CN116318155B - Precise time base equivalent sampling device and method - Google Patents
Precise time base equivalent sampling device and method Download PDFInfo
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- CN116318155B CN116318155B CN202310570032.4A CN202310570032A CN116318155B CN 116318155 B CN116318155 B CN 116318155B CN 202310570032 A CN202310570032 A CN 202310570032A CN 116318155 B CN116318155 B CN 116318155B
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- 238000005070 sampling Methods 0.000 title claims abstract description 228
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 81
- 239000000872 buffer Substances 0.000 claims abstract description 54
- 238000006243 chemical reaction Methods 0.000 claims abstract description 50
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000819 phase cycle Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000035929 gnawing Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
- H03M1/1255—Synchronisation of the sampling frequency or phase to the input frequency or phase
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The invention provides a precise time base equivalent sampling device and a method, wherein the device comprises a sampling module, a clock buffer module, an analog-to-digital conversion circuit, a time base generation module and a main control module; the sampling module is respectively connected with the clock buffer module, the analog-to-digital conversion circuit and the time base generation module, the main control module is respectively connected with the clock buffer module, the analog-to-digital conversion circuit and the time base generation module, and the clock buffer module is connected with the analog-to-digital conversion circuit. According to the invention, the external trigger signal is acquired, the frequency value is obtained by measuring the frequency of the signal according to the preset frequency calculation program, then the precise sampling clock frequency is generated based on the frequency value, the external trigger signal and the optical signal to be detected are synchronously sampled by adopting the clock frequency, and the eye pattern reconstruction is carried out according to the sampling data and the time sequence of the external trigger signal, so that a more precise clock source is obtained, and the eye pattern reconstructed based on the sampling data obtained by sampling the precise clock source is more precise.
Description
Technical Field
The invention relates to the technical field of data acquisition, in particular to a precise time base equivalent sampling device and method.
Background
Along with the rapid development of digital technology, the acquisition of high-frequency signals is gradually increased, and the digital storage oscilloscope is one of main instruments for testing and analyzing signals and has wide application in various industries such as information communication, high-energy physics, unexpected electronics and the like.
The main working principle of the digital storage oscilloscope is that the signal conditioning circuit regulates an input signal into the optimal input range of the analog-to-digital converter, collects and quantifies the analog input signal, the field programmable gate array controls the memory to access data according to the triggering condition, and the digital storage oscilloscope has very limited signal bandwidth capable of being observed in a real-time sampling mode due to the limitation of the received sampling rate and the Nyquist sampling theorem, and usually needs to adopt an equivalent sampling technology to observe a high-frequency periodic signal. The accuracy of the reconstructed eye diagram of the digital storage oscilloscope depends on the accuracy of the sampled data, and the accuracy of the clock reference source determines the accuracy of the sampled data, so how to design a precise clock reference source to collect the optical signal and construct a precise eye diagram is a technical problem to be solved.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a precise time-base equivalent sampling device and method for solving the technical problem of inaccurate eye diagram caused by inaccurate clock reference source.
In order to solve the above problems, the present invention provides a precision time base equivalent sampling device, including: the device comprises a sampling module, a clock buffer module, an analog-to-digital conversion circuit, a time base generation module and a main control module;
the sampling module is respectively connected with the clock buffer module, the analog-to-digital conversion circuit and the time base generation module, the main control module is respectively connected with the clock buffer module, the analog-to-digital conversion circuit and the time base generation module, and the clock buffer module is connected with the analog-to-digital conversion circuit;
the sampling module is used for collecting an external trigger signal to obtain an initial trigger analog electric signal, and sending the initial trigger analog electric signal to the main control module after passing through the clock buffer module;
the main control module is used for calculating the initial trigger analog electric signal based on a preset frequency calculation program to obtain an external trigger frequency;
the main control module is also used for controlling the time base generating module to generate sampling clock frequency according to the external trigger frequency;
the time base generating module is used for outputting the sampling clock frequency to the adoption module and the clock buffer module;
the sampling module is used for collecting an optical signal to be detected and an external trigger signal which are input from the outside according to the sampling clock frequency to obtain an optical analog electric signal and a trigger sampling analog electric signal, and outputting the optical analog electric signal and the trigger sampling analog electric signal to the analog-to-digital conversion circuit;
the analog-to-digital conversion circuit is used for converting the optical analog electric signal and the triggering sampling analog electric signal into optical digital electric signals and triggering sampling digital electric signals and outputting the optical digital electric signals and the triggering sampling analog electric signals to the main control module;
the main control module is used for reconstructing an eye pattern of the optical signal to be detected according to the optical digital electric signal and the triggering sampling digital electric signal.
Optionally, the sampling module includes: a photoelectric converter, a first sample holder, and a second sample holder;
the first sampling holder is respectively connected with the analog-to-digital conversion circuit, the photoelectric converter and the clock buffer module, and the second sampling holder is respectively connected with the time base generation module and the clock buffer module;
the photoelectric converter is used for converting the optical signal to be detected into an electrical signal to be detected and outputting the electrical signal to be detected to the first sampling holder;
the first sampling holder is used for collecting the electric signal to be detected, obtaining an optical analog electric signal, and outputting the optical analog electric signal to the analog-to-digital conversion circuit;
the second sampling holder is configured to acquire the external trigger signal according to the sampling clock frequency, obtain a trigger sampling analog electrical signal, and output the trigger sampling analog electrical signal to the analog-to-digital conversion circuit;
the second sampling holder is further configured to collect the external trigger signal, obtain an initial trigger analog electrical signal, and send the initial trigger analog electrical signal to the main control module after passing through the clock buffer module.
Optionally, the clock buffer module includes: a first clock buffer and a second clock buffer;
the first clock buffer is respectively connected with the second sampling holder, the analog-to-digital conversion circuit and the main control module, and the second clock buffer is respectively connected with the time base generation module, the analog-to-digital conversion circuit and the first sampling holder;
the first clock buffer is configured to convert one path of the trigger sampling analog electrical signal output by the second sample holder into two paths of trigger sampling analog electrical signals, and output the two paths of trigger sampling analog electrical signals to the main control module and the analog-to-digital conversion circuit respectively;
the second clock buffer is configured to convert one path of clock sampling frequency output by the time base generating module into two paths of clock sampling frequencies, and output the two paths of clock sampling frequencies to the analog-to-digital conversion circuit and the first sampling holder respectively.
Optionally, the precise time base equivalent sampling device further comprises a frequency divider;
the frequency divider is respectively connected with the second sampling holder and the main control module;
the frequency divider is configured to divide the frequency of the external trigger signal input from the outside according to the frequency division instruction transmitted by the main control module, and output the divided frequency to the second sample holder.
Optionally, the main control module adopts a field programmable gate array.
Optionally, the time base generating module adopts a programmable clock.
The invention also provides a precision time base equivalent sampling method which is applied to the precision time base equivalent sampling device in any one of the above gnawing modes, and the precision time base equivalent sampling method comprises the following steps:
the sampling module is used for collecting an external trigger signal to obtain an initial trigger analog electric signal;
calculating an initial trigger analog electric signal based on a main control module to obtain an external trigger frequency;
controlling a time base generating module to generate sampling clock frequency according to the external trigger frequency;
acquiring an optical signal to be detected and an external trigger signal which are input from the outside according to the sampling clock frequency based on the sampling module to obtain an optical analog electric signal and a trigger sampling analog electric signal;
converting the optical analog electrical signal and the trigger sampling analog electrical signal into an optical digital electrical signal and a trigger sampling digital electrical signal by adopting an analog-to-digital conversion circuit;
and reconstructing an eye pattern of the optical signal to be detected according to the optical digital electric signal and the triggering sampling digital electric signal.
Optionally, the step of acquiring the optical analog electrical signal and triggering the sampling analog electrical signal based on the sampling module to acquire the optical signal to be detected and the external triggering signal input from the outside according to the sampling clock frequency includes:
converting the externally input optical signal to be tested into an electric signal to be tested by adopting a photoelectric converter;
acquiring the electric signal to be detected based on a first sampling holder to obtain an optical analog electric signal;
and acquiring an external trigger signal input from the outside based on the second sampling holder according to the sampling clock frequency to obtain a trigger sampling analog electric signal.
Optionally, before the step of acquiring the initial trigger analog electrical signal by adopting the sampling module to acquire the external trigger signal, the method further includes:
and dividing the frequency of the external trigger signal input externally based on a frequency divider.
Optionally, the step of controlling the time base generating module to generate the sampling clock frequency according to the external trigger frequency further includes:
and synchronously updating the sampling clock frequency according to the external trigger frequency obtained by real-time monitoring.
The beneficial effects of adopting the embodiment are as follows: the accurate time base equivalent sampling device provided by the invention collects an external trigger signal through the sampling module, converts the collected signal and transmits the signal to the main control module, so that the main control module calculates according to a preset frequency calculation program to obtain an external trigger frequency, then generates a sampling clock frequency based on the external trigger frequency, simultaneously samples the external trigger signal and an optical signal to be detected by adopting the clock frequency, converts an analog electric signal obtained by sampling into a digital electric signal by adopting the analog-to-digital conversion circuit and then inputs the digital electric signal into the main control module, so that the main control module reconstructs an eye pattern of the optical signal to be detected according to the digital electric signal, thereby obtaining a more accurate clock source, and reconstructing the eye pattern based on sampling data obtained by sampling of the accurate clock source.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a precision time-base equivalent sampling device provided by the present invention;
FIG. 2 is a flow chart of one embodiment of the precise time-based equivalent sampling method provided by the present invention;
fig. 3 is a flowchart illustrating an embodiment of step S250 in fig. 2 according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present invention. It should be appreciated that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The embodiment of the invention provides a precise time base equivalent sampling device and a method, which are respectively described below.
Fig. 1 is a schematic structural diagram of an embodiment of a precision time base equivalent sampling device provided by the present invention, as shown in fig. 1, including: the device comprises a sampling module 110, a clock buffer module 120, an analog-to-digital conversion circuit 130, a time base generation module 140 and a main control module 150;
the sampling module 110 is respectively connected with the clock buffer module 120, the analog-to-digital conversion circuit 130 and the time base generation module 140, the main control module 150 is respectively connected with the clock buffer module 120, the analog-to-digital conversion circuit 130 and the time base generation module 140, and the clock buffer module 120 is connected with the analog-to-digital conversion circuit 130;
the sampling module 110 is configured to collect an external trigger signal to obtain an initial trigger analog electrical signal, and send the initial trigger analog electrical signal to the main control module 150 after passing through the clock buffer module 120;
the main control module 150 is configured to calculate an initial trigger analog electrical signal based on a preset frequency calculation program, so as to obtain an external trigger frequency;
the main control module 150 is further configured to control the time base generating module 140 to generate a sampling clock frequency according to the external trigger frequency;
a time base generating module 140 for outputting the sampling clock frequency to the adoption module 110 and the clock buffering module 120;
the sampling module 110 is configured to collect an optical signal to be detected and an external trigger signal, which are input from the outside, according to a sampling clock frequency, obtain an optical analog electrical signal and a trigger sampling analog electrical signal, and output the optical analog electrical signal and the trigger sampling analog electrical signal to the analog-to-digital conversion circuit 130;
the analog-to-digital conversion circuit 130 is configured to convert the optical analog electrical signal and the trigger sampling analog electrical signal into optical digital electrical signal and trigger sampling digital electrical signal, and output the optical digital electrical signal and the trigger sampling analog electrical signal to the main control module 150;
the main control module 150 is configured to reconstruct an eye pattern of the optical signal to be measured according to the optical digital electrical signal and the trigger sampling digital electrical signal.
Compared with the prior art, the precise time base equivalent sampling device provided by the embodiment of the invention collects an external trigger signal through the sampling module, converts the collected signal and transmits the signal to the main control module, so that the main control module calculates according to a preset frequency calculation program to obtain an external trigger frequency, then generates a sampling clock frequency based on the external trigger frequency, samples the external trigger signal and an optical signal to be tested, converts the sampled analog electric signal into a digital electric signal by adopting the analog-to-digital conversion circuit and then inputs the digital electric signal into the main control module, so that the main control module reconstructs an eye pattern of the optical signal to be tested according to the digital electric signal, not only obtains a more precise clock source, but also reconstructs the eye pattern based on sampling data obtained by sampling of the precise clock source.
In some embodiments of the invention, the sampling module comprises: a photoelectric converter 113, a first sample holder 111, and a second sample holder 112;
the first sample holder 111 is connected to the analog-to-digital conversion circuit 130, the photoelectric converter 113 and the clock buffer module 120, and the second sample holder 112 is connected to the time base generating module 140 and the clock buffer module 120;
a photoelectric converter 113, configured to convert the optical signal to be measured into an electrical signal to be measured and output the electrical signal to the first sample holder 111;
the first sample holder 111 is configured to collect an electrical signal to be measured, obtain an optical analog electrical signal, and output the optical analog electrical signal to the analog-to-digital conversion circuit 130;
the second sample holder 112 is configured to acquire the external trigger signal according to the sampling clock frequency, obtain a trigger sampling analog electrical signal, and output the trigger sampling analog electrical signal to the analog-to-digital conversion circuit 130;
the second sample holder 112 is further configured to collect an external trigger signal, obtain an initial trigger analog electrical signal, and send the initial trigger analog electrical signal to the main control module 150 after passing through the clock buffer module.
It may be understood that, in the embodiment of the present invention, the external trigger signal is output to the main control module 150 after passing through the second sample holder 112 and the clock buffer module 120, the main control module 150 performs measurement calculation on the input external trigger signal through a preset algorithm to obtain an external trigger frequency, a target clock sampling frequency value is obtained by calculation of an internal program, the time base generating module 140 is controlled to generate a clock sampling frequency identical to the target clock sampling frequency value, the sampling clock frequency is output to the first sample holder 111 and the second sample holder 112 through the clock buffer module 120 respectively, so as to synchronously sample the optical signal to be measured and the external trigger signal, the analog quantity data obtained by sampling is converted into digital quantity data through the analog-to-digital conversion circuit 130, and then is output to the main control module 150, and the program in the main control module 150 rearranges the optical sampling digital quantity data according to the phase of the external trigger signal and the acquired discrete digital quantity data to obtain the original data of the optical signal to be measured, thereby performing eye diagram reconstruction.
Since the first sample holder 111 can only collect the electrical signal, the photoelectric converter 113 is required to convert the input optical signal to be measured into the electrical signal to be measured, and then the electrical signal to be measured is collected by the first sample holder 111.
It should be understood that, in the embodiment of the present invention, the master control module 150 may be an FPGA (Field-Programmable Gate Array, field programmable gate array) and the time base generating module 140 may be a programmable clock, when the measured external trigger frequency is f1, the target sampling clock frequency may be set to f1+f0, the value of f0 is very small, and generally f1/n, n may be any value, and the equivalent sampling period is ((1/f 1) - (1/(f1+f0))), and meanwhile, the higher the measurement precision for f1, the more accurate the sampling clock frequency outputted by the programmable clock.
For example, when the external trigger clock frequency f1 is measured to be 250MHz (preferably accurate to MHz), f0 may be made to be 4kHz, then the equivalent sampling period is ((1/250 MHz) - (1/(250mhz+4khz))) 10 x 15=64 femto seconds, the equivalent sampling frequency is about 15.62THz, if the equivalent sampling frequency is used to sample a 10.3125G signal, about 1515 points may be sampled for a single period of the signal, and up to 12498 points may be acquired for a single period of the 1.25G signal, the equivalent sampling frequency is greatly increased, and the number of sampling points for a single period becomes more, so that the restored eye pattern becomes more accurate.
In some embodiments of the invention, the clock buffer module comprises: a first clock buffer 121 and a second clock buffer 122;
the first clock buffer 121 is connected to the second sample holder 112, the analog-to-digital conversion circuit 130, and the master control module 150, and the second clock buffer 122 is connected to the time base generating module 140, the analog-to-digital conversion circuit 130, and the first sample holder 111, respectively;
the first clock buffer 121 is configured to convert one path of trigger sampling analog electrical signals output by the second sample holder into two paths of trigger sampling analog electrical signals, and output the two paths of trigger sampling analog electrical signals to the main control module 150 and the analog-to-digital conversion circuit 130 respectively;
the second clock buffer 122 is configured to convert one clock sampling frequency outputted by the time base generating module 140 into two clock sampling frequencies, and output the two clock sampling frequencies to the analog-to-digital converting circuit 130 and the first sampling keeper 111 respectively.
It can be understood that, in the embodiment of the present invention, the first clock buffer 121 is used for converting the signal collected by the second sample holder into two paths, one path is directly output to the main control module 150, the other path is output to the analog-to-digital conversion circuit 130, and the second clock buffer 122 is used for converting the input clock sampling frequency signal into two paths and then outputting the two paths, which are all input buffers.
In some embodiments of the present invention, the precise time base equivalent sampling device further includes a frequency divider;
the frequency divider 160 is connected with the second sample holder 112 and the main control module 150 respectively;
the frequency divider 160 is configured to divide the frequency of the external trigger signal input from the outside according to the frequency division instruction transmitted by the main control module 150, and output the divided frequency to the second sample holder 112.
It should be understood that, in the embodiment of the present invention, when the frequency of the external trigger signal is too high, the main control module 150 (field programmable gate array) may calculate the required frequency of the external trigger signal according to a preset internal program, and then drive the frequency divider to work through the control signal, and output the frequency-reduced external trigger signal to the second sample holder 112.
On the other hand, based on the precise time base equivalent sampling device, correspondingly, the embodiment of the invention also provides a precise time base equivalent sampling method which is applicable to the precise time base equivalent sampling device described in any one of the embodiments; as shown in fig. 2, the precise time base equivalent sampling method includes the following steps:
s210, acquiring an external trigger signal by adopting a sampling module to obtain an initial trigger analog electric signal;
s220, calculating an initial trigger analog electric signal based on a main control module to obtain an external trigger frequency;
s230, controlling a time base generating module to generate sampling clock frequency according to the external trigger frequency;
s240, acquiring an optical signal to be detected and an external trigger signal which are input from the outside based on a sampling module according to the sampling clock frequency to obtain an optical analog electric signal and a trigger sampling analog electric signal;
s250, an analog-to-digital conversion circuit is adopted to convert the optical analog electric signal and the trigger sampling analog electric signal into an optical digital electric signal and a trigger sampling digital electric signal;
s260, reconstructing an eye pattern of the optical signal to be detected according to the optical digital electric signal and the triggering sampling digital electric signal.
Compared with the prior art, the embodiment of the invention adopts the sampling module to collect the external trigger signal to obtain the initial trigger analog electric signal; calculating an initial trigger analog electric signal based on a main control module to obtain an external trigger frequency; controlling a time base generating module to generate sampling clock frequency according to the external trigger frequency; acquiring an optical signal to be detected and an external trigger signal which are input from the outside based on a sampling module according to the sampling clock frequency to obtain an optical analog electric signal and a trigger sampling analog electric signal; an analog-to-digital conversion circuit is adopted to convert the optical analog electric signal and the triggering sampling analog electric signal into an optical digital electric signal and a triggering sampling digital electric signal; and reconstructing an eye pattern of the optical signal to be detected according to the optical digital electric signal and the triggering sampling digital electric signal. According to the invention, the time base generation module is matched with the main control module to obtain the sampling clock frequency with an extremely small equivalent sampling period, and the sampling clock frequency is adopted to sample the external trigger signal and the optical signal to be detected, so that more points can be acquired in a single period of the optical signal to be detected, and the acquired optical sampling discrete signals can be arranged in phase sequence according to the time sequence of the external trigger signal, thereby obtaining a finer eye pattern.
In some embodiments of the present invention, as shown in fig. 3, step S250 includes:
s310, converting an externally input optical signal to be detected into an electrical signal to be detected by adopting a photoelectric converter;
s320, acquiring an electric signal to be detected based on the first sampling holder to obtain an optical analog electric signal;
s330, based on the second sampling holder, the external trigger signal input from the outside is acquired according to the sampling clock frequency, and the trigger sampling analog electric signal is obtained.
It should be noted that, the sampling frequencies of the first sampling keeper and the second sampling keeper are the same and are performed synchronously, so that the subsequent programmable gate array rearranges the phase sequence of the optical signal through the time sequence of the external trigger signal to obtain the eye pattern data and reconstruct the eye pattern.
In some embodiments of the present invention, before step S210, the method further includes:
the frequency of the externally input external trigger signal is divided based on the frequency divider.
It can be understood that in the embodiment of the present invention, when the frequency of the external trigger signal is too high, the main control module (field programmable gate array) may calculate the required frequency of the external trigger signal according to a preset internal program, and then drive the frequency divider to work through the control signal, and output the frequency-reduced external trigger signal to the second sample holder.
In some embodiments of the present invention, after step S240, the method further includes:
and synchronously updating the sampling clock frequency according to the external trigger frequency obtained by real-time monitoring.
It can be appreciated that in the embodiment of the present invention, the FPGA may synchronously control the sampling clock frequency of the programmable clock output according to the external trigger signal measured in real time, so that the equivalent sampling period is always maintained unchanged.
It should be noted that: the steps in the method in the foregoing embodiments may be added or extended according to each module or unit in the precise time base equivalent sampling device, which is specifically described in the precise time base equivalent sampling device embodiment, and will not be described herein.
The precise time base equivalent sampling device and method provided by the invention are described in detail, and specific examples are applied to illustrate the principle and implementation of the invention, and the description of the above examples is only used for helping to understand the method and core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A precision time base equivalent sampling device, characterized in that it comprises: the device comprises a sampling module, a clock buffer module, an analog-to-digital conversion circuit, a time base generation module and a main control module;
the sampling module is respectively connected with the clock buffer module, the analog-to-digital conversion circuit and the time base generation module, the main control module is respectively connected with the clock buffer module, the analog-to-digital conversion circuit and the time base generation module, and the clock buffer module is respectively connected with the analog-to-digital conversion circuit and the time base generation module;
the sampling module is used for collecting an external trigger signal to obtain an initial trigger analog electric signal, and sending the initial trigger analog electric signal to the main control module after passing through the clock buffer module;
the main control module is used for calculating the initial trigger analog electric signal based on a preset frequency calculation program to obtain an external trigger frequency;
the main control module is also used for controlling the time base generating module to generate sampling clock frequency according to the external trigger frequency;
the time base generating module is used for outputting the sampling clock frequency to the sampling module and the clock buffering module;
the sampling module is used for collecting an optical signal to be detected and an external trigger signal which are input from the outside according to the sampling clock frequency to obtain an optical analog electric signal and a trigger sampling analog electric signal, and outputting the optical analog electric signal and the trigger sampling analog electric signal to the analog-to-digital conversion circuit;
the analog-to-digital conversion circuit is used for converting the optical analog electric signal and the triggering sampling analog electric signal into optical digital electric signals and triggering sampling digital electric signals and outputting the optical digital electric signals and the triggering sampling analog electric signals to the main control module;
the main control module is used for reconstructing an eye pattern of the optical signal to be detected according to the optical digital electric signal and the trigger sampling digital electric signal;
the sampling clock frequency is equal to the external trigger frequency plus a preset frequency value, and the preset frequency value is far smaller than the external trigger frequency.
2. The precision time-base equivalent sampling device of claim 1, wherein the sampling module comprises: a photoelectric converter, a first sample holder, and a second sample holder;
the first sampling holder is respectively connected with the analog-to-digital conversion circuit, the photoelectric converter and the clock buffer module, and the second sampling holder is respectively connected with the time base generation module and the clock buffer module;
the photoelectric converter is used for converting the optical signal to be detected into an electrical signal to be detected and outputting the electrical signal to be detected to the first sampling holder;
the first sampling holder is used for collecting the electric signal to be detected, obtaining an optical analog electric signal, and outputting the optical analog electric signal to the analog-to-digital conversion circuit;
the second sampling holder is configured to acquire the external trigger signal according to the sampling clock frequency, obtain a trigger sampling analog electrical signal, and output the trigger sampling analog electrical signal to the analog-to-digital conversion circuit;
the second sampling holder is further configured to collect the external trigger signal, obtain an initial trigger analog electrical signal, and send the initial trigger analog electrical signal to the main control module after passing through the clock buffer module.
3. The precision time-base equivalent sampling device of claim 2, wherein the clock buffering module comprises: a first clock buffer and a second clock buffer;
the first clock buffer is respectively connected with the second sampling holder, the analog-to-digital conversion circuit and the main control module, and the second clock buffer is respectively connected with the time base generation module, the analog-to-digital conversion circuit and the first sampling holder;
the first clock buffer is configured to convert one path of the trigger sampling analog electrical signal output by the second sample holder into two paths of trigger sampling analog electrical signals, and output the two paths of trigger sampling analog electrical signals to the main control module and the analog-to-digital conversion circuit respectively;
the second clock buffer is configured to convert one path of the sampling clock output by the time base generating module into two paths of sampling clock frequencies, and output the two paths of sampling clock frequencies to the analog-to-digital conversion circuit and the first sampling holder respectively.
4. The precision time base equivalent sampling device of claim 3, further comprising a frequency divider;
the frequency divider is respectively connected with the second sampling holder and the main control module;
the frequency divider is configured to divide the frequency of the external trigger signal input from the outside according to the frequency division instruction transmitted by the main control module, and output the divided frequency to the second sample holder.
5. The precise time-base equivalent sampling device according to claim 4, wherein the main control module adopts a field programmable gate array.
6. The precise time-base equivalent sampling device of claim 5, wherein the time-base generation module employs a programmable clock.
7. A precision time base equivalent sampling method applied to the precision time base equivalent sampling device according to any one of claims 1 to 6, characterized in that the precision time base equivalent sampling method comprises the following steps:
the sampling module is used for collecting an external trigger signal to obtain an initial trigger analog electric signal;
calculating an initial trigger analog electric signal based on a main control module to obtain an external trigger frequency;
controlling a time base generating module to generate sampling clock frequency according to the external trigger frequency;
acquiring an optical signal to be detected and an external trigger signal which are input from the outside according to the sampling clock frequency based on the sampling module to obtain an optical analog electric signal and a trigger sampling analog electric signal;
converting the optical analog electrical signal and the trigger sampling analog electrical signal into an optical digital electrical signal and a trigger sampling digital electrical signal by adopting an analog-to-digital conversion circuit;
and reconstructing an eye pattern of the optical signal to be detected according to the optical digital electric signal and the triggering sampling digital electric signal.
8. The precise time-based equivalent sampling method according to claim 7, wherein the step of acquiring the optical analog electrical signal and the trigger sampling analog electrical signal based on the sampling module according to the sampling clock frequency by collecting the externally input optical signal to be detected and the external trigger signal comprises:
converting the externally input optical signal to be tested into an electric signal to be tested by adopting a photoelectric converter;
acquiring the electric signal to be detected based on a first sampling holder to obtain an optical analog electric signal;
and acquiring an external trigger signal input from the outside based on the second sampling holder according to the sampling clock frequency to obtain a trigger sampling analog electric signal.
9. The precise time-based equivalent sampling method according to claim 8, wherein before the step of acquiring the initial trigger analog electrical signal by using the sampling module to acquire the external trigger signal, the method further comprises:
and dividing the frequency of the external trigger signal input externally based on a frequency divider.
10. The precise time-based equivalent sampling method according to any one of claims 9, wherein said step of controlling a time-based generation module to generate a sampling clock frequency according to said external trigger frequency further comprises:
and synchronously updating the sampling clock frequency according to the external trigger frequency obtained by real-time monitoring.
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