CN113252958A - Digital oscilloscope and automatic calibration method for delay difference between channels thereof - Google Patents
Digital oscilloscope and automatic calibration method for delay difference between channels thereof Download PDFInfo
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- CN113252958A CN113252958A CN202110797885.2A CN202110797885A CN113252958A CN 113252958 A CN113252958 A CN 113252958A CN 202110797885 A CN202110797885 A CN 202110797885A CN 113252958 A CN113252958 A CN 113252958A
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Abstract
A digital oscilloscope and an automatic calibration method for delay difference among channels thereof are disclosed, the digital oscilloscope comprises a plurality of signal input channels, a calibration signal generation module, a temperature sensor, a data processor and a display screen, wherein the signal input channels comprise a switch module, the data processor controls the switch module to be switched to the calibration signal input when calibrating the delay difference among the channels of the digital oscilloscope, and controls the calibration signal generation module to generate a plurality of paths of calibration signals to calibrate the delay difference among the channels, so that the digital oscilloscope does not need to rely on external equipment to calibrate the delay difference among the channels, and the operation is convenient and fast; the temperature in the digital oscilloscope measured by the temperature sensor is read once every preset time, and the delay difference between channels is calibrated once when the change of the read temperature and the temperature after last calibration is greater than a preset temperature change threshold value, so that the delay difference caused by the temperature change can be calibrated in real time, and the error of signal measurement is reduced.
Description
Technical Field
The invention relates to the technical field of digital oscilloscopes, in particular to a digital oscilloscope and an automatic calibration method for delay difference between channels of the digital oscilloscope.
Background
With the progress of scientific technology, the frequency of signals to be measured by electronic circuits is higher and higher, and the transmission rate of, for example, LVDS (Low Voltage Differential Signaling) is already above 1 Gbps. When an oscilloscope is used for measuring signals, the measured signals are converted into waveforms from input to the oscilloscope, and time delay exists because the measured signals pass through devices or circuits such as an analog device, an analog-to-digital conversion circuit, a physical wiring module and a waveform synthesis module. Due to individual device differences, PCB routing differences, and the like, different channels of the same oscilloscope have different delays, resulting in a delay difference that is unacceptable for timing measurement of high-speed signals. When an oscilloscope is used for measuring two or more paths of high-speed signals, the bandwidth of the oscilloscope is required to be high enough, the delay difference between the paths is required to be small enough, and otherwise, measurement errors on a time sequence are caused.
Disclosure of Invention
The application provides a digital oscilloscope and an automatic calibration method for delay difference between channels thereof, aiming at solving the problem that a larger measurement error is generated when a signal is measured due to overlarge delay difference between channels of the digital oscilloscope.
According to a first aspect, there is provided in an embodiment a digital oscilloscope, comprising:
a plurality of signal input channels, each of the signal input channels comprising a switch module, an analog front end circuit, and an analog-to-digital conversion circuit; the first input end of the switch module is used for accessing a signal to be tested, and the output end of the switch module is connected with the input end of the analog front-end circuit; the output end of the analog front-end circuit is connected with the input end of the analog-to-digital conversion circuit and used for adjusting the size of an input signal to meet the input requirement of the analog-to-digital conversion circuit; the analog-to-digital conversion circuit is used for converting an analog signal into a digital signal;
the output ends of the calibration signal generation module are respectively connected with the second input end of each switch module and used for generating a plurality of paths of calibration signals;
the temperature sensor is used for measuring the temperature in the digital oscilloscope;
the data processor is respectively connected with the control end of each switch module, the output end of each analog-to-digital conversion circuit, the control end of the calibration signal generation module and the output end of the temperature sensor, and is used for controlling the switch module to be switched to the input of a measured signal and acquiring the waveform information of the measured signal when measuring the measured signal, controlling the switch module to be switched to the input of a calibration signal when calibrating the delay difference between channels of the digital oscilloscope, controlling the calibration signal generation module to generate a plurality of paths of calibration signals, calibrating the signals output by each analog-to-digital conversion circuit, reading the temperature measured by the temperature sensor after each calibration, reading the temperature measured by the temperature sensor once every preset time, and reading the temperature measured by the temperature sensor once every preset time when the change of the read temperature and the temperature after the last calibration is greater than a preset temperature change threshold value, calibrating the delay difference between the channels for the first time;
and the display screen is connected with the data processor and used for receiving the waveform information output by the data processor and displaying the waveform.
In one embodiment, the calibration signal generation module comprises a calibration signal generator and a calibration signal buffer; the control end of the calibration signal generator is used as the control end of the calibration signal generation module, the output end of the calibration signal generator is connected with the input end of the calibration signal buffer, and the calibration signal generator is used for generating a calibration signal; the output end of the calibration signal buffer is used as the output end of the calibration signal generation module, and the calibration signal buffer is used for receiving the calibration signal generated by the calibration signal generator and dividing the calibration signal into a plurality of paths of calibration signals.
In one embodiment, the calibration signal is a fast edge signal, a sine wave signal, or a triangular wave signal.
In one embodiment, the switch module is a signal relay.
In one embodiment, the data processor calibrates the signals output by each analog-to-digital conversion circuit by:
delay differences between signals output from the respective analog-to-digital conversion circuits are measured, and the delay differences are compensated so that the delay differences between the signals output from the respective analog-to-digital conversion circuits are smaller than a predetermined value.
In one embodiment, the preset temperature variation threshold is 10 ℃.
According to a second aspect, an embodiment provides an automatic calibration method for delay difference between channels of a digital oscilloscope based on the first aspect, including:
when the digital oscilloscope is started or receives a calibration trigger signal, the switch module is controlled to be switched to a calibration signal input mode, the calibration signal generation module is controlled to generate a plurality of paths of calibration signals, and signals output by the analog-to-digital conversion circuits are calibrated;
reading and recording the temperature measured by the temperature sensor after each calibration;
the temperature measured by the temperature sensor is read once every preset time, when the change of the read temperature and the temperature after last calibration is larger than a preset temperature change threshold value, the switch module is controlled to be switched to be input with a calibration signal, the calibration signal generation module is controlled to generate a plurality of paths of calibration signals, and the signals output by the analog-to-digital conversion circuits are calibrated.
In one embodiment, the calibration signal generation module comprises a calibration signal generator and a calibration signal buffer; the control end of the calibration signal generator is used as the control end of the calibration signal generation module, the output end of the calibration signal generator is connected with the input end of the calibration signal buffer, and the calibration signal generator is used for generating a calibration signal; the output end of the calibration signal buffer is used as the output end of the calibration signal generation module, and the calibration signal buffer is used for receiving the calibration signal generated by the calibration signal generator and dividing the calibration signal into a plurality of paths of calibration signals.
In one embodiment, the preset temperature variation threshold is 10 ℃.
According to a third aspect, an embodiment provides a computer-readable storage medium having a program stored thereon, the program being executable by a processor to implement the auto-calibration method of the second aspect described above.
According to the digital oscilloscope, the automatic calibration method of the inter-channel delay difference of the digital oscilloscope and the computer-readable storage medium of the embodiment, as the calibration signal generation module is arranged in the digital oscilloscope, the switch module is arranged in the signal input channel and is used for switching between the input of the measured signal and the input of the calibration signal, when a data processor in the digital oscilloscope measures the measured signal, the switch module is controlled to be switched to the input of the measured signal, when the inter-channel delay difference of the digital oscilloscope is calibrated, the switch module is controlled to be switched to the input of the calibration signal, the calibration signal generation module is controlled to generate a plurality of paths of calibration signals, and the inter-channel delay difference is calibrated, so that the digital oscilloscope does not need to rely on external equipment to calibrate the inter-channel delay difference, the automatic calibration can be realized, and the operation is convenient; the digital oscilloscope is further provided with a temperature sensor for measuring internal temperature, the data processor reads the temperature measured by the temperature sensor once every preset time, and when the change of the read temperature and the temperature after last calibration is larger than a preset temperature change threshold value, the calibration of the delay difference between channels is carried out once, so that the delay difference caused by the temperature change can be calibrated in real time, and the error of signal measurement is reduced.
Drawings
FIG. 1 is a schematic diagram illustrating a prior art method for calibrating delay differences between channels of a digital oscilloscope;
FIG. 2 is a diagram of a digital oscilloscope in which two channels measure the delay difference of the same signal before calibration;
FIG. 3 is a diagram of two channels of the calibrated digital oscilloscope measuring the delay difference of the same signal;
FIG. 4 is a schematic diagram of a hardware configuration of a digital oscilloscope with a sampling clock module;
FIG. 5 is a schematic diagram of a digital oscilloscope according to an embodiment;
FIG. 6 is a flow chart of a method for automatic calibration of inter-channel delay differences for a digital oscilloscope according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
In the prior art, the digital oscilloscope is usually calibrated for the delay difference between channels before being shipped from a factory, so as to make the delay between the channels the same. The calibration scheme is shown in figure 1. The digital oscilloscope comprises two or more signal input channels, wherein the signal input channels comprise an analog front-end circuit and an analog-to-digital conversion circuit. The external signal source can generate a fast edge signal, the fast edge signal is a pulse signal with a fast rising edge or a fast falling edge, the fast edge signal is divided into a plurality of paths of fast edge signals after passing through the power divider and is respectively input into different signal input channels of the digital oscilloscope, and the different channels are connected with the signal source by adopting equal-length cables so as to ensure that the fast edge signals simultaneously reach each signal input channel of the digital oscilloscope. The fast edge signal is converted into a digital signal in a signal input channel after passing through an analog front-end circuit and an analog-to-digital conversion circuit, the digital signal is input into a data processor of the digital oscilloscope, the data processor restores the waveform of the original input signal, measures the delay difference of the input signal among different signal input channels, and finally eliminates the delay difference by a digital signal processing method to realize calibration. After the calibration is completed, the delay difference between the channels is small enough, and please refer to fig. 2 and fig. 3 for the waveforms before and after the calibration.
The delay caused by the signal transmission in the device, circuit and trace in the signal input channel is also called fixed delay, and the fixed delay difference between the channels caused by the fixed delay can be eliminated by the calibration in one time through the method. However, the applicant finds that the change of the temperature also affects devices in the digital oscilloscope, so that the delay of a signal input channel is changed, and the delay difference between channels is changed, especially the signal frequency measured by the digital oscilloscope is higher and higher at present, the transmission rate is faster and faster, the bandwidth of the digital oscilloscope is higher and higher, the requirement on the precision reaches ps level, and the delay difference between channels caused by the temperature change brings about a relatively large measurement error. The device which is affected by temperature change and generates delay change mainly comprises a sampling clock module and an analog-to-digital conversion circuit, and please refer to fig. 4 for a hardware structure diagram of the digital oscilloscope with the sampling clock module. The sampling clock module simultaneously provides sampling clocks for two or more analog-to-digital conversion circuits and synchronous clocks for the data processor, the two sampling clocks are synchronous, but the phases of the two sampling clocks can change under the influence of temperature, namely the delay difference changes. For example, the temperature of the PLL (Phase Locked Loop) chip LTC6951 changes by 20 ℃, and the skew (clock skew) of any two sampling clock delays at its output changes by 10 ps. The delay of the analog-to-digital conversion circuit is also greatly affected by temperature. For this reason, even if calibration is performed once before shipment, a large delay difference still occurs between channels in the later use. However, since the temperature is changing at any time, the delay difference caused by the temperature change cannot be eliminated by one calibration. Therefore, the digital oscilloscope is provided to realize real-time automatic calibration of delay difference between channels generated by temperature change and reduce errors of signal measurement.
Referring to fig. 5, a digital oscilloscope in an embodiment of the present application includes a signal input channel 1, a calibration signal generation module 2, a temperature sensor 3, a data processor 4, and a display screen 5, which are described below.
There are a plurality of signal input channels 1, and two signal input channels are exemplified in fig. 5. As shown in fig. 5, each signal input channel 1 includes a switch block 11, an analog front-end circuit 12, and an analog-to-digital conversion circuit 13. The first input end of the switch module 11 is used for accessing a signal to be measured, the second input end is connected to the calibration signal sending module 2 and used for receiving the calibration signal, the output end is connected to the input end of the analog front-end circuit 12, and the output end of the analog front-end circuit 12 is connected to the input end of the analog-to-digital conversion circuit 13. The switch module 11 is used for switching between a measured signal input and a calibration signal input, in order to prevent interference of an external input signal in a calibration process, the switch module 11 needs to be switched to the calibration signal input and disconnect the external signal, namely the input of the measured signal, the switch module 11 can be an alternative switch, a signal relay can be selected as the switch module 11, and the bandwidth of the signal relay is greater than that of the digital oscilloscope. The analog front-end circuit 12 is configured to adjust the size of the input signal to meet the input requirement of the analog-to-digital conversion circuit 13, the analog-to-digital conversion circuit 13 is configured to convert the analog signal into a digital signal and input the digital signal into the data processor 4, and the data processor 4 performs processing according to the signal sent by the analog-to-digital conversion circuit 13 in each signal input channel to complete signal measurement or delay difference calibration.
The calibration signal generating module 2 has a plurality of output terminals for generating a plurality of calibration signals, the output terminals are respectively connected to the second input terminals of the switch modules 11, and can provide the calibration signal for each signal input channel 1, and the control terminal of the calibration signal generating module 2 is connected to the data processor 4 and is controlled by the data processor 4 to generate the calibration signal. Referring to fig. 5, the calibration signal generating module 2 in one embodiment may include a calibration signal generator 21 and a calibration signal buffer 22. The control end of the calibration signal generator 21 is used as the control end of the calibration signal generating module 2, the output end is connected with the input end of the calibration signal buffer 22, and the output end of the calibration signal buffer 22 is used as the output end of the calibration signal generating module 2. When the calibration signal needs to be generated, the calibration signal generator 21 generates a calibration signal first, and inputs the calibration signal into the calibration signal buffer 22, and the calibration signal buffer 22 receives the calibration signal generated by the calibration signal generator 21 and then divides the calibration signal into multiple calibration signals for each signal input channel 1 to use. The calibration signal buffer is a calibration signal buffer, which can separate a plurality of identical signals from an input signal, and compared with a power divider, although the calibration signal buffer can separate multiple signals, the calibration signal buffer can prevent signal reflection from affecting calibration accuracy, the power divider can attenuate the calibration signal, and the more paths are divided, the more attenuation is, and the calibration signal buffer does not attenuate the calibration signal. The calibration signal may be a fast edge signal, a sine wave signal, a triangular wave signal, or the like, and accordingly, the calibration signal generator 21 may be a fast edge signal generator, a sine wave signal generator, a triangular wave signal generator, or the like.
The temperature sensor 3 is arranged in the digital oscilloscope, the output end of the temperature sensor is connected with the data processor 4, and the temperature sensor is used for measuring the temperature in the digital oscilloscope, converting the analog quantity of the temperature into digital quantity and transmitting the digital quantity to the data processor 4.
The data Processor 4 is connected to the control terminal of each switch module 11, the output terminal of each analog-to-Digital conversion Circuit 13, the control terminal of the calibration Signal generation module 2, and the output terminal of the temperature sensor 3, and the data Processor 4 may be a CPU Processor, or may also be another general-purpose Processor, a DSP (Digital Signal Processor), an Application Specific Integrated Circuit (ASIC), or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The functions of the data processor 4 according to the present invention may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. When a measured signal is measured, the data processor 4 controls the switch module 11 to be switched to the input of the measured signal, obtains the waveform information of the measured signal and sends the waveform information to the display screen 5; when the inter-channel delay difference of the digital oscilloscope is calibrated, the data processor 4 controls the switch module 11 to be switched to be input with a calibration signal, controls the calibration signal generation module 2 to generate a plurality of paths of calibration signals, the calibration signals enter the analog-to-digital conversion circuit 13 after passing through the analog front-end circuit 12, and the data processor 4 calibrates the signals output by the analog-to-digital conversion circuits 13, so that the calibration of the inter-channel delay difference of the digital oscilloscope is realized; the data processor 4 also reads the temperature measured by the temperature sensor 3 every time the calibration is performed, and reads the temperature measured by the temperature sensor 3 every preset time, and performs the calibration of the inter-channel delay difference once when the variation of the read temperature and the temperature after the last calibration is greater than a preset temperature variation threshold, that is, performs the calibration of the inter-channel delay difference once when the temperature rise is greater than the temperature variation threshold or when the temperature fall is greater than the temperature variation threshold. Therefore, the real-time monitoring of the temperature in the digital oscilloscope is realized, the delay difference can be automatically calibrated when the temperature change is overlarge, and the measurement error caused by the temperature change can be corrected in time. When the delay difference between the channels is smaller than a predetermined value, it can be considered that they are synchronized, and when the calibration of the delay difference between the channels is performed, the data processor 4 can calibrate the signals output from the respective analog-to-digital conversion circuits 13 in the following manner: the delay differences between the signals output by the analog-to-digital conversion circuits 13 are measured, and the delay differences are compensated by a digital signal processing method, so that the delay differences between the signals output by the analog-to-digital conversion circuits 13 are smaller than a predetermined value, and the conventional method can be adopted for compensating the delay differences. Under the same external temperature environment, the digital oscilloscope compares a cold machine with a heat machine, and the temperature difference of air in the machine reaches more than 10 ℃, so that the temperature change threshold can be determined to be 10 ℃.
Certainly, the digital oscilloscope can also be triggered to calibrate the delay difference between the channels when the digital oscilloscope is started or used by a user, at this time, the digital oscilloscope can control the calibration signal generation module 2 in the digital oscilloscope to generate a plurality of paths of calibration signals to each signal input channel to calibrate the delay difference between the channels, the calibration signals do not need to be generated by external equipment, automatic calibration can be realized, and the digital oscilloscope is more convenient for the user to use.
The display screen 5 is connected with the data processor 4 and is used for receiving the waveform information output by the data processor 4 and displaying the waveform.
On the basis of the digital oscilloscope, the present application further provides an automatic calibration method for delay difference between channels of the digital oscilloscope, which is applied to the data processor 4, please refer to fig. 6, and the method includes steps 110 to 140, which are specifically described below.
Step 110: and calibrating the delay difference between the channels, namely controlling the switch module 11 to be switched to the calibration signal input, controlling the calibration signal generation module 2 to generate a plurality of paths of calibration signals, and calibrating the signals output by the analog-to-digital conversion circuits 13.
As described above, the digital oscilloscope may calibrate the inter-channel delay difference when the variation of the currently read temperature and the temperature after the last calibration is greater than the preset temperature variation threshold, or may calibrate the inter-channel delay difference by triggering at the time of power-on or by the user when in use. The user can trigger the calibration of the delay difference between the channels through a button, a switch and the like arranged on the digital oscilloscope, at this time, a calibration trigger signal is sent to the data processor 4, and the data processor 4 starts to execute the calibration of the delay difference between the channels. The data processor 4 may calibrate the signals output by each analog-to-digital conversion circuit 13 by: the delay differences between the signals output by the analog-to-digital conversion circuits 13 are measured, and the delay differences are compensated by a digital signal processing method, so that the delay differences between the signals output by the analog-to-digital conversion circuits 13 are smaller than a predetermined value, and the conventional method can be adopted for compensating the delay differences.
Step 120: the temperature measured by the temperature sensor 3 is read and recorded after each calibration.
Step 130: the temperature measured by the temperature sensor 3 is read every predetermined time, and the change Δ T of the read temperature and the temperature after the last calibration is calculated.
Step 140: comparing the magnitude of the delta T with a preset temperature change threshold T0, and jumping to step 110 when the delta T is greater than T0, and jumping to step 130 when the delta T is less than or equal to T0. The temperature change threshold T0 may be set to 10 ℃.
According to the digital oscilloscope and the automatic calibration method for the inter-channel delay difference of the digital oscilloscope, the calibration signal for calibrating the inter-channel delay difference is added into the digital oscilloscope, automatic calibration is performed once in each starting process, in order to prevent interference of an external input signal in the calibration process, a switch module is additionally arranged at the input end of a signal input channel, the switch module can be controlled by a data processor to switch between the calibration signal and a measured signal, the switch module can be switched to the input of the calibration signal during calibration, the input of the external signal is cut off, therefore, when the inter-channel delay difference needs to be calibrated, the calibration signal can be directly generated inside to be calibrated, the external equipment does not need to be relied on, and the operation is convenient. Because the change of the temperature can bring the change of the delay difference, a temperature sensor is added in the digital oscilloscope to monitor the temperature in the digital oscilloscope, and when the internal temperature change of the digital oscilloscope exceeds a preset temperature change threshold value, the delay difference of each signal input channel is automatically calibrated, so that the delay difference caused by the temperature change can be calibrated in real time, and the error of signal measurement is reduced.
Reference is made herein to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope hereof. For example, the various operational steps, as well as the components used to perform the operational steps, may be implemented in differing ways depending upon the particular application or consideration of any number of cost functions associated with operation of the system (e.g., one or more steps may be deleted, modified or incorporated into other steps).
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. Additionally, as will be appreciated by one skilled in the art, the principles herein may be reflected in a computer program product on a computer readable storage medium, which is pre-loaded with computer readable program code. Any tangible, non-transitory computer-readable storage medium may be used, including magnetic storage devices (hard disks, floppy disks, etc.), optical storage devices (CD-to-ROM, DVD, Blu-Ray discs, etc.), flash memory, and/or the like. These computer program instructions may be loaded onto a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions which execute on the computer or other programmable data processing apparatus create means for implementing the functions specified. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including means for implementing the function specified. The computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified.
While the principles herein have been illustrated in various embodiments, many modifications of structure, arrangement, proportions, elements, materials, and components particularly adapted to specific environments and operative requirements may be employed without departing from the principles and scope of the present disclosure. The above modifications and other changes or modifications are intended to be included within the scope of this document.
The foregoing detailed description has been described with reference to various embodiments. However, one skilled in the art will recognize that various modifications and changes may be made without departing from the scope of the present disclosure. Accordingly, the disclosure is to be considered in an illustrative and not a restrictive sense, and all such modifications are intended to be included within the scope thereof. Also, advantages, other advantages, and solutions to problems have been described above with regard to various embodiments. However, the benefits, advantages, solutions to problems, and any element(s) that may cause any element(s) to occur or become more pronounced are not to be construed as a critical, required, or essential feature or element of any or all the claims. As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, system, article, or apparatus. Furthermore, the term "coupled," and any other variation thereof, as used herein, refers to a physical connection, an electrical connection, a magnetic connection, an optical connection, a communicative connection, a functional connection, and/or any other connection.
Those skilled in the art will recognize that many changes may be made to the details of the above-described embodiments without departing from the underlying principles of the invention. Accordingly, the scope of the invention should be determined only by the claims.
Claims (10)
1. A digital oscilloscope, comprising:
a plurality of signal input channels, each of the signal input channels comprising a switch module, an analog front end circuit, and an analog-to-digital conversion circuit; the first input end of the switch module is used for accessing a signal to be tested, and the output end of the switch module is connected with the input end of the analog front-end circuit; the output end of the analog front-end circuit is connected with the input end of the analog-to-digital conversion circuit and used for adjusting the size of an input signal to meet the input requirement of the analog-to-digital conversion circuit; the analog-to-digital conversion circuit is used for converting an analog signal into a digital signal;
the output ends of the calibration signal generation module are respectively connected with the second input end of each switch module and used for generating a plurality of paths of calibration signals;
the temperature sensor is used for measuring the temperature in the digital oscilloscope;
the data processor is respectively connected with the control end of each switch module, the output end of each analog-to-digital conversion circuit, the control end of the calibration signal generation module and the output end of the temperature sensor, and is used for controlling the switch module to be switched to the input of a measured signal and acquiring the waveform information of the measured signal when measuring the measured signal, controlling the switch module to be switched to the input of a calibration signal when calibrating the delay difference between channels of the digital oscilloscope, controlling the calibration signal generation module to generate a plurality of paths of calibration signals, calibrating the signals output by each analog-to-digital conversion circuit, reading the temperature measured by the temperature sensor after each calibration, reading the temperature measured by the temperature sensor once every preset time, and reading the temperature measured by the temperature sensor once every preset time when the change of the read temperature and the temperature after the last calibration is greater than a preset temperature change threshold value, calibrating the delay difference between the channels for the first time;
and the display screen is connected with the data processor and used for receiving the waveform information output by the data processor and displaying the waveform.
2. The digital oscilloscope of claim 1, wherein the calibration signal generation module comprises a calibration signal generator and a calibration signal buffer; the control end of the calibration signal generator is used as the control end of the calibration signal generation module, the output end of the calibration signal generator is connected with the input end of the calibration signal buffer, and the calibration signal generator is used for generating a calibration signal; the output end of the calibration signal buffer is used as the output end of the calibration signal generation module, and the calibration signal buffer is used for receiving the calibration signal generated by the calibration signal generator and dividing the calibration signal into a plurality of paths of calibration signals.
3. The digital oscilloscope of claim 1 or 2, wherein the calibration signal is a fast edge signal, a sine wave signal, or a triangle wave signal.
4. The digital oscilloscope of claim 1, wherein the switching module is a signal relay.
5. The digital oscilloscope of claim 1, wherein the data processor calibrates the signal output by each analog-to-digital conversion circuit by:
delay differences between signals output from the respective analog-to-digital conversion circuits are measured, and the delay differences are compensated so that the delay differences between the signals output from the respective analog-to-digital conversion circuits are smaller than a predetermined value.
6. The digital oscilloscope of claim 1, wherein the preset temperature change threshold is 10 ℃.
7. A method of automatically calibrating inter-channel delay differences for a digital oscilloscope as recited in any of claims 1 or 3 to 5, comprising:
when the digital oscilloscope is started or receives a calibration trigger signal, the switch module is controlled to be switched to a calibration signal input mode, the calibration signal generation module is controlled to generate a plurality of paths of calibration signals, and signals output by the analog-to-digital conversion circuits are calibrated;
reading and recording the temperature measured by the temperature sensor after each calibration;
the temperature measured by the temperature sensor is read once every preset time, when the change of the read temperature and the temperature after last calibration is larger than a preset temperature change threshold value, the switch module is controlled to be switched to be input with a calibration signal, the calibration signal generation module is controlled to generate a plurality of paths of calibration signals, and the signals output by the analog-to-digital conversion circuits are calibrated.
8. The auto-calibration method of claim 7, wherein the calibration signal generation module comprises a calibration signal generator and a calibration signal buffer; the control end of the calibration signal generator is used as the control end of the calibration signal generation module, the output end of the calibration signal generator is connected with the input end of the calibration signal buffer, and the calibration signal generator is used for generating a calibration signal; the output end of the calibration signal buffer is used as the output end of the calibration signal generation module, and the calibration signal buffer is used for receiving the calibration signal generated by the calibration signal generator and dividing the calibration signal into a plurality of paths of calibration signals.
9. The automatic calibration method of claim 7, wherein the preset temperature change threshold is 10 ℃.
10. A computer-readable storage medium, characterized in that the medium has stored thereon a program executable by a processor to implement the auto-calibration method according to any one of claims 7 to 9.
Priority Applications (1)
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