Digital calibration system and method for time-interleaved analog-to-digital converter

Abstract

The invention provides a digital calibration system and method for a time-interleaved analog-to-digital converter, and belongs to the technical field of digital circuits, and the system comprises an analog-to-digital converter module which is used for receiving an input calibration signal and obtaining a plurality of analog-to-digital converter data based on the calibration signal; the plurality of analog-to-digital converter data are voltage and current of the analog-to-digital converters, the power calculation module is used for obtaining power corresponding to the plurality of analog-to-digital converters based on the plurality of analog-to-digital converter data, the accumulator is used for obtaining average power of the plurality of analog-to-digital converters based on the power corresponding to the plurality of analog-to-digital converters, and the judgment module is used for judging the average power of the plurality of analog-to-digital converters. The analog-to-digital converter module is used for obtaining a judgment result based on the power corresponding to the analog-to-digital converters and the average power of the analog-to-digital converters, and the calibration module is used for carrying out dynamic calibration operation on the analog-to-digital converter module based on the judgment result. According to the invention, the technical problem of low digital calibration precision of the analog-to-digital converter in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of digital circuits, and in particular to a digital calibration system and method for a time-interleaved analog-to-digital converter. Background Art

[0002] In order to increase the sampling rate of the analog-to-digital converter, a time-interleaved analog-to-digital converter structure is used. The basic principle is to use multiple analog-to-digital converters to work in an interleaved manner within a clock cycle to meet higher rate requirements. However, this method will also introduce mismatch errors, resulting in the collected data not being correctly recognized by the digital circuit.

[0003] The prior art uses an analog circuit method for calibration, which has low accuracy. Alternatively, the data signal processing technology is directly used for data recovery without calibration. These two methods limit the maximum operating frequency of the time-interleaved analog-to-digital converter. Therefore, the prior art has a technical problem of low digital calibration accuracy for the analog-to-digital converter. Summary of the invention

[0004] In view of this, it is necessary to provide a digital calibration system and method for a time-interleaved analog-to-digital converter to solve the technical problem of low digital calibration accuracy of the analog-to-digital converter in the prior art.

[0005] In order to solve the above technical problems, on the one hand, the present invention provides a digital calibration system for a time-interleaved analog-to-digital converter, comprising: The analog-to-digital converter module is used to receive an input calibration signal and obtain a plurality of analog-to-digital converter data based on the calibration signal; the plurality of analog-to-digital converter data are: a voltage and a current of the analog-to-digital converter; A power calculation module, which is in communication with the analog-to-digital converter module and is used to obtain the power corresponding to the multiple analog-to-digital converters based on the multiple analog-to-digital converter data; an accumulator, connected in communication with the power calculation module, and configured to obtain an average power of the plurality of analog-to-digital converters based on the powers corresponding to the plurality of analog-to-digital converters; A decision module, connected in communication with the accumulator, for obtaining a decision result based on the powers corresponding to the multiple analog-to-digital converters and the average powers of the multiple analog-to-digital converters; The calibration module is connected to the decision module for dynamically calibrating the analog-to-digital converter module based on the decision result.

[0006] In a possible implementation, obtaining the average power of the plurality of analog-to-digital converters based on the powers corresponding to the plurality of analog-to-digital converters includes: Based on the weighted accumulation of the powers corresponding to the multiple analog-to-digital converters, approximate powers of the multiple analog-to-digital converters are obtained, and based on the approximate powers of the multiple analog-to-digital converters, average powers of the multiple analog-to-digital converters are obtained.

[0007] In a possible implementation, obtaining the average power of the plurality of analog-to-digital converters based on the approximate powers of the plurality of analog-to-digital converters includes: A displacement calculation is performed based on the approximate powers of the plurality of analog-to-digital converters to obtain an average power of the plurality of analog-to-digital converters.

[0008] In a possible implementation, obtaining a determination result based on powers corresponding to the multiple analog-to-digital converters and average powers of the multiple analog-to-digital converters includes: A judgment result is obtained based on a comparison between the powers corresponding to the multiple analog-to-digital converters and the average powers of the multiple analog-to-digital converters.

[0009] In a possible implementation, the comparing the powers corresponding to the multiple analog-to-digital converters with the average powers of the multiple analog-to-digital converters to obtain the judgment result includes: The power corresponding to the multiple analog-to-digital converters is compared with the average power of the multiple analog-to-digital converters to obtain the power difference corresponding to the multiple analog-to-digital converters, and the judgment result is obtained based on the power difference corresponding to the multiple analog-to-digital converters.

[0010] In a possible implementation, obtaining a decision result based on power differences corresponding to a plurality of analog-to-digital converters includes: The power difference values ​​corresponding to the multiple analog-to-digital converters are matched with a preset threshold value to obtain a judgment result.

[0011] In a possible implementation, the dynamically calibrating the analog-to-digital converter module based on the judgment result includes: A dynamic calibration operation is performed on each analog-to-digital converter in the analog-to-digital converter module based on the judgment result.

[0012] In a possible implementation, the dynamically calibrating each analog-to-digital converter in the analog-to-digital converter module based on the judgment result includes: The output gain of each analog-to-digital converter in the analog-to-digital converter module is dynamically calibrated based on the decision result.

[0013] In a possible implementation, the dynamic calibration operation includes: Controls the gain configuration register and adjusts the step size of the analog-to-digital converter module.

[0014] On the other hand, the present invention also provides a digital calibration method for a time-interleaved analog-to-digital converter, comprising: The analog-to-digital converter module receives an input calibration signal, and obtains a plurality of analog-to-digital converter data based on the calibration signal; the plurality of analog-to-digital converter data are: a voltage and a current of the analog-to-digital converter; Based on the data of the multiple analog-to-digital converters, the power corresponding to the multiple analog-to-digital converters is obtained through a power calculation module; Based on the powers corresponding to the multiple analog-to-digital converters, an average power of the multiple analog-to-digital converters is obtained through an accumulator; A decision result is obtained through a decision module based on the power corresponding to the multiple analog-to-digital converters and the average power of the multiple analog-to-digital converters; The calibration module dynamically calibrates the analog-to-digital conversion module based on the judgment result.

[0015] The beneficial effects of the present invention are as follows: the digital calibration system of the time-interleaved analog-to-digital converter provided by the present invention comprises: an analog-to-digital converter module, which is used to receive an input calibration signal and obtain multiple analog-to-digital converter data based on the calibration signal; the multiple analog-to-digital converter data are: the voltage and current of the analog-to-digital converter; a power calculation module, which is connected to the analog-to-digital converter module in communication, and is used to obtain the power corresponding to the multiple analog-to-digital converters based on the multiple analog-to-digital converter data, and the purpose of doing so is to obtain the power corresponding to the multiple analog-to-digital converters based on the multiple analog-to-digital converter data; an accumulator, which is connected to the power calculation module in communication, and is used to obtain the power corresponding to the multiple analog-to-digital converters based on the power corresponding to the multiple analog-to-digital converters. The purpose of this is to accumulate the powers corresponding to multiple analog-to-digital converters to obtain the average powers of multiple analog-to-digital converters; the judgment module is communicated with the accumulator and is used to obtain a judgment result based on the powers corresponding to multiple analog-to-digital converters and the average powers of multiple analog-to-digital converters. The purpose of this is to perform coarse calibration; the calibration module is communicated with the judgment module and is used to perform dynamic calibration operation on the analog-to-digital converter module based on the judgment result. The purpose of this is to perform fine calibration. The present invention performs calibration through two steps of coarse calibration and fine calibration, thereby improving the calibration speed and accuracy so as to enable dynamic calibration and adapt to new errors caused by temperature changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention; Figure 2 A principle block diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention; Figure 3A power calculation principle diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention; Figure 4 A power comparison diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention; Figure 5 A comparison diagram of fine calibration of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention; Figure 6 A schematic flow chart of an embodiment of a digital calibration method for a time-interleaved analog-to-digital converter provided by the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0020] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or equipment.

[0021] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The present invention provides a digital calibration system and method for a time-interleaved analog-to-digital converter, which are described below respectively.

[0024] Figure 1 A schematic diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention and Figure 2 A principle block diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention includes: The analog-to-digital converter module 101 is used to receive an input calibration signal and obtain a plurality of analog-to-digital converter data based on the calibration signal; the plurality of analog-to-digital converter data are: a voltage and a current of the analog-to-digital converter; The power calculation module 102 is in communication with the analog-to-digital converter module 101 and is used to obtain the power corresponding to the multiple analog-to-digital converters based on the multiple analog-to-digital converter data power calculation module 102; The accumulator 103 is in communication with the power calculation module 102 and is used to obtain the average power of the multiple analog-to-digital converters based on the power accumulators 103 corresponding to the multiple analog-to-digital converters; A decision module 104, which is in communication with the accumulator 103, and is used to obtain a decision result based on the powers corresponding to the multiple analog-to-digital converters and the average power of the multiple analog-to-digital converters; The calibration module 105 is in communication with the decision module 104 and is used to perform a dynamic calibration operation on the analog-to-digital converter module 101 based on the decision result.

[0025] It is understandable that when the time-interleaved analog-to-digital converter structure is used, the degree of device mismatch between different converters is inconsistent, which will cause clock drift and gain error, affecting the accuracy of data acquisition.

[0026] Digital circuits are used to calibrate multiple groups of analog-to-digital converters, and the errors between different converters are adjusted to within 1dB, thereby improving the sampling accuracy.

[0027] It can be further understood that the present invention is mainly composed of digital circuits, and uses a digital signal processing method to calculate the power of each analog-to-digital converter and the average power, and based on the calculated average power and the power ratio of each analog-to-digital converter, as shown in FIG. Figure 2 As shown, the digital circuit performs weighted accumulation on the data of each converter channel to obtain the approximate converter power, then shifts the power information to obtain the average power, and finally compares the average power with the channel power to obtain the judgment result. The output gain of each analog-to-digital converter is dynamically adjusted according to the judgment result to reduce the error.

[0028] In some embodiments of the present invention, obtaining the average power of the multiple analog-to-digital converters based on the power accumulators 103 corresponding to the multiple analog-to-digital converters includes: The power accumulator 103 corresponding to the multiple analog-to-digital converters performs weighted accumulation to obtain approximate powers of the multiple analog-to-digital converters, and based on the approximate powers of the multiple analog-to-digital converters, the average power of the multiple analog-to-digital converters is obtained.

[0029] It is understandable that when the time-interleaved analog-to-digital converter structure is used, the degree of device mismatch between different converters is inconsistent, which will cause clock drift and gain error, affecting the accuracy of data acquisition.

[0030] Digital circuits are used to calibrate multiple groups of analog-to-digital converters, and the errors between different converters are adjusted to within 1dB, thereby improving the sampling accuracy.

[0031] It can be further understood that the present invention is mainly composed of digital circuits, and uses digital signal processing methods to calculate the power and average power of each analog-to-digital converter. According to the ratio of the calculated average power to the power of each analog-to-digital converter, the digital circuit performs weighted accumulation on the data of each converter channel to obtain an approximate converter power, and then shifts the power information to obtain the average power. Finally, the average power is compared with the channel power to obtain a judgment result, and the output gain of each analog-to-digital converter is dynamically adjusted according to the judgment result to reduce the error.

[0032] Figure 3 A power calculation schematic diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention includes: A displacement calculation is performed based on the approximate powers of the plurality of analog-to-digital converters to obtain an average power of the plurality of analog-to-digital converters.

[0033] It can be understood that multiple analog-to-digital converters sample normally and send data to the digital circuit; the digital circuit calculates the actual power of each analog-to-digital converter based on the size of the data. The power calculation method is as follows. The converter has multiple bits of quantized data. The larger the data, the higher the output power of the converter. Weighted operations on data of different bits can obtain the approximate power of the converter. This method has lower overhead than directly squaring the multiplier; the average power of all analog-to-digital converters is calculated based on the power of each analog-to-digital converter; coarse calibration is started, the average power is compared with the power of each analog-to-digital converter, and then a vote is performed to obtain the difference between the power of different converters and the average power. Two judgments of greater than the average and less than the average are obtained based on the difference. The judgment result is written into the gain configuration register through a 1-bit signal to control the gain of the converter for calibration to obtain multiple sets of converter outputs without mismatch.

[0034] Figure 4 A power comparison diagram of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention includes: The powers corresponding to the multiple analog-to-digital converters and the average powers of the multiple analog-to-digital converters are compared by the decision module 104 to obtain a decision result.

[0035] It can be understood that multiple analog-to-digital converters sample normally and send data to the digital circuit; the digital circuit calculates the actual power of each analog-to-digital converter based on the size of the data. The power calculation method is as follows. The converter has multiple bits of quantized data. The larger the data, the higher the output power of the converter. Weighted operations on data of different bits can obtain the approximate power of the converter. This method has lower overhead than directly squaring the multiplier; the average power of all analog-to-digital converters is calculated based on the power of each analog-to-digital converter; coarse calibration is started, the average power is compared with the power of each analog-to-digital converter, and then a vote is performed to obtain the difference between the power of different converters and the average power. Two judgments of greater than the average and less than the average are obtained based on interpolation. The judgment result is written into the gain configuration register through a 1-bit signal to control the gain of the converter for calibration to obtain multiple sets of converter outputs without mismatch; the power comparison process is as follows Figure 4 As shown, the length of each calibration cycle can be adjusted.

[0036] In some embodiments of the present invention, a judgment result is obtained based on comparing the powers corresponding to the multiple analog-to-digital converters with the average powers of the multiple analog-to-digital converters, including: The power corresponding to the multiple analog-to-digital converters is compared with the average power of the multiple analog-to-digital converters to obtain the power difference corresponding to the multiple analog-to-digital converters, and the judgment result is obtained based on the power difference corresponding to the multiple analog-to-digital converters.

[0037] It can be understood that the system is mainly composed of digital circuits, and uses digital signal processing methods to calculate the power and average power of each analog-to-digital converter. According to the ratio of the calculated average power to the power of each analog-to-digital converter, the digital circuit performs weighted accumulation on the data of each converter channel to obtain the approximate converter power, and then shifts the power information to obtain the average power. Finally, the average power is compared with the channel power to obtain the judgment result. The output gain of each analog-to-digital converter is dynamically adjusted according to the judgment result to reduce the error.

[0038] In some embodiments of the present invention, a decision result is obtained based on power differences corresponding to a plurality of analog-to-digital converters, including: The power difference values ​​corresponding to the multiple analog-to-digital converters are matched with a preset threshold value to obtain a judgment result.

[0039] It can be understood that the system is mainly composed of digital circuits, and uses digital signal processing methods to calculate the power and average power of each analog-to-digital converter. According to the ratio of the calculated average power to the power of each analog-to-digital converter, the digital circuit performs weighted accumulation on the data of each converter channel to obtain the approximate converter power, and then shifts the power information to obtain the average power. Finally, the average power is compared with the channel power to obtain the judgment result. The output gain of each analog-to-digital converter is dynamically adjusted according to the judgment result to reduce the error.

[0040] In some embodiments of the present invention, a dynamic calibration operation is performed on the analog-to-digital converter module 101 based on the judgment result, including: A dynamic calibration operation is performed on each analog-to-digital converter in the analog-to-digital converter module 101 based on the determination result.

[0041] It can be understood that the system is mainly composed of digital circuits, and uses digital signal processing methods to calculate the power and average power of each analog-to-digital converter. According to the ratio of the calculated average power to the power of each analog-to-digital converter, the digital circuit performs weighted accumulation on the data of each converter channel to obtain the approximate converter power, and then shifts the power information to obtain the average power. Finally, the average power is compared with the channel power to obtain the judgment result. The output gain of each analog-to-digital converter is dynamically adjusted according to the judgment result to reduce the error.

[0042] Figure 5 A comparison diagram of fine calibration of an embodiment of a digital calibration system for a time-interleaved analog-to-digital converter provided by the present invention includes: The output gain of each analog-to-digital converter in the analog-to-digital converter module 101 is dynamically calibrated based on the determination result.

[0043] It is understandable that after several cycles, when the power and the average power are stable, the calibration module 105 is roughly locked, and the calibration accuracy is improved to perform fine calibration on each analog-to-digital converter. During fine calibration, the average power change is much smaller than the change of a single analog-to-digital converter, so dynamic real-time calibration can be performed without being affected by the delay of the analog-to-digital converter gain adjustment, such as Figure 5 shown.

[0044] It can be further understood that the calibration step size is adjusted, and the gain control register is increased by 10 at a time for coarse calibration and by 1 at a time for fine calibration, so as to increase the calibration speed.

[0045] In some embodiments of the present invention, the dynamic calibration operation includes: Controls the gain configuration register and adjusts the step size of the analog-to-digital converter module 101 .

[0046] It can be understood that the system is mainly composed of digital circuits, and uses digital signal processing methods to calculate the power and average power of each analog-to-digital converter. According to the ratio of the calculated average power to the power of each analog-to-digital converter, the digital circuit performs weighted accumulation on the data of each converter channel to obtain the approximate converter power, and then shifts the power information to obtain the average power. Finally, the average power is compared with the channel power to obtain the judgment result. The output gain of each analog-to-digital converter is dynamically adjusted according to the judgment result to reduce the error.

[0047] It can be further understood that the present invention adopts a digital circuit and algorithm to implement a calibration architecture; a multi-step calibration algorithm and principle, which performs calibration through two steps of coarse calibration and fine calibration to improve calibration speed and accuracy; dynamic calibration, in which the time is long and the step size is small under fine calibration, and calibration can be performed while normal operation is in progress, and can cope with subtle gain changes caused by real-time temperature and environmental changes.

[0048] Figure 6 A flow chart of an embodiment of a digital calibration method for a time-interleaved analog-to-digital converter provided by the present invention includes: S601, receiving an input calibration signal through an analog-to-digital converter module, and acquiring a plurality of analog-to-digital converter data based on the calibration signal; the plurality of analog-to-digital converter data are: a voltage and a current of the analog-to-digital converter; S602, obtaining powers corresponding to the multiple analog-to-digital converters through a power calculation module based on the data of the multiple analog-to-digital converters; S603, obtaining average powers of the multiple analog-to-digital converters through an accumulator based on powers corresponding to the multiple analog-to-digital converters; S604, obtaining a decision result through a decision module based on the powers corresponding to the multiple analog-to-digital converters and the average powers of the multiple analog-to-digital converters; S605 , dynamically calibrating the analog-to-digital conversion module based on the judgment result through the calibration module.

[0049] The digital calibration system and method for the time-interleaved analog-to-digital converter provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A digital calibration system for a time-interleaved analog-to-digital converter, characterized in that: include: An analog-to-digital converter module, configured to receive an input calibration signal and obtain a plurality of analog-to-digital converter data based on the calibration signal; The multiple analog-to-digital converter data are: voltage and current of the analog-to-digital converter; A power calculation module, which is in communication with the analog-to-digital converter module and is used to obtain the power corresponding to the multiple analog-to-digital converters based on the multiple analog-to-digital converter data; an accumulator, connected in communication with the power calculation module, and configured to obtain an average power of the plurality of analog-to-digital converters based on the powers corresponding to the plurality of analog-to-digital converters; A decision module, connected in communication with the accumulator, for obtaining a decision result based on the powers corresponding to the multiple analog-to-digital converters and the average powers of the multiple analog-to-digital converters; The calibration module is connected to the decision module for dynamically calibrating the analog-to-digital converter module based on the decision result.

2. The digital calibration system for a time-interleaved analog-to-digital converter according to claim 1, characterized in that: The step of obtaining the average power of the plurality of analog-to-digital converters based on the powers corresponding to the plurality of analog-to-digital converters comprises: Based on the weighted accumulation of the powers corresponding to the multiple analog-to-digital converters, approximate powers of the multiple analog-to-digital converters are obtained, and based on the approximate powers of the multiple analog-to-digital converters, average powers of the multiple analog-to-digital converters are obtained.

3. The digital calibration system of a time-interleaved analog-to-digital converter according to claim 2, characterized in that: The method of obtaining the average power of the plurality of analog-to-digital converters based on the approximate power of the plurality of analog-to-digital converters comprises: A displacement calculation is performed based on the approximate powers of the plurality of analog-to-digital converters to obtain an average power of the plurality of analog-to-digital converters.

4. The digital calibration system for a time-interleaved analog-to-digital converter according to claim 1, characterized in that: The determining result is obtained based on the power corresponding to the multiple analog-to-digital converters and the average power of the multiple analog-to-digital converters, including: A judgment result is obtained based on a comparison between the powers corresponding to the multiple analog-to-digital converters and the average powers of the multiple analog-to-digital converters.

5. The digital calibration system for a time-interleaved analog-to-digital converter according to claim 4, characterized in that: The comparing the powers corresponding to the multiple analog-to-digital converters with the average powers of the multiple analog-to-digital converters to obtain a judgment result includes: The power corresponding to the multiple analog-to-digital converters is compared with the average power of the multiple analog-to-digital converters to obtain the power difference corresponding to the multiple analog-to-digital converters, and the judgment result is obtained based on the power difference corresponding to the multiple analog-to-digital converters.

6. The digital calibration system of a time-interleaved analog-to-digital converter according to claim 5, characterized in that: The determining result based on the power difference values ​​corresponding to the multiple analog-to-digital converters includes: The power difference values ​​corresponding to the multiple analog-to-digital converters are matched with a preset threshold value to obtain a judgment result.

7. The digital calibration system for a time-interleaved analog-to-digital converter according to claim 1, characterized in that: The dynamically calibrating the analog-to-digital converter module based on the judgment result includes: A dynamic calibration operation is performed on each analog-to-digital converter in the analog-to-digital converter module based on the judgment result.

8. The digital calibration system for a time-interleaved analog-to-digital converter according to claim 7, characterized in that: The dynamically calibrating each analog-to-digital converter in the analog-to-digital converter module based on the judgment result includes: The output gain of each analog-to-digital converter in the analog-to-digital converter module is dynamically calibrated based on the decision result.

9. The digital calibration system of a time-interleaved analog-to-digital converter according to claim 8, characterized in that: The dynamic calibration operation comprises: Controls the gain configuration register and adjusts the step size of the analog-to-digital converter module.

10. A digital calibration method for a time-interleaved analog-to-digital converter, characterized in that: include: receiving an input calibration signal through an analog-to-digital converter module, and acquiring a plurality of analog-to-digital converter data based on the calibration signal; The multiple analog-to-digital converter data are: voltage and current of the analog-to-digital converter; Based on the data of the multiple analog-to-digital converters, the power corresponding to the multiple analog-to-digital converters is obtained through a power calculation module; Based on the powers corresponding to the multiple analog-to-digital converters, an average power of the multiple analog-to-digital converters is obtained through an accumulator; A decision result is obtained through a decision module based on the power corresponding to the multiple analog-to-digital converters and the average power of the multiple analog-to-digital converters; The calibration module dynamically calibrates the analog-to-digital conversion module based on the judgment result.

Images