KR20230147468A - Calibration apparatus and method for analog digital converter - Google Patents

Abstract

The present invention relates to an error correction device and method for an analog-to-digital converter. The present invention relates to an error correction device and method for an analog-to-digital converter, which corrects the error of an analog-to-digital converter by mixing fixed coefficient correction and variation coefficient correction to complement and compensate for the shortcomings of variation coefficient correction and fixed coefficient correction. It improves accuracy, improves the control efficiency of devices equipped with analog-to-digital converters by selectively applying passive mode and active mode, allows gain and offset correction according to temperature range, and improves performance due to faster processing speed. There is.

Description

Error correction device and method for analog-to-digital converter {CALIBRATION APPARATUS AND METHOD FOR ANALOG DIGITAL CONVERTER}

The present invention relates to an error correction device and method for an analog-to-digital converter that corrects errors occurring in the process of converting an analog signal to a digital signal.

An analog digital converter (ADC) is a device that converts analog signals with continuous values into digital signals that express positive values.

Analog-to-digital converters are used in various fields such as home appliances such as TVs and refrigerators, as well as mobile communication terminals, computers, and automobiles.

These devices include sensors that detect temperature or humidity or voltage. The sensor outputs the measured signal as an analog signal, so in order to process it, it is necessary to convert the sensor's measured value into a digital signal. Accordingly, for devices equipped with sensors, the use of an analog-to-digital converter is essential.

Analog-to-digital converters have a problem in that errors (quantization errors) occur in the process of converting analog signals to digital signals.

The linear and static characteristics of an analog-to-digital converter (ADC) can be known through the offset and gain of the transfer function of the analog-to-digital converter (ADC). If an error occurs in these values from the ideal value, the measurement accuracy for the voltage source may be lowered and data processing using analog-to-digital conversion values may be affected.

Accordingly, in the related art, in order to correct errors, a fixed coefficient is corrected using factory calibration, or a variation coefficient is corrected using digital processing (software).

However, in the case of fixed coefficient correction, it is difficult to respond to changes in the characteristics of the analog-to-digital converter (ADC) due to temperature changes and performance changes, and in the case of variation coefficient correction, digital processing is required, which requires the application of software for this, making it more expensive to manufacture. There is a problem of cost.

Accordingly, a method is needed to correct errors in the analog-to-digital converter that fluctuate depending on changes in temperature and performance.

Related technology for analog-to-digital converters includes Republic of Korea Patent Publication No. 2021-0100438, ‘Analog-to-digital conversion device and analog-to-digital conversion method.’

Republic of Korea Patent No. 2021-0100438

The purpose of the present invention is to provide an error correction device and method for an analog-to-digital converter that corrects the error of the analog-to-digital converter by mixing fixed coefficient correction and variation coefficient correction.

In order to achieve the above object, the error correction device for an analog-to-digital converter according to the present invention is an error correction device for an analog-to-digital converter that compensates for the error of the conversion signal output from the analog-to-digital converter, the error correction device is a filter unit that filters the conversion signal output from the analog-to-digital converter; a first compensation unit that performs primary correction on the filtered signal using a fixed coefficient correction method and outputs a primary correction signal; and a second compensation unit that performs secondary correction on the primary correction signal using a coefficient of variation correction method. It includes, and the second compensation unit calculates the offset and gain for secondary correction using the difference between the pre-stored reference voltage and the real-time reference voltage measured in real time, and reflects the characteristics that change due to temperature or deterioration to compensate for the primary compensation. It is characterized by secondary correction of the correction signal.

The second compensation unit calculates a difference between the real-time reference voltage and the reference voltage, and when the difference is within a predetermined range, the second compensation unit outputs the first correction signal as an output signal without performing the second correction, and the difference If is outside a predetermined range, the secondary correction is performed.

The second compensation unit is characterized in that it performs the secondary correction by adding the first correction signal and the offset and amplifying the signal according to the gain.

The second compensation unit further includes a compensation value generator that calculates the offset and the gain, and the compensation value generator sets the offset according to a difference between the reference voltage and the real-time reference voltage.

The compensation value generator may calculate the gain in response to a difference between a reference gain calculated from the reference voltage and a real-time gain calculated from the real-time reference voltage.

The compensation value generator calculates the gain by subtracting the real-time gain from the reference gain, adding a constant when the compensation error rate is 0%, and then dividing by the constant.

The compensation value generator calculates the gain according to an approximate estimation method within a compensation error rate range of -5% to +5%.

The compensation value generator is characterized in that it performs compensation using the reference voltage that stores the internal voltage measured when the error rate of the analog-to-digital converter is minimum.

The error correction device is characterized in that it starts signal compensation when the analog-to-digital converter stops operating.

A correction method of an error correction device for an analog-to-digital converter according to the present invention includes the steps of converting an analog signal into a digital signal by an analog-to-digital converter and filtering the converted signal output; When the analog-to-digital converter stops operating, performing primary correction on the filtered conversion signal using a fixed coefficient correction method based on pre-stored data and outputting a primary correction signal; Performing secondary correction on the first correction signal using a coefficient of variation correction method and outputting a second correction signal; and outputting the corrected signal as an output signal; The step of outputting the secondary correction signal includes calculating an offset and gain for secondary correction using the difference between a pre-stored reference voltage and a real-time reference voltage measured in real time, thereby determining characteristics that change due to temperature or deterioration. It is characterized by secondary correction of the first correction signal by reflecting.

After outputting the first correction signal, the difference between the real-time reference voltage and the reference voltage is calculated, and if the difference is within a predetermined range, the first correction signal is output without performing the second correction. It is characterized in that it outputs a signal and performs the secondary correction if the difference is outside a predetermined range.

The step of outputting the secondary correction signal is characterized in that the secondary correction is performed by adding the first correction signal and the offset and amplifying the signal according to the gain.

Outputting the secondary correction signal may include setting the offset according to a difference between the reference voltage and the real-time reference voltage; calculating the gain in response to a difference between a reference gain calculated from the reference voltage and a real-time gain calculated from the real-time reference voltage; Includes.

The step of calculating the gain is characterized by adding a constant when the compensation error rate is 0% to the value obtained by subtracting the real-time gain from the reference gain and then dividing by the constant to calculate the gain.

The reference voltage is a stored value of the internal voltage measured when the error rate of the analog-to-digital converter is at a minimum, and the real-time reference voltage is measured periodically in real time during operation.

According to one aspect, the error correction device and method for an analog-to-digital converter of the present invention have the effect of improving correction accuracy by correcting errors of the analog-to-digital converter by mixing fixed coefficient correction and variation coefficient correction.

According to one aspect of the present invention, the shortcomings of variable coefficient correction and fixed coefficient correction are mutually compensated, the control efficiency of a device equipped with an analog-to-digital converter is improved by selectively applying passive mode and active mode, and the control efficiency of a device equipped with an analog-to-digital converter is improved according to the temperature section. Gain and offset correction are possible, and the processing speed is fast, which has the effect of improving performance.

Figure 1 is a block diagram showing the configuration of an error correction device connected to an analog-to-digital converter according to an embodiment of the present invention.
Figure 2 is a diagram illustrating the configuration of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.
FIG. 3 is a diagram referenced to explain a correction reference value of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.
Figure 4 is a flowchart showing a correction method of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.
Figure 5 is a diagram showing the error rate of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the attached drawings.

In this process, the thickness of lines or sizes of components shown in the drawing may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

Figure 1 is a block diagram showing the configuration of an error correction device connected to an analog-to-digital converter according to an embodiment of the present invention.

As shown in FIG. 1, the error correction device 50 for the analog-to-digital converter is connected to an analog-to-digital converter (ADC: Analog Digital Converter) 120.

The analog-to-digital converter (ADC) converts the analog signal input through the signal input unit 110 into a digital signal and outputs it.

The error correction device 50 receives the digital signal output from the analog-to-digital converter (ADC) 120, corrects the error (quantization error) that occurs in the process of converting the analog signal to a digital signal, and produces a corrected output signal. Prints (190).

The error correction device 50 is connected to the data unit 180 and stores data for signal compensation. In addition, the error correction device 50 is connected to the reference voltage measurement unit 160, receives the real-time reference voltage measured from the reference voltage measurement unit 160, and uses it for error compensation.

The error correction device 50 includes a filter 130, a first compensation unit 140, and a second compensation unit 150.

The filter 130 removes noise by filtering the digital signal output from the analog-to-digital converter (ADC) 120.

The first compensation unit 140 is connected to the filter 130 and corrects the filtered signal according to a fixed coefficient correction method with an offset and gain set according to factory correction based on the data stored in the data unit 180 (( S140).

The second compensator 150 performs secondary correction on the primary compensated signal output through the first compensator 140 and outputs an output signal 190. The second compensation unit 150 performs correction using the coefficient of variation correction method.

The second compensation unit 150 performs secondary correction of the signal using the reference voltage value measured by the reference voltage measurement unit 160 based on the data stored in the data unit 180.

The error correction device 50 can operate in either manual mode or automatic mode depending on settings.

When the manual mode is set, the error correction device 50 is controlled by input data from a system (not shown) in which the error correction device 50 is installed. The error correction device 50 controls the second compensation unit 150 according to system settings.

The error correction device 50 is controlled by the system to obtain a variable coefficient and turn variable calibration on and off in a calibration mode according to signal compensation.

Meanwhile, when the active mode is set, the error correction device 50 performs self-diagnosis of the analog-to-digital converter (ADC) 120, and when the accuracy of the variable coefficient deteriorates, the error correction device 50 determines the value of the variable coefficient. Perform measurement sequence.

Since the error correction device 50 does not calculate the coefficient of variation when accuracy is not degraded, time can be shortened.

The error correction device 50 performs internal diagnosis through reference voltage measurement when the analog-to-digital converter (ADC) 120 is in an inactive state.

The error correction device 50 obtains a variable coefficient when an error exceeding an allowable range occurs according to the diagnosis result of internal diagnosis.

Additionally, the error correction device 50 does not perform an operation to obtain a variable coefficient when the error is within an allowable range as a result of the diagnosis.

At this time, during internal diagnosis, the reference voltage is measured by the reference voltage measurement unit 160 and applied to the second compensation unit 150. The reference voltage measuring unit 160 periodically measures and stores the reference voltage.

Additionally, the data unit 180 stores data on offset, gain, and reference voltage, and provides the data to the first compensation unit 140 and the second compensation unit 150.

Figure 2 is a diagram illustrating the configuration of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.

As shown in FIG. 2, the error correction device 50 filters the converted signal through the filter 130, and converts the converted signal to an analog-to-digital converter (ADC) through the first compensation section 140 of the compensation section 60. The error in (120) is first corrected and secondly corrected through the second compensation unit (150). The compensation unit 60 includes a plurality of processors.

The error compensation device 50 waits for a certain period of time in the standby state, and when the analog-to-digital converter (ADC) 120 operates according to the command of the system, it maintains the standby state and the analog-to-digital converter (ADC) 120 operates. If not, measure the reference voltage and calculate the current error.

The error correction device 50 measures the coefficient of variation according to the error and obtains a calibration coefficient by repeatedly measuring the real-time reference voltage to correct the signal.

The first compensation unit 140 reduces errors by correcting the linear characteristics of the analog-to-digital converter (ADC) 120 using fixed coefficient correction.

The second compensation unit 150 reduces errors by correcting the linear characteristics of the analog-to-digital converter (ADC) 120 using variable coefficient correction.

The first compensation unit 140 reduces errors by correcting the linear characteristics of the analog-to-digital converter (ADC) 120 using fixed coefficient correction.

The first compensator 140 uses 2-point calibration to perform fixed coefficient correction. 2-point calibration is a method of calculating gain and offset error through two points above and below the transfer function.

The first compensation unit 140 receives the filtered signal containing the error, adds it to the offset data (Offsetcorr1) of the data unit 180, and amplifies it through the gain data (gaincorr1) of the data unit 180. Outputs the first corrected signal (cal.data).

The first compensation unit 140 measures the reference voltage of the internal power source during the manufacturing stage, calculates the voltage values of two points, and stores them in the data unit 180. The value of the first compensation unit 140 is set at the manufacturing stage and stored in the data unit 180.

The data unit 180 includes at least one of non-volatile memory such as Random Access Memory (RAM), ROM, Electrically Erased Programmable ROM (EEPROM), and flash memory.

The reference voltage is a measurement of the internal voltage when the analog-to-digital converter (ADC) 120 outputs the most accurate value. Calculate the error resulting from the conversion of the analog-to-digital converter by comparing it with the voltage when the error of the analog-to-digital converter is minimum.

The second compensation unit 150 reduces errors by correcting the linear characteristics of the analog-to-digital converter (ADC) 120 using variable coefficient correction.

The second compensation unit 140 receives the first corrected signal from the first compensation unit 140, adds it to the offset data (Offsetcorr1) of the data unit 180, and then calculates the error of the signal through the gain data (gaincorr1). Correct.

The second compensator 150 uses 2-point calibration in variable coefficient correction.

The second compensation unit 150 inputs the reference voltages (vref_mem_3/4, vref_mem_1/4) stored in the data unit 180 and the real-time reference voltages (vref_op_3/4, vref_op_1/4) from the reference voltage measurement unit 160. It includes a compensation value generator 153 that calculates the current state error, measures the coefficient of variation according to the error, and obtains a calibration coefficient by repeatedly measuring the reference voltage.

The second compensation unit 150 receives the first corrected signal, adds the offset data (Offsetcorr2) output from the compensation value generator 153 and the first corrected signal in the adder 151, and The gain (gaincorr2) output from (153) is applied and amplified in the amplifier (152) to perform secondary correction of the signal.

Accordingly, the second compensation unit 150 outputs the secondary corrected signal as the output signal 190.

The compensation value generation unit 153 uses the reference voltage stored in the data unit 180 and the real-time reference voltage periodically measured and stored by the reference voltage measurement unit 160 to calculate the gain that changes due to temperature or deterioration. Calculate the offset value.

The compensation value generator 153 calculates gain and offset data, which are compensation coefficients, using Equation 1 below.

The reference gain is a value set at the manufacturing stage, and the real time gain is a value calculated based on the value measured during operation. H is a constant, 16’h8000, which means the middle value that becomes the standard when calculating the hexa value based on 16 bits. If the reference gain and the real-time gain are the same, the value becomes 0, so the gain (gaincorr2) becomes 0 regardless of H.

The compensation value generator 153 uses an approximate value estimation method to calculate a gain (real-time gain) as an approximate value for an error of -5% to -5%.

FIG. 3 is a diagram referenced to explain a correction reference value of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.

As shown in (a) of FIG. 3, the first compensation unit 140 sends the fixed correction coefficient and reference voltage calculated through factory calibration in the manufacturing stage to the data unit 180. After storage, when the operation of the analog-to-digital converter (ADC) 120 is stopped, the error of the converted signal is first corrected using the previously stored data.

The first compensation unit 140 uses external power sources of 25% and 75% of the total size, calculates gain and offset data using the calculated values, and uses the reference voltage of the internal power as a criterion for determining offset and gain. Set it and store it in the data unit 180.

The first compensation unit 140 is designed to first compensate the converted signal (S1) by applying the obtained gain and offset data and output an ideal signal (S2) accordingly.

As shown in (b) of FIG. 3, even if the second compensator 150 compensates for the signal through the first compensator 140, the analog-to-digital converter (ADC) (ADC) ( 120) corrects errors that occur due to changes in output.

When the signal output from the analog-to-digital converter 120 is corrected by the first compensation unit 140, the second compensation unit 150 performs secondary signal compensation on the primary correction signal S2, Outputs a difference correction signal (S2).

The second compensation unit 150 repeatedly measures a real-time reference voltage in addition to the previously stored reference voltage, calculates an error, and generates a compensation value accordingly.

The second compensation unit 150 performs secondary correction using the latest variable coefficient calculated through the compensation value generator 153. The coefficient of variation is generated based on a real-time reference voltage measured periodically and includes offset data and gain.

Therefore, the second compensator 150 can complement the fixed coefficient correction of the first compensator 140 that changes depending on temperature/deterioration, etc.

When the reference gain generated during the manufacturing process changes, when the ideal reference gain has an error rate of 0%, the hexa value is 0x8000, and when the error rate of the reference gain is +5%, the hexa value is 0x8666. , If the error rate of the reference gain is -5%, the hexadecimal value is 0x7999. 0x8000 is the slope value for the ideal reference gain. Assuming that there is a temperature change of ±5% based on the reference gain, a change in real-time gain occurs.

Meanwhile, since the real time gain changes during operation due to causes such as temperature or deterioration, the second compensation unit 150 performs secondary compensation by taking this change into consideration.

Figure 4 is a flowchart showing a correction method of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.

As shown in FIG. 4, the error correction device 50 stands by when the analog-to-digital converter (ADC) 120 is operating (S310). When the analog-to-digital converter (ADC) 120 stops operating (S320), error compensation for the analog-to-digital converter (ADC) 120 begins.

The first compensation unit 140 reads the data, offset data, and gain stored in the data unit 180, and first compensates for the error of the converted signal using fixed coefficient correction (S340).

The second compensation unit 150, which receives the first compensated signal, receives the real-time reference voltage measured in real time through the reference voltage measurement unit 160 (S350).

The compensation value generator 153 compares the measured reference voltage with the reference voltage stored in the data section 180 and calculates an error.

The compensation value generator 153 determines whether the error is within the allowable range (S360), and if it is within the allowable range, it does not perform secondary compensation and outputs the first compensated signal as the output signal 190.

Meanwhile, when the error is outside the allowable range, the compensation value generator 153 generates offset data and gain based on the reference voltage stored in the data unit 180 and the real-time reference voltage. Calculate the compensation value including (S370).

The compensation value generator 153 calculates the difference (reference gain) between the reference voltages stored in the data section 180, calculates the difference (real-time gain) between the measured reference voltages, and then subtracts the real-time gain from the reference gain. , the value is multiplied by the slope for the ideal compensation value, and the value calculated is divided by the slope for the ideal compensation value to calculate the gain of the secondary compensation. Additionally, the offset of the secondary compensation is set as the difference between the reference voltage stored in the data unit 180 and the measured reference voltage.

The second compensation unit 150 secondly compensates the first compensated signal based on the offset data and gain applied from the compensation value generator 153 (S380).

The second compensation unit 150 outputs the secondary compensated signal as an output signal (S390).

Figure 5 is a diagram showing the error rate of an error correction device for an analog-to-digital converter according to an embodiment of the present invention.

As shown in FIG. 5, the correction error rate of the real-time gain changes according to the error change rate of the reference gain.

The first curve (RG1) is the correction error rate of the real-time gain generated when the correction error rate of the reference gain is -5%, and the second curve (RG2) is the correction error rate of the real-time gain generated when the reference gain correction error rate is 0%. , and the third curve RG3 is the correction error rate of the real-time gain generated when the correction error rate of the reference gain is +5%.

Assuming that the reference gain is -5% (0x7999) and the real time gain changes from -5% (0x7384) to +5% (0x7FAD), the second compensation unit 150 It can be seen that the correction error rate according to real-time gain is determined at -0.5% to +0.1% as the signal is secondaryly compensated.

Assuming that the reference gain is 0% (0x8000) and the real-time gain changes from -5% (0x7999) to +5% (0x8666), the signal is secondaryly compensated through the second compensation unit 150. As a result, it can be seen that the correction error rate according to real-time gain is determined at -0.3% to +0.0%.

In addition, assuming that the reference gain is +5% (0x8666) and the real-time gain changes from -5% (0x7FAD) to +5% (0x8D1E), the signal is secondaryly compensated through the second compensation unit 150. Accordingly, it can be seen that the correction error rate according to real-time gain is determined from -0.3% to +0%.

Accordingly, the present invention performs fixed coefficient correction and variation coefficient correction through the first compensation unit 140 and the second compensation unit 150 in consideration of changes occurring due to temperature or deterioration, so that the converted signal It can compensate for errors, greatly reduce the compensation error rate, and correct the conversion error of the analog-to-digital converter while minimizing the size of the circuit configuration of the compensation device.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely illustrative, and those skilled in the art will recognize that various modifications and other equivalent embodiments can be made therefrom. You will understand. Therefore, the true technical protection scope of the present invention should be determined by the scope of the patent claims below.

50: Error correction device
110: signal input unit 120: analog digital converter (ADC)
130: Filter 140: First compensation unit
150: second compensation unit 153: compensation value generation unit
160: Reference voltage measurement unit 180: Data unit
190: Output signal

Claims (15)

In the error correction device for an analog-to-digital converter, which compensates for the error of the conversion signal output from the analog-to-digital converter,
The error correction device includes a filter unit that filters the conversion signal output from the analog-to-digital converter;
a first compensation unit that performs primary correction on the filtered signal using a fixed coefficient correction method and outputs a primary correction signal; and
a second compensation unit that performs secondary correction on the first correction signal using a coefficient of variation correction method; Including,
The second compensation unit calculates the offset and gain for secondary correction using the difference between the pre-stored reference voltage and the real-time measured real-time reference voltage, and reflects the characteristics that change due to temperature or deterioration and converts the first correction signal to 2. An error correction device for an analog-to-digital converter characterized by difference correction. According to claim 1,
The second compensation unit calculates a difference between the real-time reference voltage and the reference voltage, and when the difference is within a predetermined range, the second compensation unit outputs the first correction signal as an output signal without performing the second correction,
An error correction device for an analog-to-digital converter, characterized in that the secondary correction is performed when the difference is outside a predetermined range. According to claim 1,
The second compensation unit adds the first correction signal and the offset and amplifies the signal according to the gain to perform the second correction. According to claim 3,
The second compensation unit further includes a compensation value generator that calculates the offset and gain,
The compensation value generator sets the offset according to the difference between the reference voltage and the real-time reference voltage. According to claim 4,
The compensation value generator calculates the gain in response to a difference between a reference gain calculated from the reference voltage and a real-time gain calculated from the real-time reference voltage. According to claim 5,
The compensation value generator calculates the gain by adding a constant when the compensation error rate is 0% to the value obtained by subtracting the real-time gain from the reference gain, and then dividing by the constant. An error correction device for an analog-to-digital converter. . According to claim 5,
An error correction device for an analog-to-digital converter, wherein the compensation value generator calculates the gain according to an approximate estimation method within a compensation error rate range of -5% to +5%. According to claim 4,
The compensation value generator performs compensation using the reference voltage that stores the internal voltage measured when the error rate of the analog-to-digital converter is minimum. According to claim 1,
The error correction device for an analog-to-digital converter is characterized in that the error correction device starts signal compensation when the analog-to-digital converter stops operating. An analog-to-digital converter converts an analog signal into a digital signal and filters the output converted signal;
When the analog-to-digital converter stops operating, performing primary correction on the filtered conversion signal using a fixed coefficient correction method based on pre-stored data and outputting a primary correction signal;
Performing secondary correction on the first correction signal using a coefficient of variation correction method and outputting a second correction signal; and
Outputting the corrected signal as an output signal; Including,
The step of outputting the secondary correction signal is,
The difference between the pre-stored reference voltage and the real-time measured real-time reference voltage is used to calculate the offset and gain for secondary correction, thereby performing secondary correction of the primary correction signal by reflecting characteristics that change due to temperature or deterioration. Correction method of error correction device for analog-to-digital converter. According to claim 10,
After outputting the first correction signal,
Calculate the difference between the real-time reference voltage and the reference voltage, and if the difference is within a predetermined range, output the first correction signal as the output signal without performing the second correction,
A correction method of an error correction device for an analog-to-digital converter, characterized in that the secondary correction is performed when the difference is outside a predetermined range. According to claim 10,
The step of outputting the secondary correction signal is,
A correction method of an error correction device for an analog-to-digital converter, characterized in that the second correction is performed by adding the first correction signal and the offset and amplifying the signal according to the gain. According to claim 10,
The step of outputting the secondary correction signal is,
setting the offset according to the difference between the reference voltage and the real-time reference voltage; and
calculating the gain in response to a difference between a reference gain calculated from the reference voltage and a real-time gain calculated from the real-time reference voltage; A correction method of an error correction device for an analog-to-digital converter including. According to claim 13,
The step of calculating the gain is,
A correction method of an error correction device for an analog-to-digital converter, characterized in that the gain is calculated by adding a constant when the compensation error rate is 0% to the value obtained by subtracting the real-time gain from the reference gain, and then dividing by the constant. According to claim 13,
The reference voltage is a value storing the internal voltage measured when the error rate of the analog-to-digital converter is minimum,
A correction method for an error correction device for an analog-to-digital converter, wherein the real-time reference voltage is measured periodically in real-time during operation.

Images