ADC Compensation Circuit for DAC Mismatch Correction
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Solution Overview
Problem
Existing signal processing technologies face challenges in accurately converting analog signals to digital signals due to errors in digital-to-analog converter (DAC) circuits, which affect the efficiency and accuracy of signal processing in various applications.
Innovation Solution
The implementation of a compensation circuit that generates feedback signals to correct mismatches in DAC circuits by applying gains to digital inputs based on the feedback, thereby improving the accuracy of the analog-to-digital conversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If DAC circuits are used to convert digital signals to analog signals in ADC, then signal conversion is enabled, but errors and mismatches in DAC circuits reduce conversion accuracy
Solution Approach 1:
The patent implements a feedback mechanism where the analog output from DAC circuits is converted back to digital form by the ADC, and the difference between this feedback digital signal and the original digital input signal is used to generate correction values. These correction values are then applied to compensate for DAC circuit errors, thereby improving conversion accuracy while maintaining system reliability.
Solution Approach 2:
The patent dynamically adjusts digital correction values based on the detected error signals from the feedback mechanism. By changing the digital parameters (correction values) in response to measured deviations, the system compensates for DAC circuit mismatches and maintains high conversion accuracy despite component variations.
2Productivity
If multiple DAC circuits are used to process different portions of digital signals, then signal processing capability is improved, but mismatches between respective DAC circuits increase complexity
Solution Approach 1:
The feedback mechanism individually monitors the output of each DAC circuit by converting it back to digital form and comparing it with the corresponding digital input. This enables separate error detection and correction for each DAC circuit, managing the complexity of multiple DACs through individualized feedback loops rather than requiring complex inter-DAC coordination.
Solution Approach 2:
The patent divides the digital signal into multiple portions, each processed by a separate DAC circuit. Each DAC circuit handles a specific segment of the overall signal, allowing independent error detection and correction for each segment. This segmentation approach manages complexity by treating each DAC circuit as an independent unit with its own feedback path.
3Measurement precision
If error compensation mechanisms are implemented to correct DAC mismatches, then conversion accuracy is improved, but device complexity increases
Solution Approach 1:
The compensation mechanism uses a feedback loop that leverages the existing ADC and DAC infrastructure. Rather than introducing completely separate compensation hardware, the system reuses the ADC to convert DAC outputs back to digital form, and uses digital signal processing to generate correction values. This feedback-based approach improves accuracy while minimizing additional hardware complexity.
Solution Approach 2:
The system uses its own existing components (the ADC and digital processing capabilities) to detect and correct DAC errors. The ADC serves dual purposes: both converting external analog inputs and verifying DAC outputs for compensation. This self-service approach allows error compensation without requiring external calibration equipment or complex external compensation circuits.
Data Source
AI summary
Aspects of the disclosure are directed to compensating for errors in in an analog-to-digital converter circuit (ADC). As may be implemented in accordance with one or more embodiments, an apparatus and/or method involves an ADC that converts an analog signal into a digital signal using an output from a digital-to-analog converter circuit (DAC). A compensation circuit generates a compensation output by, for respective signal portions provided to the DAC, generating a feedback signal based on an incompatibility between the conversion of the signal portions into an analog signal and the value of the signal portions provided to the DAC. A compensation output is generated based on the signal input to the DAC with a gain applied thereto, based on the feedback signal.