CN210780730U - Analog-to-digital converter precision measurement system - Google Patents
Analog-to-digital converter precision measurement system Download PDFInfo
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- CN210780730U CN210780730U CN201922279060.2U CN201922279060U CN210780730U CN 210780730 U CN210780730 U CN 210780730U CN 201922279060 U CN201922279060 U CN 201922279060U CN 210780730 U CN210780730 U CN 210780730U
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Abstract
The embodiment of the utility model provides an analog-to-digital converter precision measurement system, this system includes signal measurement device and controller; the signal measurement device is coupled to the controller and configured to: the device comprises a signal generator, a controller and a signal processing unit, wherein the signal generator can receive a test signal, measure the test signal, obtain a signal measurement value and send the signal measurement value to the controller; the precision of the signal measuring device is higher than that of the signal generator; and the controller is used for determining a theoretical conversion value of the corresponding analog-to-digital conversion according to the signal measurement value and the resolution of an analog-to-digital converter, and determining the precision of the analog-to-digital converter by combining an actual conversion value provided by the output of the analog-to-digital converter. The embodiment of the utility model provides a measure through the higher signal measurement device of adoption precision and obtain test signal's more accurate signal measurement value to obtain accurate theoretical conversion value. Therefore, the accuracy of the precision measurement of the analog-to-digital converter can be improved.
Description
Technical Field
The embodiment of the utility model provides a precision measurement technical field especially relates to an analog-to-digital converter precision measurement system.
Background
Analog-to-Digital converters (ADCs) are used as interfaces for Analog and Digital technologies, are widely used in various fields such as industrial control, radar, communication, and consumer electronics, and play an important role in information technology centers. The accuracy of the ADC determines the performance and quality of the associated product. Accurate measurement of the accuracy of the ADC is the basis for controlling the accuracy of the ADC.
In the prior art, a signal generator is used to generate a test signal (the test signal includes a conversion signal and a reference signal), and the test signal is input to an ADC, and the ADC corresponds to a theoretical conversion value based on each group of test signals, and compares the theoretical conversion value with an actual conversion value of the ADC based on the same test signal to calculate the accuracy of the ADC.
However, the above-mentioned method of ADC accuracy measurement (specifically, the calculation method of the theoretical conversion value) includes at least the following disadvantages: on the one hand, the precision of the signal generator is limited, and the actually output test signal value deviates from the preset value. On the other hand, when a test signal is input to the ADC module through a chip pin (the ADC module is usually located in a chip), the chip pin also serves as a load, and the load may be different for each chip; therefore, even if the signal value output by the signal generator is equal to the preset value, the signal value actually input to the ADC module is weakened after passing through the chip pin.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides an analog-to-digital converter precision measurement system to improve ADC precision measurement's the degree of accuracy.
The utility model discloses a first aspect of the embodiment provides an analog-to-digital converter precision measurement system, include: a signal measuring device and a controller;
the signal measurement device is coupled to the controller and configured to: the device comprises a signal generator, a controller and a signal processing unit, wherein the signal generator can receive a test signal, measure the test signal, obtain a signal measurement value and send the signal measurement value to the controller; the precision of the signal measuring device is higher than that of the signal generator;
and the controller is used for determining a theoretical conversion value of the corresponding analog-to-digital conversion according to the signal measurement value and the resolution of an analog-to-digital converter, and determining the precision of the analog-to-digital converter by combining an actual conversion value provided by the output of the analog-to-digital converter.
In one possible embodiment, the signal generator has a first output and a second output for outputting the reference signal and the switching signal, respectively;
the signal measuring device is provided with a first measuring end and a second measuring end which are respectively used for measuring the reference signal and the converted signal;
the system also includes a first signal isolation circuit and a second signal isolation circuit; and a first measurement terminal of the signal measurement device is coupled to a first output terminal of the signal generator through the first signal isolation circuit; the second measuring terminal of the signal measuring device is coupled to the second output terminal of the signal generator through the second signal isolation circuit.
In one possible design, the first and second signal isolation circuits include resistors.
In one possible embodiment, the resistance of the resistor is greater than or equal to 1K ohm and less than or equal to 2K ohm.
In one possible embodiment, the signal measuring device comprises at least one multimeter.
In one possible design, the signal measuring device comprises at least one oscilloscope.
In one possible embodiment, the signal measuring device and the controller are integrated in the same device.
In one possible design, the analog-to-digital converter is a built-in analog-to-digital converter of a single chip microcomputer.
A second aspect of the embodiments of the present invention provides an analog-to-digital converter precision measurement system, including: the device comprises a signal generator, an analog-to-digital converter, a signal measuring device and a controller;
the signal generator is respectively coupled with the analog-to-digital converter and the signal measuring device and used for generating a test signal and sending the test signal to the analog-to-digital converter;
the analog-to-digital converter is coupled with the controller and used for generating an actual conversion value according to the test signal and sending the actual conversion value to the controller;
the signal measuring device is coupled with the controller and used for measuring the test signal to obtain a signal measured value and sending the signal measured value to the controller; the precision of the signal measuring device is higher than that of the signal generator;
and the controller is used for determining a theoretical conversion value of the corresponding analog-to-digital converter according to the signal measurement value and the resolution of the analog-to-digital converter, and determining the precision of the analog-to-digital converter according to the theoretical conversion value and the actual conversion value.
In one possible design, the analog-to-digital converter precision measurement system further includes a terminal device;
the terminal device is coupled with the signal generator and used for inputting a test instruction and providing the test instruction to the signal generator so that the signal generator generates the test signal according to the test instruction.
The analog-to-digital converter precision measurement system provided by the embodiment comprises: a signal measuring device and a controller; the signal measurement device is coupled to the controller and configured to: the device comprises a signal generator, a controller and a signal processing unit, wherein the signal generator can receive a test signal, measure the test signal, obtain a signal measurement value and send the signal measurement value to the controller; the precision of the signal measuring device is higher than that of the signal generator; and the controller is used for determining a theoretical conversion value of the corresponding analog-to-digital conversion according to the signal measurement value and the resolution of an analog-to-digital converter, and determining the precision of the analog-to-digital converter by combining an actual conversion value provided by the output of the analog-to-digital converter. By adopting the signal measuring device with higher precision to measure and obtain the signal measurement value of the test signal generated by the signal generator, the accurate signal measurement value can obtain the accurate theoretical conversion value. Therefore, the accuracy of the precision measurement of the analog-to-digital converter can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an analog-to-digital converter precision measurement system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an analog-to-digital converter precision measurement system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of an analog-to-digital converter precision measurement system according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a signal isolation circuit of an analog-to-digital converter precision measurement system according to an embodiment of the present invention.
Reference numerals:
101: a terminal device;
102: a signal generator;
103: an analog-to-digital converter;
104: a signal measuring device;
105: a controller;
106: a first signal isolation circuit;
107: a second signal isolation circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is the structural schematic diagram of an analog-to-digital converter precision measurement system provided by the embodiment of the present invention, as shown in fig. 1, this system includes terminal device 101, signal generator 102 and ADC, the output of terminal device 101 with the input of signal generator 102 is coupled, the output of signal generator 102 with the input of ADC is coupled, the output of ADC with the input of terminal device 101 is coupled. Alternatively, the terminal device 101 may be a computer, a tablet, or a mobile phone, and the terminal device 101 may be connected to the signal generator 102 in a wired or wireless manner.
In the specific precision measurement process of the analog-to-digital converter 103: inputting a test instruction to a terminal device 101 coupled to a signal generator 102, the test instruction including a predetermined test value; after receiving the test instruction, the signal generator 102 generates a test signal according to the test instruction, and outputs the test signal to the ADC; here, the test value refers to two values including a converted signal value and a reference signal value, and the test signal refers to two signals including a converted signal and a reference signal. The ADC converts based on the test signal value to obtain a conversion actual value and sends the conversion actual value to the terminal device 101; the terminal device 101 generates a theoretical conversion value according to the ADC resolution and a preset test value, and determines the ADC accuracy by comparing the actual conversion value with the theoretical conversion value. Alternatively, the predetermined test value may be a voltage test value or a current test value, and the voltage test value is, for example, a reference voltage and a conversion voltage.
It can be seen that, in the determination of the ADC accuracy, the accuracy of the theoretical conversion value used for comparison with the actual conversion value plays an important role. However, the accuracy of the signal generator 102 is limited, and the actual value of the output voltage deviates from the predetermined test value. For example, the keygage 33500B signal generator 102 may only be shipped with an accuracy of 1%, and when the predetermined test value is 3.300V, the actual output test value of the signal generator 102 may only be 3.315V, that is, 15mV higher than the predetermined test value. The presence of such a bias will greatly affect the accuracy of the ADC accuracy measurement. In addition, when a test signal is input to the ADC module through a chip pin (the ADC module is usually located in a chip), the chip pin also serves as a load, and the load may be different for each chip; therefore, even if the signal value output by the signal generator is equal to the preset value, the signal value actually input to the ADC module is weakened after passing through the chip pin. Therefore, to this problem, the embodiment of the utility model provides an analog-to-digital converter precision measurement system to improve ADC precision measurement's the degree of accuracy.
The technical solution of the present invention will be described in detail with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 2 is a schematic structural diagram of an analog-to-digital converter precision measurement system according to another embodiment of the present invention. As shown in fig. 2, the system includes: a signal measurement device 104 and a controller 105.
The signal measuring device 104, coupled to the controller 105, is configured to receive a test signal from the signal generator 102, measure the test signal to obtain a signal measurement value, and send the signal measurement value to the controller 105; the accuracy of the signal measuring device 104 is higher than the accuracy of the signal generator 102. The test signal refers to two signals including a reference signal and a converted signal.
The controller 105 is configured to determine a theoretical conversion value of the analog-to-digital conversion according to the signal measurement value and a resolution of an analog-to-digital converter 103, and determine an accuracy of the analog-to-digital converter 103 according to the theoretical conversion value and an actual conversion value provided by an output of the analog-to-digital converter 103.
Alternatively, the test signal may be a voltage test signal, and may also be a current test signal. And when the test signal is a current test signal, a current-voltage conversion module is added to convert the test signal into a voltage test signal, and then the voltage test signal is input into the ADC. The current-to-voltage conversion module may be a series resistance circuit. This embodiment is not limited to this.
Taking the analog-to-digital converter 103 as an example of the voltage analog-to-digital converter 103, specifically, the system may further include a current-to-voltage conversion module, and the signal generator 102 is connected to the voltage analog-to-digital converter 103 through the current-to-voltage conversion module.
Optionally, in order to facilitate the precision measurement system of the analog-to-digital converter to be more integrated, the signal measurement device 104 and the controller 105 are integrated in the same device, so that the precision measurement system of the analog-to-digital converter can be more compact in structure, the occupied space is reduced, and the signal transmission rate between the signal measurement device 104 and the controller 105 can be improved, and the interference of external signals is reduced.
The specific working process of the analog-to-digital converter precision measurement system provided by the embodiment is as follows: the signal generator 102 receives a test instruction sent by the terminal device 101 or the controller 105, generates a test signal according to the test instruction, and sends the test signal to the analog-to-digital converter 103; the analog-to-digital converter 103 generates an actual conversion value according to the test signal, and sends the actual conversion value to the controller 105; the signal measurement device 104 measures the test signal to obtain a signal measurement value, and sends the signal measurement value to the controller 105; the controller 105 determines the theoretical conversion value of the conversion from the signal measurement value and the analog-to-digital converter resolution, and determines the accuracy of the analog-to-digital converter 103 from the theoretical conversion value and the actual conversion value. Wherein the accuracy of the signal measurement device 104 is higher than the accuracy of the signal generator 102.
The precision measurement system of the analog-to-digital converter provided by this embodiment measures and obtains the signal measurement value of the test signal generated by the signal generator 102 by using the signal measurement device 104 with higher precision, and the accurate signal measurement value enables an accurate theoretical conversion value to be obtained. Thereby improving the accuracy of the precision measurement of the analog-to-digital converter 103.
Optionally, in another embodiment, the analog-to-digital converter precision measurement system further includes: the signal generator 102 and the analog-to-digital converter 103;
the signal generator 102 is coupled to the signal measuring device 104 and the analog-to-digital converter 103, respectively, and configured to generate a test signal and send the test signal to the analog-to-digital converter 103. Wherein, the test signal refers to two signals including a reference signal and a conversion signal.
The analog-to-digital converter 103 is coupled to the controller 105, and configured to generate an actual conversion value according to the test signal, and send the actual conversion value to the controller 105.
Optionally, the analog-to-digital converter 103 may be a built-in analog-to-digital converter 103 of a single chip microcomputer.
The precision measurement system of the analog-to-digital converter provided by this embodiment measures and obtains the signal measurement value of the test signal generated by the signal generator 102 by using the signal measurement device 104 with higher precision, and the accurate signal measurement value enables an accurate theoretical conversion value to be obtained. Thereby improving the accuracy of the precision measurement of the analog-to-digital converter 103.
Alternatively, on the basis of the above-mentioned embodiment, for example, on the basis of the embodiment shown in fig. 2, the present invention further provides an analog-to-digital converter precision measurement system, wherein the signal generator 102 may generate the test signal according to the received test instruction. The test instruction received by the signal generator 102 may be from various sources, for example, the test instruction may be input to the signal generator 102 by a user through the terminal device 101 shown in fig. 1, or may be transmitted by the controller 105 shown in fig. 2 according to a value stored in an internal memory. Of course, the controller 105 may be a processor of the terminal apparatus 101.
Optionally, in another embodiment, the precision measurement system of the analog-to-digital converter further includes: a terminal device;
the terminal device is coupled to the signal generator 102, and configured to perform an input operation of a test instruction, and provide the test instruction to the signal generator 102, so that the signal generator 102 generates the test signal according to the test instruction.
In this embodiment, the terminal device may be the terminal device 101 shown in fig. 1. The test instructions may include predetermined test values (e.g., predetermined transition signal values and predetermined reference signal values).
Specifically, the terminal device receives a test instruction input by a user, and provides the test instruction to the signal generator 102, and the signal generator 102 generates a test signal according to the test instruction and outputs the test signal to the ADC; the ADC converts based on the test signal value to obtain a conversion actual value, and sends the conversion actual value to the controller 105; the signal measuring device 104 tests the measurement signal generated by the signal generator 102 to obtain a test value of the measurement signal, and sends the test value to the controller 105, the controller 105 generates a theoretical conversion value of analog-to-digital conversion according to the test value and the resolution of the ADC, and determines the accuracy of the ADC based on the theoretical conversion value and the actual conversion value.
In this embodiment, the terminal device is used to input the test instruction, so that the signal measurement device 104 generates the corresponding test signal according to the test instruction, so that the user can conveniently set the test signal value, and the signal measurement device 104 with higher precision is used to measure and obtain the signal measurement value of the test signal generated by the signal generator 102, so that the accurate signal measurement value can obtain the accurate theoretical conversion value. Thereby improving the accuracy of the precision measurement of the analog-to-digital converter 103.
In a specific embodiment, the test signal is a voltage test signal. The test signal includes a reference voltage and a converted voltage. The analog-to-digital converter precision measurement system comprises a signal generator 102, an analog-to-digital converter 103, a signal measurement device 104 and a controller 105. The signal generator 102 includes a first output terminal and a second output terminal for outputting a reference voltage and a converted voltage, respectively; the analog-to-digital converter 103 comprises a first input terminal and a second input terminal for receiving the reference voltage and the converted voltage, respectively; the signal measuring device 104 includes a first measuring terminal and a second measuring terminal for measuring the reference voltage and the converted voltage, respectively.
A first output end of the signal generator 102 is connected to a reference voltage input end of the analog-to-digital converter 103, a second output end is connected to a conversion voltage input end of the analog-to-digital converter 103, and the signal generator 102 receives a test instruction, that is, a reference voltage value and a conversion voltage value, generates the reference voltage and the conversion voltage according to the test instruction, and provides the reference voltage and the conversion voltage to the analog-to-digital converter 103 respectively.
The analog-to-digital converter 103 is specifically configured to perform analog-to-digital conversion on the converted voltage according to the reference voltage to obtain an actual conversion value of the converted voltage, and send the actual conversion value to the controller 105.
A first measurement end of the signal measurement device 104 is connected to the first output end of the signal generator 102, a second measurement end is connected to the second output end of the signal generator 102, and the signal measurement device 104 is specifically configured to measure the converted voltage and the reference voltage respectively to obtain a first measurement value of the converted voltage and a second measurement value of the reference voltage, and send the first measurement value and the second measurement value to the controller 105; the accuracy of the signal measuring device 104 is higher than the accuracy of the signal generator 102.
The controller 105 is specifically configured to determine a theoretical conversion value of the converted voltage according to the first measurement value, the second measurement value, and the ADC resolution, and determine the accuracy of the analog-to-digital converter 103 according to the theoretical conversion value and the actual conversion value.
Optionally, the signal measurement device 104 comprises at least one multimeter.
Optionally, the signal measurement device 104 comprises at least one oscilloscope.
In practical applications, the signal measuring device 104 can be implemented in various ways, for example, in one implementation, the signal measuring device 104 can be a multimeter, and the multimeter can be provided with a plurality of positive measuring terminals, including a first measuring terminal and a second measuring terminal. During measurement, the first measuring end is connected with the first output end of the signal generator 102, the second measuring end is connected with the second output end of the signal generator 102, and the negative electrode corresponding to the first measuring end and the negative electrode corresponding to the second measuring end are both grounded. Of course, if the single multimeter provides only one positive measurement terminal, then the two output terminals of the signal generator can be measured in sequence to obtain signal measurement values (a first measurement value of the converted voltage and a second measurement value of the reference voltage). In another implementation, the signal measurement device 104 may include two multimeters or two oscilloscopes, or both multimeters and oscilloscopes may be used simultaneously. In actual measurement, different multimeters can be used to simultaneously measure the voltage values (e.g., the reference voltage and the converted voltage) at different outputs of the signal generator 102. For example, a multimeter may be used to measure the voltage at a first output of the signal generator 102, and an oscilloscope may be used to measure the voltage at a second output of the signal generator 102. This embodiment is not limited to this.
The embodiment provides an analog-to-digital converter precision measurement system, which comprises a signal generator 102, an analog-to-digital converter 103, a signal measurement device 104 and a controller 105. The test signal includes a reference voltage and a converted voltage. The signal generator 102 receives a test instruction, generates the reference voltage and the conversion voltage according to the test instruction, and sends the reference voltage and the conversion voltage to the analog-to-digital converter 103 respectively. The analog-to-digital converter 103 performs analog-to-digital conversion on the converted voltage according to the reference voltage to obtain an actual conversion value of the converted voltage, and sends the actual conversion value to the controller 105. The signal measuring device 104 measures the converted voltage and the reference voltage respectively to obtain a first measured value of the converted voltage and a second measured value of the reference voltage, and sends the first measured value and the second measured value to the controller 105; the accuracy of the signal measuring device 104 is higher than the accuracy of the signal generator 102. The controller 105 determines a theoretical conversion value of the conversion according to the first measurement value, the second measurement value, and the resolution of the analog-to-digital converter 103, and determines the accuracy of the analog-to-digital converter 103 according to the theoretical conversion value and the actual conversion value. The system adopts the signal measuring device 104 with higher precision to measure and obtain the signal measurement values of the reference voltage and the conversion voltage generated by the signal generator 102, obtains a more accurate theoretical conversion value of the conversion voltage according to the signal measurement values, and determines the precision of the analog-digital converter 103 according to the theoretical conversion value and the actual conversion value actually generated by the analog-digital converter 103, thereby being capable of improving the precision measurement accuracy of the analog-digital converter 103.
Fig. 3 is a schematic structural diagram of a precision measurement system of an analog-to-digital converter according to another embodiment of the present invention. As shown in fig. 3, in order to reduce the interference of the signal measuring device 104 on the input terminal of the ADC on the basis of the system shown in fig. 2, the analog-to-digital converter precision measuring system provided by this embodiment further includes: first signal isolation circuitry 106 and/or second signal isolation circuitry 107.
A first measuring terminal of the signal measuring device 104 is connected to a first output terminal of the signal generator 102 through the first signal isolating circuit 106;
and/or the presence of a gas in the gas,
a second measuring terminal of the signal measuring device 104 is connected to a second output terminal of the signal generator 102 via the second signal isolation circuit 107.
In practical applications, when the signal measuring device 104 is coupled to the circuit configuration of the two output terminals of the signal generator 102, a signal isolation circuit is simultaneously connected in series between the measuring terminal of the signal measuring device 104 and the output terminal of the signal generator 102.
Optionally, the first signal isolation circuit 106 includes a resistor.
The following description will be made with reference to fig. 4 to illustrate the principle and beneficial effects of the analog-to-digital converter precision measurement system after the signal isolation circuit is connected: as shown in fig. 4, taking one of the access paths as an example, for example, taking one access path formed by the first measurement terminal of the signal measurement device 104, the first signal isolation circuit 106 and the first output terminal of the signal generator 102 as an example, the signal measurement device 104 itself, as a signal source (signal source a), may also generate an interference signal to the outside, and the analog-to-digital converter 103, as a signal receiver, only wants to receive a signal sent by the first output terminal of the signal source B (signal generator 102), and does not want to receive other interference signals. Therefore, in order to reduce the influence of the signal measuring device 104 itself as a signal source on the analog-to-digital converter 103, the first signal isolation circuit 106 is added, the first signal isolation circuit 106 is composed of a resistor, and due to the addition of the resistor, the interference signal sent by the signal source a is attenuated by the isolation resistor during transmission, so that the influence of the interference signal source a on the signal of the signal source B is reduced. The input end of the analog-to-digital converter 103 receives a more accurate undisturbed test signal, so that the actual conversion value of the conversion voltage generated by the analog-to-digital converter 103 is more accurate, and the accuracy of the precision measurement of the analog-to-digital converter 103 is further improved.
Optionally, the resistance of the resistor is greater than or equal to 1K ohm and less than or equal to 2K ohm. In practical application, the resistance value of the resistor should be moderate, too small can cause insufficient attenuation degree of the signal of the interference signal source a, too large can obviously attenuate the measured value of the direct current amplitude of the signal source B on the voltage measuring device, and the resistance value can be any value between 1K ohm and 2K ohm.
In the precision measurement system of the analog-to-digital converter provided by this embodiment, the signal measurement device 104 with higher precision is used to measure and obtain the signal measurement values of the reference voltage and the conversion voltage generated by the signal generator 102, and obtain a more accurate theoretical conversion value of the conversion voltage according to the signal measurement values, and determine the precision of the analog-to-digital converter 103 according to the theoretical conversion value and the actual conversion value actually generated by the analog-to-digital converter 103, so as to improve the precision measurement accuracy of the analog-to-digital converter 103. In addition, by arranging the signal isolation circuit, the interference signal sent by the signal measurement device 104 is attenuated by the signal isolation circuit during transmission, so that the influence of the interference signal source a on the signal of the signal source B is reduced. The input end of the analog-to-digital converter 103 receives a more accurate undisturbed test signal, so that the actual conversion value of the conversion voltage generated by the analog-to-digital converter 103 is more accurate, and the accuracy of the precision measurement of the analog-to-digital converter 103 is further improved.
In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, "coupled" refers, in electronics, to the transfer of energy from one circuit portion to another circuit portion. For example, energy is transferred from a voltage source to the load via a Conductive coupling (coupling). The capacitors are used to couple the ac and dc portions of the circuit by the properties of allowing the ac component to pass and blocking the dc component. The transformer may also act as a coupling medium, and by configuring appropriate impedances at both ends, appropriate impedance matching may be achieved.
In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An analog-to-digital converter precision measurement system, comprising: a signal measuring device and a controller;
the signal measurement device is coupled to the controller and configured to: the device comprises a signal generator, a controller and a signal processing unit, wherein the signal generator can receive a test signal, measure the test signal, obtain a signal measurement value and send the signal measurement value to the controller; the precision of the signal measuring device is higher than that of the signal generator;
and the controller is used for determining a theoretical conversion value of the corresponding analog-to-digital conversion according to the signal measurement value and the resolution of the analog-to-digital converter, and determining the precision of the analog-to-digital converter by combining an actual conversion value provided by the output of the analog-to-digital converter.
2. The analog-to-digital converter accuracy measurement system of claim 1,
the signal generator is provided with a first output end and a second output end which are respectively used for outputting a reference signal and a conversion signal;
the signal measuring device is provided with a first measuring end and a second measuring end which are respectively used for measuring the reference signal and the converted signal;
the method is characterized in that: the system also includes a first signal isolation circuit and a second signal isolation circuit; and a first measurement terminal of the signal measurement device is coupled to a first output terminal of the signal generator through the first signal isolation circuit; the second measuring terminal of the signal measuring device is coupled to the second output terminal of the signal generator through the second signal isolation circuit.
3. The analog-to-digital converter accuracy measurement system of claim 2, wherein the first signal isolation circuit and the second signal isolation circuit each comprise a resistor.
4. The analog-to-digital converter accuracy measuring system of claim 3, wherein the resistance of the resistor is greater than or equal to 1K ohm and less than or equal to 2K ohm.
5. The analog-to-digital converter accuracy measurement system of any of claims 1-4, wherein said signal measurement device comprises at least one multimeter.
6. The analog-to-digital converter accuracy measurement system of any one of claims 1-4, wherein said signal measurement device comprises at least one oscilloscope.
7. The analog-to-digital converter accuracy measurement system of any one of claims 1-4, wherein said signal measurement device and said controller are integrated in the same device.
8. The analog-to-digital converter precision measuring system of any one of claims 1-4, characterized in that the analog-to-digital converter is a built-in analog-to-digital converter of a single chip microcomputer.
9. An analog-to-digital converter precision measurement system, comprising: the device comprises a signal generator, an analog-to-digital converter, a signal measuring device and a controller;
the signal generator is respectively coupled with the analog-to-digital converter and the signal measuring device and used for generating a test signal and sending the test signal to the analog-to-digital converter;
the analog-to-digital converter is coupled with the controller and used for generating an actual conversion value according to the test signal and sending the actual conversion value to the controller;
the signal measuring device is coupled with the controller and used for measuring the test signal to obtain a signal measured value and sending the signal measured value to the controller; the precision of the signal measuring device is higher than that of the signal generator;
and the controller is used for determining a theoretical conversion value of the corresponding analog-to-digital converter according to the signal measurement value and the resolution of the analog-to-digital converter, and determining the precision of the analog-to-digital converter according to the theoretical conversion value and the actual conversion value.
10. The analog-to-digital converter accuracy measurement system of claim 9, wherein: the precision measurement system of the analog-to-digital converter also comprises terminal equipment;
the terminal device is coupled with the signal generator and used for inputting a test instruction and providing the test instruction to the signal generator so that the signal generator generates the test signal according to the test instruction.
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| CN201922279060.2U CN210780730U (en) | 2019-12-18 | 2019-12-18 | Analog-to-digital converter precision measurement system |
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