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A signal interval or period detection method and device for an oscilloscope

A signal interval and period detection technology, applied in measuring devices, instruments, measuring electrical variables, etc., can solve the problems of dealing with clock cycle deviation, inability to perform interval/period statistics, etc., to reduce accuracy deviation, improve efficiency, and increase signal frequency. Effect

Active Publication Date: 2020-03-10
SHENZHEN CITY SIGLENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The frequency of the input signal and the processing clock are asynchronous signals. When performing interval / period statistics, it is first necessary to synchronize the input signal to the clock domain of the processing clock. This synchronization operation will result in the calculated interval / period value being consistent with the input signal There is at least 1 to 2 processing clock cycle deviations in the real interval / period value of ;
[0005] 2. When there is no multiple relationship between the input signal interval / period and the processing clock cycle, there is an error of 0 to 1 clock cycle between the actual calculated interval / period value and the interval / period of the input signal;
[0006] 3. When the input signal interval / period is less than the processing clock cycle, interval / period statistics cannot be performed

Method used

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  • A signal interval or period detection method and device for an oscilloscope
  • A signal interval or period detection method and device for an oscilloscope
  • A signal interval or period detection method and device for an oscilloscope

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Experimental program
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Effect test

Embodiment 1

[0039] Please refer to figure 2 , a signal interval or period detection method for an oscilloscope provided by the application, comprising steps:

[0040] Step 100, receiving an analog signal, performing analog-to-digital conversion on the analog signal to obtain a high-speed digital signal;

[0041] Step 200, converting the high-speed digital signal into a low-speed parallel digital signal;

[0042] Step 300, comparing the parallel digital signal with a digital comparison level to generate a high / low level signal;

[0043] Step 400, obtain the rising edge occurrence time of each processing clock cycle of the high / low level signal, according to the duration of the high / low level signal before the rising edge of each processing clock cycle, between the rising edges of the signal and after the rising edge Time, generate a digital lookup table; the digital lookup table includes: the duration of the high / low level signal T1(x) before the rising edge of each processing clock cyc...

Embodiment 2

[0061] A signal interval or period detection method for an oscilloscope provided in this application can be realized by software.

[0062] refer to Image 6 , is a system diagram of a signal interval or period detection device for an oscilloscope in the present application, including: an analog-to-digital converter 1, a processor 5, a memory 6, and one or more programs.

[0063] The analog-to-digital converter 1 is used to receive analog signals and perform analog-to-digital conversion on the analog signals to obtain high-speed digital signals.

[0064] The processor 5 receives high-speed digital signals and executes the one or more programs.

[0065] One or more programs are stored in 6 memory for the following operations:

[0066] Receive analog signals, perform analog-to-digital conversion on the analog signals, and obtain high-speed digital signals;

[0067] Convert high-speed digital signals to low-speed parallel digital signals;

[0068] Compare the parallel digital ...

Embodiment 3

[0072] The present application also provides an oscilloscope, which includes the above-mentioned signal interval or cycle detection device, and the device is used for the interval or cycle detection of input signals.

[0073] Those skilled in the art can understand that all or part of the steps of the various methods in the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: read-only memory, Random access memory, magnetic disk or optical disk, etc.

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Abstract

The invention discloses a signal interval or cycle detection device for an oscilloscope. The signal interval or cycle detection device comprises an analog-digital converter, a processing chip, a crystal oscillator and a phase-locked loop; an analog signal input by the oscilloscope is converted into a digital signal, so that the clock frequency characteristic of the input signal is reflected by the sample frequency of analog-digital conversion, the digital signal is compared with a digital comparative level, and the rising edge emerging time of a high / low level signal obtained by the comparison is subjected to a series of analysis and calculation to obtain a signal interval / cycle statistics result. An analog-digital conversion sample clock and a chip processing clock of the signal interval or cycle detection device are always in a fold relation, the processing clock is far bigger than the sample clock, the efficiency of input signal interval / cycle statistics is improved, when the clock frequency is limited, the precision deviation of the input signal interval / cycle statistics is lowered, and available signal frequency of interval / cycle statistics is improved. Accordingly, the invention further discloses a signal interval or cycle detection method for the oscilloscope.

Description

technical field [0001] The present application relates to the field of oscilloscopes, in particular to a signal interval or cycle detection method and device for an oscilloscope. Background technique [0002] In electronic design, the quality of electronic signal transmission, electronic signal interval or cycle size are very important technical indicators. Usually, the oscilloscope is used to collect and analyze the waveform near the interval signal, which is the signal interval / period detection of the oscilloscope. The accuracy and stability of interval triggering put forward requirements. Such as figure 1 As shown, in the prior art, the input analog signal is compared with the analog level to obtain the serial high / low level, and then the high / low level is sent to the processing chip, and the processing chip uses its own processing clock The time between two consecutive rising edges of the high / low level is counted, and finally the statistical value of the processing cl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R35/00
Inventor 李振军郑文明吴乾科
Owner SHENZHEN CITY SIGLENT TECH