Self-Calibrating AD Converter for Remote Accuracy Stability
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Solution Overview
Problem
Existing AD converters require an external measuring device for calibration, making it difficult to calibrate multiple converters at remote locations, especially due to temperature and time-dependent changes in offset voltage and unit voltage linearity.
Innovation Solution
An AD converter with a self-calibration function, incorporating a control unit, reference voltage unit, integrating converter unit, and crossbar switch, which allows for internal calibration by comparing integrated and input voltages, eliminating the need for external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an external measuring device is used for calibration, then calibration accuracy can be maintained, but the complexity of calibration operation increases and remote calibration becomes difficult
Solution Approach 1:
The AD converter performs self-calibration using internal components (integrating converter unit, comparator, crossbar switch) without requiring external measuring devices. The control unit automatically controls the calibration process by switching connections and comparing voltages, enabling the system to calibrate itself remotely without external intervention.
Solution Approach 2:
The calibration function is merged with the AD converter itself by integrating the integrating converter unit, comparator, and crossbar switch within the converter. This combines the measurement and calibration functions into a single device, eliminating the need for separate external measuring equipment.
2Measurement precision
If an external measuring device is carried for remote calibration, then calibration can be performed, but the difficulty of calibrating multiple AD converters increases
Solution Approach 1:
Each AD converter independently performs self-calibration using its own internal components, eliminating the need to transport or set up external measuring devices for each converter. This simplifies the calibration system and enables easy calibration of multiple converters at remote locations.
3Reliability
If periodic calibration is performed to maintain accuracy over time, then conversion accuracy is maintained, but the need for external measuring devices increases operational difficulty
Solution Approach 1:
The AD converter automatically performs periodic self-calibration without requiring external measuring devices. The control unit controls the calibration process internally using the integrating converter unit and comparator, maintaining conversion accuracy over time while simplifying operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables remote calibration of AD converters without external measuring devices, ensuring long-term stability and accuracy by compensating for temperature and time-dependent changes in offset voltage and unit voltage linearity.
Implementation Method 1
an integrating unit that generates an integrated voltage by integrating a predetermined unit voltage
Implementation Method 2
a comparator that has two inputs and compares the integrated voltage and an input voltage or the reference voltage
Data Source
AI summary
An AD converter is provided with a control unit including a calibration control unit that controls an operation for calibrating the control unit and a conversion control unit that controls an operation for converting a target input voltage into a digital signal; a reference voltage unit that outputs a reference voltage; and an integrating converter unit including an integrating unit that generates an integrated voltage by integrating a predetermined unit voltage, a comparator that has two inputs and compares the integrated voltage and an input voltage or a reference voltage Vref, and a crossbar switch that switches connections between the case where the integrated voltage is inputted to one of the inputs of the comparator and the input voltage or the reference voltage Vref is inputted to the other input and the case where the input voltage or the reference voltage Vref is inputted to one of the inputs of the comparator and the integrated voltage is inputted to the other input.