CN110426545B - Precision adjusting method based on digital compensation and digital oscilloscope - Google Patents
Precision adjusting method based on digital compensation and digital oscilloscope Download PDFInfo
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- CN110426545B CN110426545B CN201910920403.0A CN201910920403A CN110426545B CN 110426545 B CN110426545 B CN 110426545B CN 201910920403 A CN201910920403 A CN 201910920403A CN 110426545 B CN110426545 B CN 110426545B
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Abstract
A precision adjusting method based on digital compensation and a digital oscilloscope are provided, which comprises the following steps: acquiring digital waveform data of a signal; carrying out random number compensation on the numerical value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the numerical value of the data point; carrying out digital gain configuration on each compensation value to obtain a plurality of configuration values in one-to-one correspondence; intercepting each configuration value to respectively obtain a first value with the same number as the numerical value of the data point; and displaying the waveform of the signal according to the first value. Because the obtained first values present a distribution state with continuous numerical values and small proportion of the same numerical values, and no middle numerical values are lost, the waveform can present a display effect without broken lines and smooth when the waveform is displayed by using the first values, and the observation experience of technicians on the signal waveform is favorably improved.
Description
Technical Field
The invention relates to the technical field of oscilloscopes, in particular to a precision adjusting method based on digital compensation and a digital oscilloscope.
Background
Due to the development of semiconductor technology, operational amplifier background noise indexes are better and better, power supply ripples are lower and lower, so that the application scenes of the oscilloscope are more and more, voltage gears required by the oscilloscope from measurement of the operational amplifier background noise to measurement of a switching power supply are wider and wider, the gears support the voltage from a low level to a hundred uV level to a high level of tens of V levels, and the bias voltage range which can be adjusted by the gear support is tens of times or more than the positive and negative of the voltage gears of each level. The adjustment of the offset voltage is generally realized by a DAC (digital-to-analog converter), which is adapted to a range of up to several tens of V levels and a voltage step of as low as hundreds of uV levels, which has high requirements on the DAC and an operational amplifier circuit at the periphery of the DAC.
The direct current gain precision (which is an error value measured by an oscilloscope by inputting a direct current signal larger than a half screen) and the direct current bias precision (which is an error value obtained by adding a direct current signal measurement value to bias adjustment) are used as important technical indexes of the digital oscilloscope, and represent the accuracy and the credibility of the digital oscilloscope in the vertical direction. When the direct current gain precision and the direct current offset precision are improved, if the direct current gain precision and the direct current offset precision are all considered from the design of hardware, the cost is higher, and sometimes a software algorithm is adopted to meet some performance indexes, so that the cost is reduced, and certain flexibility is achieved.
At present, the gain of the digital oscilloscope is determined by an attenuation network and an adjustable gain amplifier together, the attenuation network plays a rough adjustment role, and generally has one-time attenuation to ten-time attenuation, and dozens of times attenuation to one-hundred-time attenuation; the adjustable gain amplifier plays a fine adjustment role, the amplification factor of the adjustable gain amplifier can be dozens of times to several zero times, but a certain stepping value exists, and the fineness of the stepping value can not necessarily meet the requirement that the digital oscilloscope has high gain precision under all gears. Therefore, the direct current gain precision of the modern digital oscilloscope in some voltage gears is not high enough, and the signal waveform in some voltage gears is easy to generate obvious broken lines to influence the observation effect of the waveform signal; particularly, in a small voltage step, due to the fact that the resolution of the DAC is not high enough, when the channel offset is adjusted, the waveform offset is not changed or changes in a jumping mode, and the phenomenon that the waveform adjustment change is displayed discontinuously occurs.
Disclosure of Invention
The invention mainly solves the technical problems of how to improve the direct current gain precision and the direct current offset precision of the existing digital oscilloscope and how to solve the problems of adjusting channel offset and discontinuous waveform offset display change under a small voltage gear. In order to solve the technical problem, the application provides a precision adjusting method based on digital compensation and a digital oscilloscope.
According to a first aspect, an embodiment provides a precision adjustment method based on digital compensation, including: acquiring digital waveform data of a signal; the digital waveform data is obtained by performing analog-to-digital conversion on the signal; performing random number compensation on the numerical value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the numerical value of the data point; performing digital gain configuration on each compensation value to obtain a plurality of configuration values in one-to-one correspondence; intercepting each configuration value to respectively obtain a first value with the same number as the data point; and displaying the waveform of the signal according to the first value.
The performing random number compensation on the numerical value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the numerical value of the data point includes: performing terminal bit expansion on the analog-to-digital conversion code corresponding to the numerical value of each data point in the digital waveform data according to a preset expansion bit number to obtain a plurality of random values formed after the terminal bit expansion; performing first numerical value quantization processing on each random value according to the expansion bit number to obtain a plurality of compensation values corresponding to the numerical values of the data points; the first numerical quantization process is to divide each of the random numbers by a power of a first exponent of two, the first exponent being the number of the extension bits.
The performing digital gain configuration on each compensation value respectively to obtain a plurality of configuration values in one-to-one correspondence includes: and multiplying each compensation value by a preset multiplication coefficient respectively to perform digital gain configuration on each compensation value respectively, and obtaining a plurality of configuration values corresponding to each compensation value one to one according to a calculation result.
The setting process of the multiplication coefficient comprises the following steps: acquiring a theoretical coefficient and an actual coefficient of the variable gain amplifier, and acquiring the sum of the expansion bit number and the bit number of the analog-to-digital conversion code; the variable gain amplifier is used for amplifying and adjusting the signals so as to perform analog-to-digital conversion on the amplified and adjusted signals to obtain the digital waveform data; performing second numerical value quantization processing according to a result of comparison between the actual coefficient and the theoretical coefficient, and calculating to obtain the multiplication coefficient; and the second numerical value quantization processing is to multiply the result of comparison between the actual coefficient and the theoretical coefficient by a second exponential power of two, wherein the second exponent is the sum of the expansion bit number and the bit number of the analog-to-digital conversion coding.
The intercepting each configuration value to obtain a first value with the same number as the data point value respectively comprises: rounding each configuration value to reserve a numerical value on an integer bit of the configuration value; and respectively obtaining a first value with the same digits as the numerical value of the data point according to the rounding processing result.
The displaying the waveform of the signal according to the first value further comprises: sequentially setting a first configuration value corresponding to each line of display pixels in the waveform of the signal, and changing offset codes corresponding to a plurality of lines of display pixels in the waveform of the signal by using a plurality of first configuration values so as to perform offset display adjustment on the corresponding lines of display pixels according to the offset codes; the first configuration value is used for adjusting a corresponding row of display pixels in the waveform of the signal by one analog bias voltage signal, and the bias code is used for adjusting a corresponding row of display pixels in the waveform of the signal by a plurality of analog bias voltage signals; when the currently set first configuration value is judged not to cause the change of the bias code, setting a second configuration value corresponding to a row of display pixels with adjustable first configuration value, and performing bias display compensation on the row of display pixels according to the second configuration value; the second configuration value is used for adjusting a corresponding row of display pixels in the waveform of the signal through a digital bias waveform; and when the currently set first configuration value is judged to cause the change of the configuration code, carrying out offset display adjustment on the corresponding rows of display pixels according to the changed offset code, and resetting the second configuration value.
According to a second aspect, there is provided in one embodiment a digital oscilloscope, comprising: the attenuation network is used for carrying out attenuation adjustment on the input signal so as to output a first adjustment signal; the adjustable gain amplifier is used for amplifying and adjusting the first adjusting signal so as to output a second adjusting signal; an analog-to-digital converter for performing analog-to-digital conversion on the second adjustment signal to output digital waveform data of the signal; a controller, connected to the analog-to-digital converter, for performing precision adjustment on the digital waveform data according to the precision adjustment method in the first aspect, and controlling to form a waveform of the signal according to a first value obtained after the precision adjustment; and the display is used for displaying the waveform of the signal.
The digital oscilloscope further comprises a bias adjusting circuit and an impedance transformation network; the controller comprises a waveform processing unit and a central processing unit; the central processing unit is connected with the bias adjusting circuit and the waveform processing unit, the central processing unit sequentially sets a first configuration value corresponding to each line of display pixels in the waveform of the signal, and changes bias codes corresponding to a plurality of lines of display pixels in the waveform of the signal by using a plurality of first configuration values; when the central processing unit judges that the currently set first configuration value does not cause the change of the bias code, setting a second configuration value corresponding to a row of display pixels with adjustable first configuration value, and sending the second configuration value to the waveform processing unit; when the central processing unit judges that the configuration code is changed due to the currently set first configuration value, carrying out offset display adjustment on the corresponding rows of display pixels according to the changed offset code, and resetting the second configuration value; a digital-to-analog converter is arranged in the bias adjusting circuit and used for responding to the first configuration value to generate a plurality of analog bias voltage signals; the impedance conversion network is connected with the attenuation network, the adjustable gain amplifier and the bias adjusting circuit, and is used for performing signal superposition on a first adjusting signal output by the attenuation network by using a plurality of analog bias voltage signals generated by the bias adjusting circuit to form a new first adjusting signal and inputting the new first adjusting signal to the adjustable gain amplifier, so that the adjustable gain amplifier performs amplification adjustment on the new first adjusting signal to form a new second adjusting signal, and the analog-to-digital converter performs analog-to-digital conversion on the new second adjusting signal and outputs new digital waveform data of the signal; the waveform processing unit carries out precision adjustment on the new digital waveform data and outputs a new first value obtained after the precision adjustment; and the waveform processing unit is further used for carrying out offset display compensation on one or more rows of display pixels corresponding to the new first value according to the second configuration value, and forming the waveform of the signal according to the new first value and the one or more rows of display pixels subjected to offset display compensation.
The central processing unit is also connected with the adjustable gain amplifier and used for configuring the gain of the adjustable gain amplifier; the central processing unit is further used for generating a configuration menu of the waveform of the signal and sending the configuration menu to the waveform processing unit, so that the waveform processing unit displays and superposes the configuration menu and the waveform of the signal to obtain display superposition data; the central processing unit is further configured to send the display overlay data to the display for display.
According to a third aspect, an embodiment provides a computer-readable storage medium, which includes a program executable by a processor to implement the accuracy adjustment method of the first aspect.
The beneficial effect of this application is:
according to the precision adjusting method based on digital compensation and the digital oscilloscope, the precision adjusting method comprises the following steps: acquiring digital waveform data of a signal; carrying out random number compensation on the numerical value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the numerical value of the data point; carrying out digital gain configuration on each compensation value to obtain a plurality of configuration values in one-to-one correspondence; intercepting each configuration value to respectively obtain a first value with the same number as the numerical value of the data point; and displaying the waveform of the signal according to the first value. The digital oscilloscope comprises an attenuation network, an adjustable gain amplifier, an analog-to-digital converter, a controller and a display, and further comprises a bias adjusting circuit and an impedance transformation network. In the first aspect, because the value of each data point in the digital waveform data is subjected to random number compensation, a plurality of similar compensation values can be generated through bit expansion and quantization processing on the basis of the value of the data point, and the compensation values are the expansion of the original value, so that convenience can be brought to the subsequent digital gain configuration processing; in the second aspect, the obtained compensation values are subjected to digital gain configuration, so that a plurality of configuration values corresponding to one another can be obtained, the configuration values are no longer a constant value, and a plurality of identical or adjacent first values can be obtained after truncation processing is performed on the configuration values, so that the situation that intermediate values are lost due to gain configuration only on original values can be avoided; in the third aspect, the obtained first values present a distribution state with continuous numerical values and small proportion of the same numerical values, and no missing intermediate numerical values, so that when the first values are used for displaying the waveform, the waveform presents a smooth display effect without broken lines; in the fourth aspect, when it is judged that the offset coding is changed due to the currently set first configuration value, offset display adjustment is performed on the corresponding multiple rows of display pixels through the offset coding, otherwise, offset display compensation is performed on the row of display pixels through setting the second configuration value corresponding to the row of display pixels with the adjustable first configuration value, so that the multiple rows of display pixels and the single row of display pixels can be subjected to offset display adjustment, the conditions of waveform display distortion and display broken lines caused by simultaneous offset of the multiple rows of display pixels can be effectively avoided, and the observation experience of technicians on signal waveforms can be further improved; in a fifth aspect, the digital oscilloscope claimed by the application fully utilizes a hardware framework of the existing digital oscilloscope, realizes functions such as random number compensation, digital gain configuration, bias display adjustment, bias display compensation and the like through a controller, optimizes the display state of signal waveforms through gain compensation and bias compensation, and is favorable for achieving the display effect of eliminating broken lines and smooth change; in a sixth aspect, the digital oscilloscope optimizes the gain compensation and the offset compensation algorithm, can well realize that all voltage gears have better gain precision, and can support the change of offset display and be embodied on waveform display under a small voltage gear, thereby enhancing the visual effect of the waveform display and improving the observation experience of technicians.
Drawings
FIG. 1 is a flow chart of a digital compensation based precision adjustment method in the present application;
FIG. 2 is a flow chart of random number compensation of the value of each data point in the digital waveform data;
FIG. 3 is a flow chart of digital gain configuration for each compensation value;
FIG. 4 is a flow chart of offset display adjustment for multiple rows of display pixels;
FIG. 5 is a schematic diagram of a digital oscilloscope according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a digital oscilloscope according to another embodiment of the present application.
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).
The first embodiment,
Referring to fig. 1, the present application provides a precision adjustment method based on digital compensation, which mainly includes steps S100-S500, which are described below.
Step S100, digital waveform data of the signal is acquired.
In this embodiment, the digital waveform data of the analog signal can be obtained by sampling the signal, for example, by subjecting the signal to analog-to-digital conversion by means of an analog-to-digital conversion device (ADC).
Step S200, performing random number compensation on the value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the value of the data point. In one embodiment, see FIG. 2, the step S200 may include steps S210-S220, respectively, as described below.
Step S210, performing end expansion on the analog-to-digital conversion code corresponding to the value of each data point in the digital waveform data according to a preset expansion bit number, to obtain a plurality of random values formed after the end expansion.
It should be noted that when an analog signal passes through an analog-to-digital conversion device, the analog-to-digital conversion device often outputs a set of binary encoded data. For example, when an 8-bit analog-to-digital conversion device is used for sampling an analog signal at a certain moment, a group of 8-bit parallel data is output, so that a group of analog-to-digital conversion codes are formed, and the numerical value of a data point can be obtained after the group of analog conversion codes are subjected to binary conversion.
In this embodiment, if the number of bits of the analog-to-digital conversion code (i.e., the number of output bits of the analog-to-digital conversion device) isB adc The preset number of extension bits isB exp Then, at the end of the analog-to-digital conversion coding, a bit stream can be addedB exp The binary numbers are used for carrying out end bit expansion on the analog-digital conversion codes so as to form the number of bits ofB adc +B exp Each new code generated randomly will correspond to a random value after the binary conversion.
For example, assume that the value (decimal value) of one data point in the digital waveform data is 50, which corresponds toB adc The A/D conversion coding of =8 bits is 110010, and 110010 is carried outB exp The new codes that can be randomly formed include 11001000 (corresponding to decimal random value 200), 11001001 (corresponding to decimal random value 201), 11001010 (corresponding to decimal random value 202), and 11001011 (corresponding to decimal random value 203).
Step S220, performing a first numerical quantization process on each random value according to the expansion bit number to obtain a plurality of compensation values corresponding to the numerical value of the data point. In this embodiment, the first numerical quantization process is to divide each random number by a power of a first exponent of two, where the first exponent is an extension bit number.
For example, if the first exponent = extended number of bits =B exp =2, then for the random value 200 formed after the end-point expansion of the value 50 of the data point, the pass is 200/(2)2) The operation method of (3) obtains a corresponding compensation value of 50 after the first numerical quantization process is performed. Accordingly, the compensation values obtained after the first numerical quantization process are 50.25, 50.5, and 50.75 for the random values 201, 202, and 203, respectively.
Step S300, digital gain configuration is respectively carried out on each compensation value to obtain a plurality of configuration values in one-to-one correspondence. In one embodiment, see FIG. 3, the step S300 includes steps S310-S330, respectively, as described below.
Step S310, obtaining theoretical coefficient and actual coefficient of Variable Gain Amplifier (VGA), and obtaining sum of expansion digit and digit of analog-digital conversion code. The variable gain amplifier is used to amplify and adjust the signal, so as to perform analog-to-digital conversion on the amplified and adjusted signal to obtain the digital waveform data in step S100.
Step S320, performing a second numerical quantization process according to the result of comparing the actual coefficient with the theoretical coefficient, and calculating to obtain a multiplication coefficient. The second numerical quantization process here is to multiply the result of comparison between the actual coefficient and the theoretical coefficient by a second exponential power of two, which is the sum of the number of extension bits and the number of bits of the analog-to-digital conversion code.
For example, assume that the theoretical coefficient of a Variable Gain Amplifier (VGA) isV 1The actual coefficient isV 2And the sum of the number of extension bits and the number of modulo coding bits isB adc +B exp Then by the formulal=V 2/V 1*2^(B adc +B exp ) To perform a second numerical quantization process. For theV 1=15.4，V 2=15，B adc +B exp =8+2=10, then 15/15.4 × 2 is passed10Calculating to obtain a multiplication coefficient ofl=997。
It should be noted that, in the prior art, this multiplication coefficient does not exist, and in the case of not considering some other uncertainty errors (including some random errors and measurement errors), the gain error in one measurement step is: (V 1/V 2-1); after the technical scheme of the invention adds the multiplication coefficient, the lean error of the measurement gear is (l/2^ B Measurement of* V 1/V 2-1) whereinB Measurement of= B adc +B exp The maximum error is 1/(2^ s) B Measurement of+1)，B Measurement ofThe larger the bit, the closer the error is to 0. At present, the input bit width of an internal multiplier of a data processing device (such as FPGA) can basically reach 18 bits or more, so the maximum error 1/(2^ s) which can be theoretically designed B Measurement of+1) is very close to 0, much less than 3% of the current industry index, so that the theoretical performance of the technical scheme of the application is higher than that of other existing technical schemes.
And step S330, multiplying each compensation value by a preset multiplication coefficient respectively to perform digital gain configuration on each compensation value respectively, and obtaining a plurality of configuration values corresponding to each compensation value one to one according to the calculation result.
For example, if the preset multiplication coefficient is 0.9, the calculated results 45, 45.225, 45.454, 45.675 are obtained after digital gain configuration is performed on the compensation values 50, 50.25, 50.5, 50.75, respectively, and then the configuration values corresponding to the compensation values 50, 50.25, 50.5, 50.75 are 45, 45.225, 45.454, 45.675, respectively.
It should be noted that steps S310 and S320 are mainly a setting process of the multiplication coefficient, and the multiplication coefficient is often calculated when the digital gain configuration is performed for the first time, and if the multiplication coefficient is already set in advance, steps S310 to S320 may be omitted.
Step S400, intercepting each configuration value to obtain a first value with the same number as the numerical value of the data point, wherein the data point refers to the data point involved in the step S200.
In one embodiment, each configuration value is rounded separately to preserve the value at the integer bit of the configuration value; and respectively obtaining first values with the same digits as the numerical values of the data points according to the rounding processing result. Here, the rounding processing may be a rounding processing, and preferably a fractional part discarding processing.
For example, for configuration values 45, 45.225, 45.454, 45.675 resulting from a value of 50 for a data point, the rounded values are 45, respectively, and the rounded values can be the first value of the same number of bits as the value of 50 for the data point (e.g., both eight-bit binary values).
For example, the compensation values obtained by performing random number compensation on the value 51 of the data point may be 51, 51.25, 51.5, and 51.75, the configuration values obtained by performing digital gain configuration on each compensation value may be 45.9, 46.125, 46.35, and 46.575, and the rounding values may be 45, 46, and 46, respectively, and the rounded values may be the first value of the same number of digits as the value 51 of the data point (e.g., all eight-digit binary values).
For another example, the compensation values obtained by performing random number compensation on the value 52 of the data point may be 52, 52.25, 52.5, and 52.75, the configuration values obtained by performing digital gain configuration on each compensation value may be 46.8, 47.025, 47.25, and 47.475, and the rounding values may be 46, 47, and 47, respectively, and the rounding values may be the first values of the same digits as the value 52 of the data point (e.g., binary values of eight digits).
From these examples, it can be seen that for three consecutive data points 50, 51, 52 in the digital waveform data, the first values obtained are 5 in number of values 45, 4 in number of values 46, and 3 in number of values 47. Then, when the probabilities of the added random values are equal, the number of N occurrences is M or M +1, and the larger the number of bits of the random value is, the larger M is, and the lower the proportion of 1 which is a difference between M and M +1 is, so that the waveform can be seen smoothly without a fixed broken line when displayed according to the first value.
And step S500, displaying the waveform of the signal according to the first value. Specifically, the obtained respective first values are converted into voltage values of the signal waveforms, so that the waveforms of the signals are presented on the display screen.
In this embodiment, the value of each data point in the digital waveform data is subjected to random number compensation to obtain a plurality of corresponding compensation values, each compensation value is subjected to digital gain configuration to obtain a plurality of corresponding configuration values, and each configuration value is intercepted to obtain a first value with the same number as the value of the data point, so that the value of each data point is reasonably configured, and therefore, under the condition that the intermediate value required in waveform display is not discarded, the proportion of continuous output of each output value can be reduced, and the application effects of smooth display and broken line elimination are brought to the waveform of the signal.
As can be understood by those skilled in the art, the technical scheme has certain positive effects compared with the existing waveform display technology. In the conventional waveform display technology, random number compensation is not performed on digital waveform data, but a value of each data point in the digital waveform data is directly multiplied by a set multiplication coefficient, and rounding processing is performed to obtain an output value (i.e., a first value in the present embodiment) required for waveform display, for example, when the multiplication coefficient is set to 1.1 (here, for simplicity of calculation, the number of quantization bits is not considered), the output value obtained by calculation is 53 (53.9 is a result of rounding processing) when the value of the data point is set to 49; for the case that the value of the data point is 50, the calculated output value is 55; the output value jumps directly from 53 to 55, and the output value 54 is inevitably discarded, so that a significant vertical fold line appears when the waveform is displayed, and the observation experience of the signal waveform by the technician will be applied. For another example, when the multiplication coefficient is set to 0.9, the output value obtained by calculation is 44 (44.1 is a result of rounding processing) when the value of the data point is 49; for the case that the value of the data point is 50, the output value obtained by calculation is constant to be 45; for the case where the value of the data point is 51, the calculated output value is 45 (45.9 as a result of rounding processing); the output value is now no longer gently changing but is still output 45, and a significant horizontal fold line will appear when the waveform is displayed. The solutions provided in steps S100-S500 can then solve the problems encountered in the existing waveform display technology.
In addition, as will be understood by those skilled in the art, in order to implement offset display of a signal waveform in the prior art, an analog offset voltage is often superimposed on an input analog signal, the analog offset voltage is obtained by applying a configuration value to a DAC, so that the analog offset voltage and the analog signal are superimposed and then input to the ADC for sampling, and the adjustment precision of the analog offset voltage is the voltage value corresponding to one row of display pixels of the screen. However, in the prior art, limited by the range of the DAC, in the same attenuation step, if the adjustable range of the maximum voltage step in one attenuation step is to be satisfied, in a smaller voltage step, there are 1 DAC codeword (i.e. the binary digital-to-analog conversion code of the DAC) equivalent voltage value greater than the voltage value corresponding to one row of display pixels, and then the 1 DAC codeword can be really changed when the offset of a plurality of rows of display pixels is changed, so that when the offset is changed without changing the input analog signal, the waveform sampled by the ADC is either not changed at all, or suddenly jumps over a plurality of rows of display pixels, which brings adverse effects to the offset display of the signal waveform.
When the above-described situation that multiple rows of display pixels are simultaneously offset occurs, the signal waveform display will be distorted, and an unexpected display broken line will appear, which seriously affects the observation experience of the technician on the signal waveform. In order to solve the problem and improve the stable display state of the signal waveform, the present application further optimizes the technical solution of the present embodiment, please refer to fig. 4, and further includes step S600 (i.e. after step S500) after displaying the signal waveform according to the obtained first value, which includes steps S610-S650, which are described as follows.
Step S610, sequentially setting a first configuration value corresponding to each row of display pixels in the waveform of the signal, where the first configuration value is used to adjust a row of display pixels corresponding to the waveform of the signal by an analog bias voltage signal.
It should be noted that the first configuration value may generate an analog offset voltage signal after being applied to a DAC (digital-to-analog conversion), so that the analog offset voltage signal and the analog signal are superimposed and then input to the ADC (analog-to-digital conversion) for sampling, and the adjustment precision of the analog offset voltage signal is the voltage value corresponding to one row of display pixels of the screen.
Step S620, changing bias codes corresponding to the multiple rows of display pixels in the waveform of the signal by using the multiple first configuration values, so as to perform bias display adjustment on the corresponding multiple rows of display pixels according to the bias codes. The offset coding here is used to adjust the corresponding rows of display pixels in the waveform of the signal by a plurality of analog offset voltage signals.
It should be noted that the offset coding is digital-to-analog conversion coding of the DAC, and when a binary value of one bit changes in the digital-to-analog conversion coding, the DAC is caused to output another analog offset voltage signal, which has a plurality of differences in adjustment accuracy compared with the previous analog offset voltage signal, so as to cause the corresponding rows of display pixels to perform offset display adjustment.
Step S630, determine whether the currently set first configuration value causes a change in the offset coding, if not, go to step S640, and if so, go to step S650.
It should be noted that since one offset code can adjust corresponding rows of display pixels and one first configuration value can adjust corresponding rows of display pixels, the offset code may be changed when consecutive rows of display pixels are continuously adjusted by the first configuration value.
Step S640, when it is determined that the currently set first configuration value does not cause a change in the offset coding, a second configuration value corresponding to a row of display pixels with adjustable first configuration value is set, so as to perform offset display compensation on the row of display pixels according to the second configuration value. The second configuration value here is for a corresponding row of display pixels in the waveform of the adjustment signal by one digital bias waveform.
It should be noted that when the technician biases to display a certain row of display pixels by setting the first configuration value, the row of display pixels is not changed, and the changed row of display pixels can be changed by the second configuration value. The second configuration value is directly used for adjusting the digital signal required by display, and the limitation that the analog signal needs to be subjected to superposition processing when the first configuration value is used is avoided.
For example, when the first configuration value corresponding to the 1 st row of display pixels is set without causing the DAC code word (i.e., offset coding) to change, the second configuration value may be set to perform offset display compensation on the row of display pixels, and add 1 to the waveform display offset, i.e., add 1 to the digital waveform signal required for the row of display pixels, so that the row of display pixels is offset by one pixel unit. When the first configuration value corresponding to the 2 nd row of display pixels is set to not cause the DAC code word change, the second configuration value may be set to perform offset display compensation on the row of display pixels, so as to add 2 to the waveform display offset. And analogizing in sequence, until the first configuration value corresponding to the display pixel of the nth row is set to cause the change of the DAC code words, the waveform display bias is adjusted back to 0, namely 0 is added to the digital waveform signal required by the display pixel of the nth row, so that the adjustment of the waveform is ensured to be smooth. That is, when the first offset value corresponding to the display pixel of the N-1 th row is set to not cause the change of the DAC codes, the waveform display offset is adjusted to be N-1, and until the DAC codes are changed due to the adjustment of the offset of the display pixel of the N-1 th row, the display offset is adjusted to return to 0.
Step S650, when it is determined that the configuration code is changed due to the currently set first configuration value, performing offset display adjustment on the corresponding rows of display pixels according to the changed offset code, and resetting the second configuration value, that is, returning the waveform display offset to 0.
In summary, in the embodiment, the signal waveform is optimized through functions of random number compensation, digital gain configuration, offset display adjustment, offset display compensation, and the like, and some application advantages can be achieved: (1) because the numerical value of each data point in the digital waveform data is subjected to random number compensation, a plurality of similar compensation values can be generated through bit expansion and quantization processing on the basis of the numerical value of the data point, and the compensation values are expansion of the original numerical value and can bring convenience for subsequent digital gain configuration processing; (2) the obtained compensation values are subjected to digital gain configuration, so that a plurality of configuration values in one-to-one correspondence can be obtained, the configuration values are no longer a constant value, and the method is favorable for obtaining a plurality of same or adjacent first values after truncation processing, so that the condition that intermediate values are lost due to gain configuration only on original values can be avoided; (3) because the obtained first values present a distribution state with continuous numerical values and small proportion of the same numerical values, and no missing intermediate numerical values, the waveform can present a smooth display effect without broken lines when the waveform display is carried out by using the first values; (4) when the offset coding is changed due to the judgment of the currently set first configuration value, offset display adjustment is carried out on the corresponding multiple rows of display pixels through the offset coding, otherwise, offset display compensation is carried out on the rows of display pixels through the setting of the second configuration value corresponding to the row of display pixels with the adjustable first configuration value, so that the multiple rows of display pixels and the single row of display pixels can be subjected to offset display adjustment, the conditions of waveform display distortion and display broken lines caused by the simultaneous offset of the multiple rows of display pixels can be effectively avoided, and the observation experience of technicians on signal waveforms is further improved.
Example II,
Referring to fig. 5, the present application provides a digital oscilloscope 1, which mainly includes an attenuation network 11, an adjustable gain amplifier 12, an analog-to-digital converter 13, a controller 14 and a display 15, which are respectively described below.
The attenuation network 11 is used for performing attenuation adjustment on the input signal to adjust the size of the signal in the circuit, and finally outputting a first adjustment signal. Here, the input signal may be an analog signal, and the output first adjustment signal is also an analog signal; the attenuation network 11 may have one-time attenuation, ten-time attenuation, and several tens of times attenuation to one hundred times attenuation, which is not limited herein. Since the attenuation network 11 is a common analog signal processing device in a digital oscilloscope, and belongs to the prior art, it is not described here again.
The adjustable gain amplifier 12 is configured to perform amplification adjustment on the first adjustment signal to output a second adjustment signal. The adjustable gain amplifier 12 is also called a Variable Gain Amplifier (VGA), and mainly functions to adjust the amplification factor of the signal, for example, for a first adjustment signal with a voltage of 1mV, if the gain of the adjustable gain amplifier is 1000, the voltage of the output second adjustment signal is 1V. The adjustable gain amplifier 12 plays a fine tuning role, and the amplification factor thereof may be several times, several tens of times, several hundreds of times, several thousands of times, and is not limited herein. Since the adjustable gain amplifier 12 is an analog signal processing device commonly used in digital oscilloscopes, and belongs to the prior art, the details are not described here.
The analog-to-digital converter 13 is also called ADC, and is configured to perform analog-to-digital conversion on the second adjustment signal to output digital waveform data of the signal. Since the analog-to-digital converter is a common analog signal processing device in a digital oscilloscope, and belongs to the prior art, the description is omitted here.
The controller 14 is connected to the analog-to-digital converter 13, and is configured to perform precision adjustment on the digital waveform data according to the precision adjustment method disclosed in steps S100-S500 in the first embodiment, and control the waveform of the forming signal according to the first value obtained after the precision adjustment.
The display 15 is connected to the controller 14 and displays a waveform of the signal.
In this embodiment, the controller 14 may include an acquisition module, a random number compensation module, a digital gain configuration module, a truncation module, and a display control module.
The acquisition module is used for acquiring digital waveform data of the signal, wherein the digital waveform data is obtained by performing analog-to-digital conversion on the signal. For the functional description of the obtaining module, reference may be specifically made to step S100 in the first embodiment, and details are not described here.
The random number compensation module is used for carrying out random number compensation on the numerical value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the numerical value of the data point. For a functional description of the random number compensation module, reference may be specifically made to step S200 in the first embodiment, which is not described herein again.
The digital gain configuration module is used for performing digital gain configuration on each compensation value respectively to obtain a plurality of configuration values in one-to-one correspondence. For the functional description of the digital gain configuration module, reference may be specifically made to step S300 in the first embodiment, and details are not described here.
The intercepting module is used for intercepting each configuration value to respectively obtain a first value with the same digit as the numerical value of the data point. For the functional description of the intercepting module, reference may be specifically made to step S400 in the first embodiment, and details are not described here.
And the display control module is used for displaying the waveform of the signal according to the obtained first value. For the functional description of the display control module, reference may be made to step S500 in the first embodiment, which is not described herein again.
In another embodiment, referring to fig. 6, the digital oscilloscope 1 further comprises a bias adjusting circuit 16, an impedance transformation network 17, and the controller 14 comprises a waveform processing unit 141 and a central processing unit 142. The following are described separately.
The central processing unit 142 may be an arithmetic processing device such as a CPU, which is connected to the bias adjusting circuit 16 and the waveform processing unit 141, and is used for the precision adjusting method mentioned in steps S610 to S650 in the first embodiment. Specifically, the central processing unit 142 sequentially sets a first configuration value corresponding to each row of display pixels in the waveform of the signal, and changes the offset coding corresponding to the plurality of rows of display pixels in the waveform of the signal by using the plurality of first configuration values. The central processing unit 142 is further configured to set a second configuration value corresponding to a row of display pixels with an adjustable first configuration value when the currently set first configuration value does not cause a change in the offset coding, and send the second configuration value to the waveform processing unit 141, so that the waveform processing unit 141 performs offset display compensation on the row of display pixels according to the second configuration value. The central processing unit 142 is further configured to send the changed bias code to the bias adjusting circuit when it is determined that the currently set first configuration value causes the configuration code to change, so that the bias adjusting circuit 16 performs bias display adjustment on the corresponding rows of display pixels according to the changed bias code, and resets the second configuration value.
A digital-to-analog converter (DAC) is provided within the offset adjustment circuit 16 for generating a plurality of analog offset voltage signals in response to the first configuration value. Since the bias adjusting circuit 16 is a commonly used digital signal processing device in a digital oscilloscope, and belongs to the prior art, it is not described here again.
The impedance transformation network 17 is connected to the attenuation network 11, the adjustable gain amplifier 12 and the bias adjusting circuit 16, and is configured to superimpose the first adjusting signal output by the attenuation network with a plurality of analog bias voltage signals generated by the bias adjusting circuit 16 to form a new first adjusting signal, and input the new first adjusting signal to the adjustable gain amplifier 12, so that the adjustable gain amplifier 12 amplifies and adjusts the new first adjusting signal to form a new second adjusting signal, and the analog-to-digital converter 13 also outputs new digital waveform data of the signal after performing analog-to-digital conversion on the new second adjusting signal.
The waveform processing unit 141 may be a programmable logic processing device such as an FPGA, and is configured to perform precision adjustment on the new digital waveform data according to the precision adjustment method described in steps S100 to S500 in the first embodiment, and output a new first value obtained after the precision adjustment; the waveform processing unit 141 is further configured to perform offset display compensation on one or more rows of display pixels corresponding to the new first value according to the second configuration value, and form a waveform of a signal according to the new first value and the offset display compensated one or more rows of display pixels. In one embodiment, the waveform processing unit 141 includes an acquisition module, a random number compensation module, a digital gain configuration module, a truncation module, and a display control module, so that the new waveform data is precision-adjusted through these functional modules.
Further, the central processing unit 142 is also connected to the adjustable gain amplifier 12 for configuring the gain of the adjustable gain amplifier. The central processing unit 142 is further configured to generate a configuration menu of the waveform of the signal (the configuration menu may include items such as a status bar and a network), and send the configuration menu to the waveform processing unit 141, so that the waveform processing unit 141 displays and superimposes the configuration menu and the waveform of the signal, thereby obtaining display superimposed data. The central processing unit 142 is then also used to send the display overlay data to the display for display.
To sum up, the digital oscilloscope to be protected in this embodiment fully utilizes the hardware architecture of the existing digital oscilloscope, and implements functions such as random number compensation, digital gain configuration, and the like through the waveform processing unit in the controller, and implements functions such as offset display adjustment, offset display compensation, and the like through the central processing unit in the controller, so that the digital oscilloscope can optimize the display state of the signal waveform by using the gain compensation and offset compensation modes, and is favorable for achieving the display effect of eliminating broken lines and smooth changes. In addition, the digital oscilloscope optimizes the gain compensation and the offset compensation algorithm, can well realize that all voltage gears have better gain precision, and can support the change of offset display and display the offset display on the waveform display under the small voltage gear, thereby enhancing the visual effect of the waveform display and improving the observation experience of technicians.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a processor, all or part of the functions in the above embodiments may be implemented.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A precision adjusting method based on digital compensation is characterized by comprising the following steps:
acquiring digital waveform data of a signal; the digital waveform data is obtained by performing analog-to-digital conversion on the signal;
performing random number compensation on the numerical value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the numerical value of the data point;
performing digital gain configuration on each compensation value to obtain a plurality of configuration values in one-to-one correspondence;
intercepting each configuration value to respectively obtain a first value with the same number as the data point;
and displaying the waveform of the signal according to the first value.
2. The method of claim 1, wherein the randomly compensating the value of each data point in the digital waveform data to obtain a plurality of compensation values corresponding to the value of the data point comprises:
performing terminal bit expansion on the analog-to-digital conversion code corresponding to the numerical value of each data point in the digital waveform data according to a preset expansion bit number to obtain a plurality of random values formed after the terminal bit expansion;
performing first numerical value quantization processing on each random value according to the expansion bit number to obtain a plurality of compensation values corresponding to the numerical values of the data points; the first numerical quantization process is to divide each of the random numbers by a power of a first exponent of two, the first exponent being the number of the extension bits.
3. The method of claim 2, wherein the performing digital gain configuration on each compensation value to obtain a plurality of configuration values in a one-to-one correspondence includes:
and multiplying each compensation value by a preset multiplication coefficient respectively to perform digital gain configuration on each compensation value respectively, and obtaining a plurality of configuration values corresponding to each compensation value one to one according to a calculation result.
4. A precision adjustment method according to claim 3, wherein the setting process of the multiplication coefficient includes:
acquiring a theoretical coefficient and an actual coefficient of the variable gain amplifier, and acquiring the sum of the expansion bit number and the bit number of the analog-to-digital conversion code; the variable gain amplifier is used for amplifying and adjusting the signals so as to perform analog-to-digital conversion on the amplified and adjusted signals to obtain the digital waveform data;
performing second numerical value quantization processing according to a result of comparison between the actual coefficient and the theoretical coefficient, and calculating to obtain the multiplication coefficient; and the second numerical value quantization processing is to multiply the result of comparison between the actual coefficient and the theoretical coefficient by a second exponential power of two, wherein the second exponent is the sum of the expansion bit number and the bit number of the analog-to-digital conversion coding.
5. A method for adjusting accuracy as set forth in claim 3, wherein said truncating each of said configuration values to obtain a first value having the same number of bits as the value of said data point comprises:
rounding each configuration value to reserve a numerical value on an integer bit of the configuration value; and respectively obtaining a first value with the same digits as the numerical value of the data point according to the rounding processing result.
6. An accuracy adjustment method according to any one of claims 1 to 5, wherein said displaying a waveform of said signal in accordance with said first value further comprises:
sequentially setting a first configuration value corresponding to each line of display pixels in the waveform of the signal, and changing offset codes corresponding to a plurality of lines of display pixels in the waveform of the signal by using a plurality of first configuration values so as to perform offset display adjustment on the corresponding lines of display pixels according to the offset codes; the first configuration value is used for adjusting a corresponding row of display pixels in the waveform of the signal by one analog bias voltage signal, and the bias code is used for adjusting a corresponding row of display pixels in the waveform of the signal by a plurality of analog bias voltage signals;
when the currently set first configuration value is judged not to cause the change of the bias code, setting a second configuration value corresponding to a row of display pixels with adjustable first configuration value, and performing bias display compensation on the row of display pixels according to the second configuration value; the second configuration value is used for adjusting a corresponding row of display pixels in the waveform of the signal through a digital bias waveform;
and when the currently set first configuration value is judged to cause the change of the configuration code, carrying out offset display adjustment on the corresponding rows of display pixels according to the changed offset code, and resetting the second configuration value.
7. A digital oscilloscope, comprising:
the attenuation network is used for carrying out attenuation adjustment on the input signal so as to output a first adjustment signal;
the adjustable gain amplifier is used for amplifying and adjusting the first adjusting signal so as to output a second adjusting signal;
an analog-to-digital converter for performing analog-to-digital conversion on the second adjustment signal to output digital waveform data of the signal;
a controller connected with the analog-to-digital converter and used for performing precision adjustment on the digital waveform data according to the precision adjustment method of any one of claims 1 to 5 and controlling the waveform of the signal according to a first value obtained after precision adjustment;
and the display is used for displaying the waveform of the signal.
8. The digital oscilloscope of claim 7, further comprising a bias adjustment circuit, an impedance transformation network; the controller comprises a waveform processing unit and a central processing unit;
the central processing unit is connected with the bias adjusting circuit and the waveform processing unit, the central processing unit sequentially sets a first configuration value corresponding to each line of display pixels in the waveform of the signal, and changes bias codes corresponding to a plurality of lines of display pixels in the waveform of the signal by using a plurality of first configuration values; when the central processing unit judges that the currently set first configuration value does not cause the change of the bias code, setting a second configuration value corresponding to a row of display pixels with adjustable first configuration value, and sending the second configuration value to the waveform processing unit; when the central processing unit judges that the configuration code is changed due to the currently set first configuration value, carrying out offset display adjustment on the corresponding rows of display pixels according to the changed offset code, and resetting the second configuration value;
a digital-to-analog converter is arranged in the bias adjusting circuit and used for responding to the first configuration value to generate a plurality of analog bias voltage signals;
the impedance conversion network is connected with the attenuation network, the adjustable gain amplifier and the bias adjusting circuit, and is used for performing signal superposition on a first adjusting signal output by the attenuation network by using a plurality of analog bias voltage signals generated by the bias adjusting circuit to form a new first adjusting signal and inputting the new first adjusting signal to the adjustable gain amplifier, so that the adjustable gain amplifier performs amplification adjustment on the new first adjusting signal to form a new second adjusting signal, and the analog-to-digital converter performs analog-to-digital conversion on the new second adjusting signal and outputs new digital waveform data of the signal;
the waveform processing unit carries out precision adjustment on the new digital waveform data and outputs a new first value obtained after the precision adjustment; and the waveform processing unit is further used for carrying out offset display compensation on one or more rows of display pixels corresponding to the new first value according to the second configuration value, and forming the waveform of the signal according to the new first value and the one or more rows of display pixels subjected to offset display compensation.
9. The digital oscilloscope of claim 8, wherein said central processing unit is further connected to said adjustable gain amplifier for configuring the gain of said adjustable gain amplifier;
the central processing unit is further used for generating a configuration menu of the waveform of the signal and sending the configuration menu to the waveform processing unit, so that the waveform processing unit displays and superposes the configuration menu and the waveform of the signal to obtain display superposition data; the central processing unit is further configured to send the display overlay data to the display for display.
10. A computer-readable storage medium characterized by comprising a program executable by a processor to implement the accuracy adjustment method according to any one of claims 1 to 6.
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| CN112466259B (en) * | 2020-12-24 | 2021-11-23 | 深圳市鼎阳科技股份有限公司 | Gray scale compensation method and device of oscilloscope |
| CN114325025B (en) * | 2022-03-16 | 2022-06-21 | 深圳市鼎阳科技股份有限公司 | Display control device and method for digital oscilloscope and digital oscilloscope |
| CN114578112B (en) * | 2022-04-29 | 2022-07-15 | 深圳市鼎阳科技股份有限公司 | Attenuation temperature drift method for digital oscilloscope and digital oscilloscope |
| CN117194130B (en) * | 2023-11-03 | 2024-02-02 | 北京开源芯片研究院 | Method and device for displaying signal state information, electronic equipment and storage medium |
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