.After obtaining normal differential clock signal,
Open sunset glow and add up 1000, and recall required test parameter.
Single-ended probe just can be used to complete the test of differential clock signal according to above step.Differential clock signal with it is general
The difference of clock signal be that differential clock signal is, the holding wire (positive and negative signal) of opposite in phase equal by two amplitudes
Composition, that is to say, that its holding wire has two.Two single-ended probes are needed to measure.Using two single-ended probes be for
Signal is measured, it is necessary to the computing function subtracted each other using oscillograph, subtracts each other the differential clocks letter that the waveform that obtains is only needs
Number, as long as next recalling required test parameter, carry out normal test.
It should be noted that above-described embodiment can independent assortment as needed.The above is only of the invention preferred
Implementation method, it is noted that for those skilled in the art, is not departing from the premise of the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of measuring method of differential signal, it is characterised in that comprise the following steps：
S10, according to signal wave produced during a test point on two single-ended probe detection circuit plates, eliminate two single-ended probes
Time delay between correspondence signal wave；
S20, using eliminating two single-ended probes after time delay, two on detection circuit plate at test point when produce positive and negative detection letter
Number；
S40, according to the positive and negative detectable signal, calculate the differential signal at the test point.
2. the measuring method of differential signal as claimed in claim 1, it is characterised in that the step S10 is further included：
S11, when detecting same test point on the circuit boards using two single-ended probes, there are two bars of time delay in generation
Ripple；
S12, the corresponding signal waveform of two bars ripples of adjustment, eliminate the time delay between two bars ripples.
3. the measuring method of differential signal as claimed in claim 1, it is characterised in that also included before the step S40：
S30, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, identify the positive and negative detectable signal ripple
Waveform whether with preset positive and negative detectable signal ripple waveform it is consistent；
If the waveform of the positive and negative detectable signal ripple is consistent with the waveform of default detectable signal ripple, step S40 is jumped to.
4. the measuring method of differential signal as claimed in claim 1, it is characterised in that further comprising the steps of：
S50, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, obtain the phase of the positive and negative detectable signal ripple
Related parameter, the relevant parameter includes frequency, peak value, valley.
5. the measuring method of the differential signal as described in any one in Claims 1 to 4, it is characterised in that in the step
Also include before S10：
S01, test point at two is found out on the circuit board；
S02, two single-ended probes are connected to test point at two, two isometric ground wires, two isometric ground wire bondings
At the same position of the test point.
6. a kind of measuring system of differential signal, including two single-ended probes, oscillographs, it is characterised in that the oscillograph is also
Including：
Time delay cancellation module, for according to signal wave produced during a test point on two single-ended probe detection circuit plates, disappearing
Except the time delay between two single-ended probe correspondence signal waves；
Signal generator module, for using eliminating two single-ended probes after time delay, two on detection circuit plate at test point when produce
The positive and negative detectable signal of life；
Signal of change module, for according to the positive and negative detectable signal, calculating the differential signal at the test point.
7. the measuring system of differential signal as claimed in claim 6, it is characterised in that：
The signal generator module, when being additionally operable to detect same test point on the circuit board using two single-ended probes, produces
There are two bars ripples of time delay；
The time delay cancellation module, is additionally operable to the corresponding signal waveform of two bars ripples of adjustment, between two bars ripples of elimination
Time delay.
8. the measuring system of differential signal as claimed in claim 6, it is characterised in that the oscillograph also includes：
Waveform recognition module, for according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, identify it is described just,
Whether the waveform of negative detectable signal ripple is consistent with the waveform for presetting positive and negative detectable signal ripple.
9. the measuring system of differential signal as claimed in claim 6, it is characterised in that：
The signal of change module, is additionally operable to, according to the corresponding positive and negative detectable signal ripple of the positive and negative detectable signal, obtain institute
The relevant parameter of positive and negative detectable signal ripple is stated, the relevant parameter includes frequency, peak value, valley.
10. the measuring system of the differential signal as described in any one in claim 6~9, it is characterised in that：
Two single-ended probes are connected to test point at two, two isometric ground wires, and test point is located at the circuit at two
On plate；Two isometric ground wires are welded at the same position of the test point.
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| CN201710100228.1A CN106872744A (en) | 2017-02-23 | 2017-02-23 | The measuring method and measuring system of a kind of differential signal |
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| CN201710100228.1A CN106872744A (en) | 2017-02-23 | 2017-02-23 | The measuring method and measuring system of a kind of differential signal |
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Application publication date: 20170620 |