CN113466673A - Channel transmission delay difference measurement system and method - Google Patents

Channel transmission delay difference measurement system and method Download PDF

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CN113466673A
CN113466673A CN202111035770.6A CN202111035770A CN113466673A CN 113466673 A CN113466673 A CN 113466673A CN 202111035770 A CN202111035770 A CN 202111035770A CN 113466673 A CN113466673 A CN 113466673A
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channel
measuring
phase
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CN113466673B (en
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魏津
胡雪原
鄢书丹
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Shenke Semiconductor Technology Suzhou Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2851—Testing of integrated circuits [IC]
    • G01R31/2882—Testing timing characteristics

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Abstract

The invention discloses a system and a method for measuring channel transmission delay difference, comprising the following steps: a reference channel; a plurality of channels to be tested; a measurement module comprising a first measurement line, a second measurement line, and a plurality of node phase measurement units, wherein: each node phase measurement unit acquires signals of a corresponding reference node and a corresponding measurement node as a pair of input signals, and converts the signals into direct-current voltage values according to the phase difference between the pair of input signals; the data processing module is used for fitting the corresponding direct-current voltage values according to the node number sequence to obtain a triangular wave function; and the data analysis module substitutes the direct-current voltage value output by each node phase measurement unit into the triangular wave function respectively to obtain the transmission delay difference value of the final channel to be detected relative to the reference channel. The method and the device accurately obtain the transmission delay difference between the channels by utilizing the fitting of the multi-point phase measurement result.

Description

Channel transmission delay difference measurement system and method
Technical Field
The invention relates to the technical field of integrated circuit testing, in particular to a system and a method for measuring channel transmission delay difference.
Background
In an automatic tester of an integrated circuit, due to the influence of factors such as transmission delay difference, wiring difference and the like in a digital test channel, the problem of time consistency among the channels is caused, the inconsistency can cause inaccuracy of a test result, and the test efficiency and yield of the whole system module are reduced. Therefore, a time measurement method is needed to be provided to measure the inherent time delay difference of each channel, the problem of the consistency of the transmission time of the multi-channel signals is solved through time calibration (AC calibration), and the inherent time difference of the multi-channel signal transmission of the digital circuit is corrected.
The traditional measurement only adopts the inherent delay of a single-point measurement channel, but the error of the single-point measurement is large, and the delay difference between the channels cannot be accurately measured, so that the later calibration is inaccurate, and the efficiency and the accuracy of the test equipment are influenced.
Disclosure of Invention
The invention aims to provide a system and a method for measuring channel transmission delay difference, which are used for accurately obtaining the transmission delay difference between channels by utilizing the fitting of a multipoint phase measurement result.
In order to solve the above technical problem, the present invention provides a channel transmission delay difference measurement system, including:
a reference channel outputting a reference signal;
a plurality of channels to be tested, at least one channel to be tested exists at the current moment, and the channel to be tested outputs a detection signal synchronous with the reference signal;
a measurement module comprising a first measurement line, a second measurement line, and a plurality of node phase measurement units, wherein:
the first measurement line is connected to the reference channel and provided with a plurality of reference nodes, the reference nodes sequentially carry out node numbering according to the arrival sequence of the reference signals, and the reference signals have the same time difference after passing through the adjacent reference nodes;
the second measurement line is connected to the current channel to be measured and is provided with measurement nodes in one-to-one correspondence with the reference nodes, the detection signals have the same time difference when passing through the adjacent measurement nodes, and the time difference on the second measurement line is different from that on the first measurement line;
each node phase measuring unit is arranged between a group of corresponding reference nodes and measuring nodes, obtains signals of the group of corresponding reference nodes and measuring nodes as a pair of input signals, and converts the signals into direct-current voltage values according to phase differences between the pair of input signals;
the data processing module is connected to the measuring module, measures and records the direct-current voltage values output by all the node phase measuring units, and fits the corresponding direct-current voltage values according to the node number sequence and the triangular wave to obtain a triangular wave function;
and the data analysis module is used for respectively substituting the direct-current voltage value output by each node phase measurement unit into the triangular wave function to respectively obtain a transmission delay difference value, and solving an average value of all the obtained transmission delay differences to obtain a transmission delay difference value of the final channel to be measured relative to the reference channel.
As a further improvement of the present invention, a first delay unit is arranged in front of each reference node, a second delay unit is arranged in front of each measurement node, and the first delay unit is different from the second delay unit.
As a further improvement of the present invention, the delays of the first delay unit and the second delay unit are the same, and the number of first delay units between adjacent reference nodes is equal to the number of second delay units between adjacent measurement nodes, and the signal transmission directions on the first measurement line and the second measurement line are opposite.
As a further improvement of the present invention, when the reference nodes are connected in series, the second delay units are connected in parallel with each other and the measurement node is arranged on the output end of the second delay unit; when the measurement nodes are connected in series, the first delay units are connected in parallel, and the reference node is arranged on the output end of the first delay unit.
As a further improvement of the present invention, the delays of the first delay unit and the second delay unit are the same, and the number of first delay units between adjacent reference nodes is different from the number of second delay units between adjacent measurement nodes.
As a further improvement of the present invention, the reference signal and the synchronous detection signal are square wave signals with a constant frequency.
As a further improvement of the present invention, the node phase measurement unit includes an exclusive or gate phase detector, a low-pass filtering module and a voltage measurement module, which are connected in sequence, and an input end of the exclusive or gate phase detector is connected to a reference node and a measurement node corresponding thereto, respectively.
As a further improvement of the present invention, the low-pass filtering module includes a resistor and a filtering capacitor, the resistor is connected in series between the output end of the xor gate phase discriminator and the voltage measuring module, and the filtering capacitor is connected between the resistor and the voltage measuring module and grounded.
As a further improvement of the present invention, the data processing module fits the corresponding dc voltage values according to a triangle wave according to the node number sequence, and obtains a triangle wave function as follows:
Figure 207967DEST_PATH_IMAGE001
wherein the content of the first and second substances,nis the node number;Vnis node number ofnThe direct current voltage value measuring result output by the corresponding node phase measuring unit;V MAX is the maximum value of the output voltage of the node phase measurement unit;V MIN is the minimum value of the output voltage of the node phase measurement unit;Tis the period of the reference signal;td L1 is the time difference of the reference signal passing through the neighboring reference nodes;td L2 is the time difference of the detection signal passing through the adjacent node; definition of
Figure 72018DEST_PATH_IMAGE002
Is X, function mod1(x) Dividing X by 1 to obtain the remainder, and obtaining the value of 0-1;
Δti.e. the phase difference between the reference signal and the detection signal at the start of the first measurement line and the start of the second measurement line, i.e. the difference in transmission delay of the channel to be measured with respect to the reference channel, is determined according toThe triangular wave function is used for measuring the direct current voltage value output by each node phase measuring unitVnSubstitution to give Δt。
As a further improvement of the invention, the triangular wave function is a periodic function, and the solution of delta is carried outtWhen, take ΔtA unique solution between-0.5T to +0.5T,
all the direct current voltage values are converted into direct current voltage valuesVnObtained DeltatAnd averaging the results to obtain the transmission delay difference value of the channel to be detected relative to the reference channel.
A method for measuring channel transmission delay difference is characterized in that: the method for measuring the transmission delay difference of the channel to be measured relative to the reference channel by adopting the channel transmission delay difference measuring system comprises the following steps:
s1: the reference signal and the synchronous detection signal are respectively input into a first measuring line and a second measuring line;
s2: the node phase measuring unit acquires signals of a corresponding reference node and a corresponding measuring node as a pair of input signals, and converts the signals into direct-current voltage values according to the phase difference between the pair of input signals;
s3: measuring and recording direct current voltage values output by all the node phase measuring units, and fitting the corresponding direct current voltage values according to a triangular wave according to the node number sequence to obtain a triangular wave function;
s4: and substituting the direct-current voltage value output by each node phase measurement unit into the triangular wave function respectively to obtain a transmission delay difference value, and calculating an average value of all the obtained transmission delay differences to obtain the transmission delay difference value of the channel to be measured relative to the reference channel finally.
The invention has the beneficial effects that: according to the invention, the synchronous signal obtains the phase difference signal on the first measurement line and the second measurement line, the node phase measurement unit obtains the node voltage measurement data with regular change, the triangular wave fitting evaluation is carried out on the measurement data, the accurate transmission delay difference of the channel to be measured relative to the reference channel is obtained, the absolute error offset existing in single-path measurement is reduced, and the accuracy is increased along with the increase of the number of the nodes.
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FIG. 1 is a schematic illustration of the measurement channel principle of the present invention;
FIG. 2 is a schematic diagram of a node measurement unit according to the present invention;
fig. 3 is a schematic diagram of the signal conversion process of the xor gate phase detector of the present invention;
FIG. 4 is a schematic diagram of the conversion of square wave signals to DC voltage according to the present invention;
FIG. 5 is a schematic diagram of the DC voltage value output by the phase measuring unit of the reference node according to the present invention;
FIG. 6 is a schematic diagram of a measurement module connection structure according to an embodiment of the present invention;
FIG. 7 is a graph showing the relationship between node number and measurement voltage according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of a connection structure of a second measurement module according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a connection structure of three measurement modules according to an embodiment of the present invention;
the reference numbers in the figures illustrate: 10. a first measurement line; 11. a reference node; 20. a second measurement line; 21. measuring a node; 30. a node measurement unit; 31. an exclusive-or gate phase discriminator; 32. a low-pass filtering module; 33. and a voltage measuring module.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Referring to fig. 1 to 6, an embodiment of the present invention provides a channel transmission delay difference measurement system, including:
a reference channel outputting a reference signal;
a plurality of channels to be tested, at least one channel to be tested exists at the current moment, and the channel to be tested outputs a detection signal synchronous with the reference signal;
a measurement module comprising a first measurement line 10, a second measurement line 20 and a plurality of node phase measurement units 30, wherein:
the first measurement line 10 is connected to the reference channel and provided with a plurality of reference nodes 11, the reference nodes 11 sequentially carry out node numbering according to the arrival sequence of reference signals, and the reference signals pass through the adjacent reference nodes 11 and have the same time difference;
the second measurement line 20 is connected to the current channel to be measured, the measurement nodes 21 corresponding to the reference nodes 11 one by one are arranged, the same time difference exists when the detection signal passes through the adjacent measurement nodes 21, and the time difference on the second measurement line 20 is different from that on the first measurement line 10;
each node phase measurement unit 30 is disposed between a set of corresponding reference nodes 11 and measurement nodes 21, acquires signals of the set of corresponding reference nodes 11 and measurement nodes 21 as a pair of input signals, and converts the signals into a direct-current voltage value according to a phase difference between the pair of input signals;
the data processing module is connected to the measuring module, measures and records the direct-current voltage values output by all the node phase measuring units 30, and fits the corresponding direct-current voltage values according to the node number sequence and the triangular wave to obtain a triangular wave function;
and the data analysis module substitutes the direct-current voltage value output by each node phase measurement unit 30 into the triangular wave function respectively to obtain a transmission delay difference value respectively, and calculates an average value of all the obtained transmission delay differences to obtain a transmission delay difference value of the final channel to be measured relative to the reference channel.
Specifically, the node phase measuring unit 30 of the present invention uses an exclusive or gate phase detector 31, and its operating principle is that two signals having a phase difference are input, and the output is a voltage signal. The characteristic of the xor gate phase detector 31 is that the output signal is high only when the input signal states are not identical. As shown in FIG. 1, the synchronous rising edge pulse signal is due to the inherent delay on the channelnWith different delay differences for each channeltd 1 ~td n In order to measure the delay difference of different channels more accurately, the xor gate phase discriminator 31 is connected to the first measurement line 10 and the second measurement line 20, so as to judge the phase difference, and as long as two channel signals go through different transmission delay lines, the two channel signals are obtained at a series of measurement nodes 21Different phase differences are obtained, regularly changing measurement data can be obtained, namely, certain change rules can be generated by the output pulse signals of different channels to be measured, which are connected to the second measurement line 20, through the output phase differences of the phase discriminators, results can be conveniently summarized, and therefore more accurate and actual delay difference values can be obtained.
Referring to fig. 2, the node phase measuring unit 30 is composed of an exclusive or gate phase detector 31, a low pass filter module 32, and a voltage measuring module 33, and generates a voltage square wave output signal according to a phase difference of input signals, and obtains a direct current voltage through a filter to measure, so as to obtain multipoint measurement data. Referring to fig. 3 and 4, for waveform conversion of single-channel measurement, first, the output voltage of the reference node 11 is set to be U1The output voltage of the corresponding measurement node 21 is U2Square wave voltage U generated by a single xor gate phase detector 310After passing through a low-pass filter with specified parameters, direct-current voltage parameters are generated, and an ADC instrument is used for measuring a direct-current voltage value V of a single node. Referring to fig. 5, after voltage values corresponding to all nodes of the measurement module are to be measured, a data point diagram is formed, wherein an abscissa represents transmission time (which can be converted into a phase) of a reference signal on the first measurement line 10 according to a node number, an ordinate represents a voltage value obtained by converting a multi-node phase difference of output pulse signals of the second measurement line 20 and the first measurement line 10 through a delay unit, and the data processing module fits corresponding direct current voltage values according to a node number sequence according to a triangular wave to obtain a triangular wave function as follows:
Figure 620811DEST_PATH_IMAGE001
wherein the content of the first and second substances,nis the number of the node to which the node is connected,Vnis node number ofnThe measurement result of the direct current voltage value output by the corresponding node phase measurement unit is a known quantity,V MAX is the maximum value of the output voltage of the node phase measuring unit, is a constant value in the measuring process,V MIN is the minimum value of the output voltage of the node phase measuring unit, is a constant value in the measuring process,Tis the period of the reference signal, is a constant during the measurement,td L1 is the time difference of the reference signal passing through the adjacent reference nodes, is a constant in the measurement process,td L2 is the time difference of the detection signal passing through the adjacent node, and is a constant, function mod, in the measurement process1(x) The remainder is obtained by dividing X by 1 to obtain a value, Delta, between 0 and 1tThat is, at the starting point of the first measurement line and the starting point of the second measurement line, the phase difference between the reference signal and the detection signal, that is, the transmission delay difference of the channel to be measured with respect to the reference channel. DeltatIs the only unknown in the above formula and can therefore be solved using the above formula. Since the function represented by the above formula is a triangular periodic function, solving for ΔtWill have the followingTAn infinite number of solutions to the cycle. According to the actual physical meaning, take DeltatUnique solutions between-0.5T to + 0.5T. Due to the voltage of each measuring cellVnCan solve for atAll of Δ will betThe results are averaged to obtain a more accurate measurement.
Further, measurenThe phase difference voltage change rule of each channel to be tested generates a corresponding fitting triangular wave function, and the delay time of each delay unit is set astThe signal clock period isTAnd then the phase unit is measured to be 2 pi T/T, and the transmission delay difference of each channel to be measured relative to the reference channel is obtained.
The embodiment of the invention also provides a channel transmission delay difference measuring method, which adopts the channel transmission delay difference measuring system to measure the transmission delay difference of a channel to be measured relative to a reference channel and comprises the following steps:
s1: the reference signal and the synchronous detection signal are respectively input into the first measuring line 10 and the second measuring line 20;
s2: the node phase measurement unit 30 acquires signals of the corresponding reference node 11 and measurement node 21 as a pair of input signals, and converts the signals into direct-current voltage values according to the phase difference between the pair of input signals;
s3: measuring and recording direct current voltage values output by all the node phase measuring units 30, and fitting the corresponding direct current voltage values according to a triangular wave according to the node number sequence to obtain a triangular wave function;
s4: and substituting the direct-current voltage value output by each node phase measurement unit 30 into the triangular wave function respectively to obtain a transmission delay difference value, and calculating an average value of all the obtained transmission delay differences to obtain the transmission delay difference value of the channel to be measured relative to the reference channel finally.
Further, the first measurement line 10 and the second measurement line 20 are both provided with a plurality of identical delay units, which are arranged between the reference nodes 11 and between the measurement nodes 21, the delays of all the delay units arranged on the first measurement line 10 are identical, and the delays of all the delay units arranged on the second measurement line 20 are identical, but the delays of the delay units on the first measurement line 10 are not identical to the delays of the delay units on the second measurement line 20, so that the measurement nodes 21 and the corresponding reference nodes 11 output signals with phase differences, so that the output voltage value of the xor gate phase discriminator 31 can generate a certain change rule, and the following embodiments are designed based on the principle.
The invention uses the node phase measurement unit 30 to reflect the phase difference of the transmission signals of different channels, so that the fitting evaluation is carried out by obtaining the multi-point phase difference through signal processing, compared with the single-point measurement, the precision is higher, the method is more practical, the result is more effective, and the more data, the better the fitting and the higher the precision.
Example one
Referring to fig. 7, an embodiment of the present invention provides a channel transmission delay difference measurement system, which includes a first measurement line 10, a second measurement line 20, and a node phase measurement unit 30, where a reference channel port is connected to the first measurement line 10 formed by connecting a plurality of identical delay units in series, and a channel to be measured is also connected to the second measurement line 20 formed by connecting a plurality of identical delay units in series, and the connection directions are opposite. Suppose that there is a first measurement line 10mA delay unit for passing the output pulse signal of the first measurement line 10 throughkA delay unit andthe output pulse signal of the second measuring line 20 passes throughm−kA delay cell as an input to the xor gate phase detector 31, whereink=0~m。
By adopting the access line of the embodiment, each delay unit of the reference line is set to be 0.1 pulse period, and access signals of the two measurement lines are opposite, so td existsL1=-tdL2The square wave signal period is T =1ns, the output voltage range of the node phase measurement unit 30 is 0V-1V, the number of nodes is 10, two channels to be measured are respectively measured, and the delay measurement data is shown in table 1:
Figure 912115DEST_PATH_IMAGE003
TABLE 1
When the phase difference is 0 or 2 pi and multiples thereof, the duty ratio of the square wave measured by the phase discriminator is 0%, and the voltage is expressed as the minimum value; when the phase difference is pi and its multiple, the duty ratio of the square wave measured by the phase discriminator is 100%, and the voltage is expressed as the maximum value. Taking the node numbers as abscissa in sequence, taking the corresponding voltage values as ordinate to obtain a relational graph shown in the figure 7, obtaining a triangular wave function through data fitting according to the measured voltage values and the corresponding node numbers, and substituting the voltage values into the fitted triangular wave function to obtain the final delay of the channel 1 to be measured as 0.2154 ns; the time delay of the channel 2 to be measured is 0.3665 ns.
Example two
Referring to fig. 8, an embodiment of the present invention provides a channel transmission delay difference measurement system, which includes a first measurement line 10, a second measurement line 20, and a node phase measurement unit 30, wherein a reference channel port is connected to the first measurement line 10 formed by connecting a plurality of identical delay units in series, and channels to be measured are respectively connected to parallel channels to be measuredmA second measurement line 20 of identical delay cells. Suppose that there is a first measurement line 10mA delay unit for passing the output pulse signal of the first measurement line 10 throughkThe delay units and the output pulse signal of the second measurement circuit 20 are used as the input of the phase discriminator through the single delay unit of each path in turn, whereink=0~m. The present embodiment may be applied by replacing the ports of the second measurement line 20 and the first measurement line 10.
EXAMPLE III
Referring to fig. 9, an embodiment of the present invention provides a channel transmission delay difference measurement system, which includes a first measurement line 10, a second measurement line 20, and a node phase measurement unit 30, and connects a reference channel port to the first measurement line 10 including a plurality of identical delay units connected in series, and connects a channel to be measured to the second measurement line 20 including a plurality of identical delay units connected in series, which are double times of the first measurement line 10. Suppose that there is a first measurement line 10mA delay unit for passing the output pulse signal of the first measurement line 10 throughkThe output pulse signals of the delay unit and the second measuring line 20 are passed through the 2 ndkA delay unit as input of the phase detector, whereink=0~m。
The above embodiments all aim to enable output pulse signals of different channels to be measured to generate a certain rule through the output phase difference of the node phase measurement unit 30, so as to conveniently summarize the result, thereby obtaining a more accurate and actual delay difference value.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims (11)

1. A channel transmission delay difference measurement system is characterized in that: the method comprises the following steps:
a reference channel outputting a reference signal;
a plurality of channels to be tested, at least one channel to be tested exists at the current moment, and the channel to be tested outputs a detection signal synchronous with the reference signal;
a measurement module comprising a first measurement line, a second measurement line, and a plurality of node phase measurement units, wherein:
the first measurement line is connected to the reference channel and provided with a plurality of reference nodes, the reference nodes sequentially carry out node numbering according to the arrival sequence of the reference signals, and the reference signals have the same time difference after passing through the adjacent reference nodes;
the second measurement line is connected to the current channel to be measured and is provided with measurement nodes in one-to-one correspondence with the reference nodes, the detection signals have the same time difference when passing through the adjacent measurement nodes, and the time difference on the second measurement line is different from that on the first measurement line;
each node phase measuring unit is arranged between a group of corresponding reference nodes and measuring nodes, obtains signals of the group of corresponding reference nodes and measuring nodes as a pair of input signals, and converts the signals into direct-current voltage values according to phase differences between the pair of input signals;
the data processing module is connected to the measuring module, measures and records the direct-current voltage values output by all the node phase measuring units, and fits the corresponding direct-current voltage values according to the node number sequence and the triangular wave to obtain a triangular wave function;
and the data analysis module is used for respectively substituting the direct-current voltage value output by each node phase measurement unit into the triangular wave function to respectively obtain a transmission delay difference value, and solving an average value of all the obtained transmission delay differences to obtain a transmission delay difference value of the final channel to be measured relative to the reference channel.
2. The system of claim 1, wherein the channel propagation delay difference measurement system comprises: and a first delay unit is arranged in front of each reference node, a second delay unit is arranged in front of each measurement node, and the first delay unit is different from the second delay unit.
3. The system of claim 2, wherein the channel propagation delay difference measurement system comprises: the time delay of the first time delay unit is the same as that of the second time delay unit, the number of the first time delay units between the adjacent reference nodes is equal to that of the second time delay units between the adjacent measurement nodes, and the signal transmission directions on the first measurement line and the second measurement line are opposite.
4. The system of claim 2, wherein the channel propagation delay difference measurement system comprises: when the reference nodes are connected in series, the second delay units are connected in parallel, and the output end of the second delay unit is provided with the measurement node; when the measurement nodes are connected in series, the first delay units are connected in parallel, and the reference node is arranged on the output end of the first delay unit.
5. The system of claim 2, wherein the channel propagation delay difference measurement system comprises: the time delay of the first time delay unit is the same as that of the second time delay unit, and the number of the first time delay units between the adjacent reference nodes is different from that of the second time delay units between the adjacent measurement nodes.
6. The system of claim 1, wherein the channel propagation delay difference measurement system comprises: the reference signal and the synchronous detection signal are square wave signals with certain frequency.
7. The system of claim 1, wherein the channel propagation delay difference measurement system comprises: the node phase measuring unit comprises an exclusive-OR gate phase discriminator, a low-pass filtering module and a voltage measuring module which are sequentially connected, and the input end of the exclusive-OR gate phase discriminator is respectively connected with a reference node and a measuring node corresponding to the reference node.
8. The system of claim 7, wherein the channel propagation delay difference measurement system comprises: the low-pass filtering module comprises a resistor and a filtering capacitor, the resistor is connected between the output end of the exclusive-OR gate phase discriminator and the voltage measuring module in series, and the filtering capacitor is connected between the resistor and the voltage measuring module and grounded.
9. The system of claim 1, wherein the channel propagation delay difference measurement system comprises: the data processing module fits the corresponding direct current voltage value according to the node number sequence and the triangular wave to obtain a triangular wave function as follows:
Figure 825436DEST_PATH_IMAGE001
wherein the content of the first and second substances,nis the node number;Vnis node number ofnThe direct current voltage value measuring result output by the corresponding node phase measuring unit;V MAX is the maximum value of the output voltage of the node phase measurement unit;V MIN is the minimum value of the output voltage of the node phase measurement unit;Tis the period of the reference signal;td L1 is the time difference of the reference signal passing through the neighboring reference nodes;td L2 is the time difference of the detection signal passing through the adjacent node; definition of
Figure 211418DEST_PATH_IMAGE002
Is X, function mod1(x) Dividing X by 1 to obtain the remainder, and obtaining the value of 0-1;
Δtthat is, at the starting point of the first measurement line and the starting point of the second measurement line, the phase difference between the reference signal and the detection signal, that is, the transmission delay difference of the channel to be measured relative to the reference channel, and the direct-current voltage value output by each node phase measurement unit is measured according to the triangular wave functionVnSubstitution to give Δt。
10. The system for measuring channel propagation delay difference of claim 9, wherein: the triangular wave function is a periodic function, and the solution of deltatWhen, take ΔtA unique solution between-0.5T to +0.5T,
all the direct current voltage values are converted into direct current voltage valuesVnObtained DeltatAnd averaging the results to obtain the transmission delay difference value of the channel to be detected relative to the reference channel.
11. A method for measuring channel transmission delay difference is characterized in that: a channel transmission delay difference measurement system as claimed in any one of claims 1 to 10, for measuring the transmission delay difference of a channel to be measured with respect to a reference channel, comprising the steps of:
s1: the reference signal and the synchronous detection signal are respectively input into a first measuring line and a second measuring line;
s2: the node phase measuring unit acquires signals of a corresponding reference node and a corresponding measuring node as a pair of input signals, and converts the signals into direct-current voltage values according to the phase difference between the pair of input signals;
s3: measuring and recording direct current voltage values output by all the node phase measuring units, and fitting the corresponding direct current voltage values according to a triangular wave according to the node number sequence to obtain a triangular wave function;
s4: and substituting the direct-current voltage value output by each node phase measurement unit into the triangular wave function respectively to obtain a transmission delay difference value, and calculating an average value of all the obtained transmission delay differences to obtain the transmission delay difference value of the channel to be measured relative to the reference channel finally.
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