CN113376428A - Repetitive pulse and high-speed repetitive pulse amplitude detection method - Google Patents
Repetitive pulse and high-speed repetitive pulse amplitude detection method Download PDFInfo
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Abstract
The invention discloses a repetitive pulse and high-speed repetitive pulse amplitude detection method, which comprises the steps of continuously acquiring repetitive pulse signals to one input end of a voltage comparator, connecting the other input end of the voltage comparator with one output end of a control circuit, outputting scanning voltage signals with adjustable amplitude values by the output end, fixing the amplitude values of the scanning voltage signals in a detection period, acquiring two scanning voltage amplitude values corresponding to the pulse output signals and the non-generated pulse output signals generated by the output end of the voltage comparator in two adjacent detection periods, and calculating the two scanning voltage amplitude values to obtain the amplitude values of the pulse signals. The invention realizes simple, convenient and accurate measurement of repetitive pulses by connecting the scanning voltage signal with adjustable amplitude to one input end of the comparator for measurement.
Description
Technical Field
The invention relates to the technical field of test systems, in particular to a repetitive pulse and a high-speed repetitive pulse amplitude detection method.
Background
The measurement of the pulse waveform is an important measurement requirement in the field of communication measurement, and has great economic significance for the test of digital communication equipment and equipment in the field of electronic computers. The pulse parameters describe the waveform and time domain characteristics of the pulse, and the estimation of the pulse parameters is the main content of the time domain measurement. The pulse parameters mainly include pulse amplitude, pulse width, rise time, overshoot and the like, wherein the pulse amplitude is one of the most basic parameter indexes in pulse signal measurement, and along with the development of electronic technology, the requirement on the estimation precision of the pulse amplitude is higher and higher, most of the existing pulse measurements adopt an ADC (analog-to-digital converter) or a high-speed ADC (analog-to-digital converter) to analyze the pulse amplitude, firstly, the cost is expensive, the calculation amount is large, and the existing high-speed ADC cannot realize accurate sampling and accurate measurement for some high-speed pulses.
In addition, in some practical situations, repeated pulses can be generated continuously and the amplitude of the pulses is the same. For example, in an Optical Time Domain Reflectometer (OTDR) or in the case of measuring the loss of a remote optical device, several properties of the optical fiber, such as uniformity, defects, breakage, coupling at a joint, etc., are known by analyzing a measurement curve, which is manufactured according to the principle of back scattering of light and fresnel reverse, and the information of attenuation is obtained by using the back scattering light generated when the light propagates in the optical fiber, which can be used for measuring the attenuation of the optical fiber, the loss at the joint, the location of a fault point of the optical fiber, and the loss distribution of the optical fiber along the length, etc., in which case repeated measurements are performed. For another example, when measuring the loss of the remote optical device, the amplitude of the reflected pulse is received and measured, and repeated measurements are also needed. However, the existing pulse amplitude measuring method does not provide a simpler and more accurate measuring method for the situation that repeated pulses can be generated.
Disclosure of Invention
The invention aims to provide a repetitive pulse and a high-speed repetitive pulse amplitude detection method, which can realize simple, convenient and accurate measurement of the repetitive pulse by accessing a scanning voltage signal with adjustable amplitude at one input end of a comparator for measurement.
In order to achieve the purpose, the invention provides the following technical scheme: a repetitive pulse amplitude detection method comprises the steps of continuously acquiring a repetitive pulse signal to one input end of a voltage comparator, connecting the other input end of the voltage comparator with the first output end of a control circuit, outputting a scanning voltage signal with adjustable amplitude, and fixing the amplitude of the scanning voltage signal in a detection period.
Preferably, the detecting method includes inputting a scanning voltage signal with an amplitude of an initial set amplitude to an input terminal of the voltage comparator, and if the output terminal of the voltage comparator does not detect an output pulse signal within a detection period, reducing the scanning voltage signal on the basis of the initial set amplitude until the output pulse signal is detected by the output terminal of the voltage comparator for the first time under the scanning voltage signal with a certain amplitude, and recording the amplitude of the scanning voltage signal corresponding to the detected pulse signal for the first time as the amplitude of the pulse signal.
Preferably, the detecting method includes inputting a scanning voltage signal with an initial value of zero to an input end of the voltage comparator, gradually increasing the amplitude of the scanning voltage signal until, under the scanning voltage signal with a certain amplitude, the output end of the voltage comparator does not detect the output pulse signal for the first time in a detection period, and recording the amplitude of the scanning voltage signal corresponding to the pulse signal which is not detected for the first time as the amplitude value of the pulse signal.
Preferably, the repetition frequency of the pulse signal is greater than the period of the scanning voltage signal, the minimum value of the scanning voltage signal is smaller than the amplitude value of the pulse signal, and the maximum value of the scanning voltage signal is greater than the amplitude value of the pulse signal.
Preferably, the control circuit comprises a control chip and a D/a conversion circuit connected with the output end of the control chip, the output end of the D/a conversion circuit is connected with the first output end, and the output end of the voltage comparator is connected with a digital quantity input end of the FPGA chip.
Preferably, the detection method includes acquiring two scanning voltage amplitudes corresponding to the output end of the voltage comparator respectively generating the pulse output signal and not generating the pulse output signal in two adjacent detection periods, and taking an average value of the two scanning voltages as an amplitude value of the pulse signal.
Preferably, the detection method is further configured with an iteration strategy, and the iteration strategy includes inputting an average value of the two scanning voltages as a reference scanning voltage to one end of the voltage comparator to re-detect whether the voltage comparator generates a pulse signal in a detection period, dividing an iteration area according to a detection result, re-selecting the reference scanning voltage in the iteration area and performing loop detection until an iteration condition is met, and terminating the iteration.
Preferably, dividing the iteration region according to the detection result includes acquiring two scan voltage amplitudes corresponding to the output end of the voltage comparator respectively generating the pulse output signal and not generating the pulse output signal in two adjacent detection periods, and setting the regions corresponding to the two scan voltage amplitudes as the iteration regions.
Preferably, the iteration condition includes a preset first threshold, and the iteration condition is configured to be when a difference between two scan voltage amplitudes corresponding to a last measured iteration region is less than or equal to the first threshold.
The scanning voltage signal with adjustable amplitude is connected to one input end of the comparator for measurement, the control circuit continuously adjusts the amplitude of the scanning voltage according to the measurement result, and iteration termination conditions can be set for further improving the measurement accuracy, so that the repeated pulse can be simply, conveniently and accurately measured.
A high-speed repetitive pulse amplitude detection method comprises the steps of continuously obtaining repetitive high-speed pulse signals to one input end of a voltage comparator according to a fixed interval period, connecting the other input end of the voltage comparator with one output end of a control circuit, outputting scanning voltage signals with gradually-increased or gradually-decreased amplitude values, obtaining the scanning voltage amplitude value corresponding to the moment when the output end of the voltage comparator generates pulse output signals for the first time or the moment when the pulse output signals are not generated for the first time in a plurality of detection periods, and marking the scanning voltage amplitude value as the amplitude value of the high-speed pulse signals. The amplitude of the high-speed pulse is considered to be abrupt change, in this case, in order to further improve the measurement efficiency, an initial value and a final value of a scanning voltage in a relatively large range are directly set, if the initial value is lower than the pulse amplitude value, the amplitude of the scanning voltage is gradually increased to the final value according to a preset change curve, the period of the scanning voltage is far larger than the repetition period of the high-speed pulse signal, because the obtained high-speed pulse signal is fixed in frequency, whether the pulse signal is generated at a corresponding moment is only required to be detected, if the corresponding pulse signal is generated at the front period of the scanning voltage period all the time, but the amplitude of the scanning voltage signal corresponding to the moment when the pulse signal is not detected at the next corresponding moment is set as the amplitude of the high-speed pulse.
Compared with the prior art, the invention has the beneficial effects that:
the detection method of the invention can realize simple, convenient and accurate measurement of the repetitive pulse by connecting the scanning voltage signal with adjustable amplitude to one input end of the comparator for measurement.
The detection method of the invention sets a scanning voltage with a large range covering the high-speed pulse amplitude aiming at the high-speed repeated pulse, the repetition frequency of the high-speed pulse signal is larger than the period of the scanning voltage signal, and the scanning voltage amplitude corresponding to the moment when the output end of the voltage comparator generates the pulse output signal for the first time or the moment when the pulse output signal is not generated for the first time in the detection period is recorded as the amplitude value of the high-speed pulse signal, thereby further improving the measurement efficiency aiming at the condition of sudden change of the high-speed pulse amplitude.
Drawings
Fig. 1 is a schematic connection diagram of a repetitive pulse amplitude detection method 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, a schematic connection diagram of a repetitive pulse amplitude detection method is shown, where the detection method includes continuously acquiring a repetitive pulse signal to an input end of a voltage comparator, another input end of the voltage comparator is connected to an output end of a control circuit, the first output end is used to output a scanning voltage signal with an adjustable amplitude, the amplitude of the scanning voltage signal in a detection period is fixed, the two scanning voltage amplitudes corresponding to the two adjacent detection periods in which the output end of the voltage comparator respectively generates a pulse output signal and does not generate the pulse output signal are acquired, and the two scanning voltage amplitudes are calculated to obtain the amplitude of the pulse signal; specifically, the average value of the two values may be taken as the amplitude value of the pulse signal.
Preferably, when the far-end optical device loss is measured similarly, the amplitude of the reflected pulse needs to be received and measured, but the amplitude of the reflected pulse must be equal to or less than the amplitude of the transmitted pulse, the detection method includes inputting a scanning voltage signal with an initial set amplitude (the amplitude of the transmitted pulse can be used), to an input end of the voltage comparator, if the output end of the voltage comparator does not detect the output pulse signal within a detection period, reducing the scanning voltage signal on the basis of the initial set amplitude until the output pulse signal is detected for the first time by the output end of the voltage comparator under the scanning voltage signal with a certain amplitude, and recording the amplitude of the scanning voltage signal corresponding to the detected pulse signal for the first time as the amplitude of the pulse signal.
Preferably, when detecting a pulse signal with completely unknown amplitude, the detection method may include inputting a scan voltage signal with an initial value of zero to an input end of the voltage comparator, gradually increasing the amplitude of the scan voltage signal until, under the scan voltage signal with a certain amplitude, the output end of the voltage comparator does not detect the output pulse signal for the first time in a detection period, and recording the amplitude of the scan voltage signal corresponding to the pulse signal which is not detected for the first time as the amplitude value of the pulse signal. And, the repetition frequency of the pulse signal is larger than the period of the scanning voltage signal.
Preferably, the control circuit includes a control chip and a D/a conversion circuit connected to an output end of the control chip, and the control chip may be implemented by an FGGA chip or a single chip. The output end of the D/A conversion circuit is connected with the first output end, and the output end of the voltage comparator is connected with a digital quantity input end of the single chip microcomputer.
The second embodiment of the present invention is different from the first embodiment in that, in order to further improve the measurement accuracy, the detection method is also provided with an iteration strategy, the iteration strategy comprises the steps of inputting the average value of two scanning voltages as a reference scanning voltage to one end of a voltage comparator, re-detecting whether the voltage comparator generates a pulse signal in a detection period or not, dividing an iteration area according to a detection result, reselecting the reference scanning voltage in the iteration area and detecting circularly until the iteration condition is met, the step of dividing the iteration area according to the detection result comprises the steps of obtaining two scanning voltage amplitudes corresponding to the pulse output signal and the non-pulse output signal which are respectively generated by the output end of the voltage comparator in two adjacent detection periods, and setting the areas corresponding to the two scanning voltage amplitudes as the iteration areas. The iteration condition comprises a preset first threshold value, and the iteration condition is configured to be that when the difference between two scanning voltage amplitudes corresponding to the last measured iteration region is smaller than or equal to the first threshold value. The scanning voltage signal with adjustable amplitude is connected to one input end of the comparator for measurement, the control circuit continuously adjusts the amplitude of the scanning voltage according to the measurement result, and iteration termination conditions can be set for further improving the measurement accuracy, so that the repeated pulse can be simply, conveniently and accurately measured.
A high-speed repetitive pulse amplitude detection method comprises the steps of continuously obtaining repetitive high-speed pulse signals to one input end of a voltage comparator according to a fixed interval period, connecting the other input end of the voltage comparator with one output end of a control circuit, outputting scanning voltage signals with gradually-increased or gradually-decreased amplitude values, obtaining the scanning voltage amplitude value corresponding to the moment when the output end of the voltage comparator generates pulse output signals for the first time or the moment when the pulse output signals are not generated for the first time in a plurality of detection periods, and marking the scanning voltage amplitude value as the amplitude value of the high-speed pulse signals. The amplitude of the high-speed pulse is considered to be abrupt change, in this case, in order to further improve the measurement efficiency, an initial value and a final value of a scanning voltage in a relatively large range are directly set, if the initial value is lower than the pulse amplitude value, the amplitude of the scanning voltage is gradually increased to the final value according to a preset change curve, the period of the scanning voltage is far larger than the repetition period of the high-speed pulse signal, because the obtained high-speed pulse signal is fixed in frequency, whether the pulse signal is generated at a corresponding moment is only required to be detected, if the corresponding pulse signal is generated at the front period of the scanning voltage period all the time, but the amplitude of the scanning voltage signal corresponding to the moment when the pulse signal is not detected at the next corresponding moment is set as the amplitude of the high-speed pulse.
The working principle is as follows: the detection method of the invention measures by accessing the scanning voltage signal with adjustable amplitude at one input end of the comparator, continuously adjusts the measured pulse amplitude correspondingly according to the measurement result and approaches the real pulse amplitude step by step, thus realizing simple, convenient and accurate measurement of the repetitive pulse. And aiming at the high-speed repeated pulse, a scanning voltage which covers a large range of the high-speed pulse amplitude is set, the repetition frequency of the high-speed pulse signal is greater than the period of the scanning voltage signal, and the scanning voltage amplitude corresponding to the moment when the output end of the voltage comparator generates the pulse output signal for the first time or the moment when the pulse output signal is not generated for the first time in the detection period is recorded as the amplitude value of the high-speed pulse signal, so that the characteristic that the high-speed pulse has abrupt amplitude change is improved, and the measurement efficiency is further improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. A repetitive pulse amplitude detection method is characterized in that: the detection method comprises the steps of obtaining two scanning voltage amplitudes corresponding to the fact that the output end of the voltage comparator respectively generates a pulse output signal and does not generate the pulse output signal in two adjacent detection periods, and calculating the two scanning voltage amplitudes to obtain the amplitude value of the pulse signal.
2. A repetitive pulse amplitude detection method as defined in claim 1, characterized in that: the detection method comprises the steps that a scanning voltage signal with the amplitude value of an initial set amplitude value is input to one input end of a voltage comparator, if an output pulse signal is not detected at the output end of the voltage comparator in one detection period, the scanning voltage signal is reduced on the basis of the initial set amplitude value until the output pulse signal is detected at the output end of the voltage comparator for the first time under the scanning voltage signal with a certain amplitude value, and the amplitude value of the scanning voltage signal corresponding to the pulse signal detected for the first time is recorded as the amplitude value of the pulse signal.
3. A repetitive pulse amplitude detection method as defined in claim 1, characterized in that: the detection method comprises the steps of inputting a scanning voltage signal with an initial value of zero into one input end of a voltage comparator, gradually increasing the amplitude of the scanning voltage signal until the output end of the voltage comparator does not detect an output pulse signal for the first time in a detection period under the scanning voltage signal with a certain amplitude, and recording the amplitude of the scanning voltage signal corresponding to the pulse signal which is not detected for the first time as the amplitude value of the pulse signal.
4. A repetitive pulse amplitude detection method as defined in claim 1, characterized in that: the repetition period of the pulse signal is greater than the detection period of the scanning voltage signal, the minimum value of the scanning voltage signal is smaller than the amplitude value of the pulse signal, and the maximum value of the scanning voltage signal is greater than the amplitude value of the pulse signal.
5. A repetitive pulse amplitude detection method as defined in claim 2, characterized in that: the control circuit comprises a control chip, a D/A conversion circuit and an FPGA chip, wherein the D/A conversion circuit is connected with the output end of the control chip, the output end of the D/A conversion circuit is connected with the first output end, and the output end of the voltage comparator is connected with the digital quantity input end of the FPGA chip.
6. A repetitive pulse amplitude detection method as claimed in any one of claims 2-5, characterized in that: the detection method comprises the steps of obtaining two scanning voltage amplitudes corresponding to the fact that the output end of the voltage comparator respectively generates a pulse output signal and does not generate the pulse output signal in two adjacent detection periods, and taking the average value of the two scanning voltages as the amplitude value of the pulse signal.
7. The repetitive pulse amplitude detection method as defined in claim 6, wherein: and inputting the average value of the two scanning voltages as a reference scanning voltage to one end of a voltage comparator to re-detect whether the voltage comparator generates a pulse signal in a detection period, dividing an iteration area according to a detection result, re-selecting the reference scanning voltage in the iteration area and performing circular detection until an iteration condition is met, and terminating the iteration.
8. A repetitive pulse amplitude detection method as defined in claim 7, characterized in that: and dividing the iteration area according to the detection result comprises the steps of obtaining two scanning voltage amplitudes corresponding to the pulse output signal and the non-pulse output signal respectively generated by the output end of the voltage comparator in two adjacent detection periods and setting the areas corresponding to the pulse output signal and the non-pulse output signal as the iteration areas.
9. A repetitive pulse amplitude detection method as defined in claim 8, characterized in that: the iteration condition comprises a preset first threshold value, and the iteration condition is configured to be that when the difference between two scanning voltage amplitudes corresponding to the last measured iteration region is smaller than or equal to the first threshold value.
10. A high-speed repetitive pulse amplitude detection method is characterized in that: the method comprises the steps of continuously acquiring repeated high-speed pulse signals to one input end of a voltage comparator according to a fixed interval period, connecting the other input end of the voltage comparator with one output end of a control circuit, outputting scanning voltage signals with gradually-increased or gradually-decreased amplitude values, acquiring the scanning voltage amplitude value corresponding to the moment when the output end of the voltage comparator generates pulse output signals for the first time or the moment when the pulse output signals are not generated for the first time in a plurality of detection periods, and recording the scanning voltage amplitude value as the amplitude value of the high-speed pulse signals.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115902357A (en) * | 2023-02-15 | 2023-04-04 | 海的电子科技(苏州)有限公司 | Method and device for detecting unknown waveform voltage signal and storage medium |
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| CN203858282U (en) * | 2013-12-30 | 2014-10-01 | 长沙理工大学 | Intermediate frequency broadband digital peak detection circuit |
| CN206618807U (en) * | 2017-03-16 | 2017-11-07 | 西南交通大学 | A kind of pulsed test signal system |
| CN107543973A (en) * | 2017-07-24 | 2018-01-05 | 江苏理工学院 | A kind of rectangular pulse signal parameter measurement instrument |
| CN207689578U (en) * | 2017-10-17 | 2018-08-03 | 厦门大学嘉庚学院 | Testing integrated device occurs for pulse signal |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202433437U (en) * | 2011-12-16 | 2012-09-12 | 芜湖国睿兆伏电子股份有限公司 | Pulse signal peak level detection system |
| CN203858282U (en) * | 2013-12-30 | 2014-10-01 | 长沙理工大学 | Intermediate frequency broadband digital peak detection circuit |
| CN206618807U (en) * | 2017-03-16 | 2017-11-07 | 西南交通大学 | A kind of pulsed test signal system |
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