DAC Calibration Using Embedded Comparator and Event Triggers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional digital-to-analog converter (DAC) calibration methods require additional calibration circuits, increasing circuit area and power consumption, and are unable to automatically adapt to environmental changes or hacker attacks that affect conversion accuracy.
Innovation Solution
A control circuit comprising a switch, an analog comparator, and a signal converter control unit that selectively enables calibration based on event trigger signals, allowing for automatic calibration without additional hardware and reducing power consumption by only activating components when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a calibration circuit with analog comparator is added to calibrate the DAC, then the calibration accuracy is improved, but the circuit area increases
Solution Approach 1:
The patent merges the calibration function into the existing control circuit by repurposing the analog comparator and switch that already exist in the DAC system. The comparator is used both for normal operation and for calibration, eliminating the need for separate calibration circuitry while maintaining calibration accuracy.
Solution Approach 2:
The existing analog comparator and switch in the DAC system are made multi-functional by enabling them to perform both their original functions and the calibration function. The control circuit selectively activates the comparator for calibration purposes using existing hardware resources, achieving universal utilization of components.
2Measurement precision
If a calibration circuit with analog comparator is added to calibrate the DAC, then the calibration accuracy is improved, but the power consumption increases
Solution Approach 1:
The calibration process is implemented as a periodic or event-triggered action rather than a continuous operation. The control circuit activates the analog comparator and switch only when calibration is needed, allowing the system to consume minimal power during normal operation while maintaining the ability to calibrate when required.
Solution Approach 2:
The system dynamically switches between calibration mode and normal operation mode based on system conditions. The control circuit selectively enables or disables the calibration function, allowing the power consumption to adapt to the actual needs of the system rather than remaining constantly high.
3Measurement precision
If the calibration circuit is continuously active to maintain accuracy, then the calibration precision is maintained, but the power consumption increases
Solution Approach 1:
Instead of continuous calibration, the system performs calibration periodically or when triggered by specific events such as temperature changes or suspected hacking attempts. This periodic approach maintains calibration precision when needed while minimizing power consumption during normal operation.
Solution Approach 2:
The control circuit monitors system conditions and triggers calibration only when necessary based on feedback from temperature sensors, operation status, or detected anomalies. This feedback-driven approach ensures calibration precision is maintained through selective calibration events rather than continuous operation.
4Reliability
If additional calibration circuitry is added to resist hacker attacks, then the security is improved, but the device complexity increases
Solution Approach 1:
The system performs self-calibration using its existing control circuit and analog comparator without requiring external calibration equipment or additional security circuitry. The control circuit automatically detects calibration needs and executes calibration routines, providing security against hacking through intelligent use of existing resources rather than added complexity.
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
This solution reduces circuit area and power consumption while enabling automatic calibration and resistance to hacker attacks by using existing control circuitry to calibrate the DAC, ensuring accurate and secure signal conversion over time.
Implementation Method 1
the calibration circuit uses an analog comparator to compare reference signal with the analog signal, which is actually converted by the DAC
Data Source
AI summary
A control circuit and a method of calibrating a signal converter (such as DAC) are disclosed. The control circuit can be an existing control circuit, so no additional calibration circuit is required and the circuit area can be reduced. The control circuit can be an embedded microcontroller or other type of microcontroller. In general, the microcontroller includes an analog comparator and an arithmetic unit. With the combination of using the arithmetic unit to execute firmware program codes and using of the analog comparator, the control circuit is able to calibrate the signal converter.