ADC DAC Mismatch Compensation Without Input Shuffling
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Solution Overview
Problem
Existing signal processing technologies face challenges in achieving accurate and efficient conversion of analog signals to digital signals due to errors in digital-to-analog converters (DACs), particularly in sigma-delta conversion methods, which affect the accuracy of analog feedback signals.
Innovation Solution
An apparatus and method for error compensation in analog-to-digital converters (ADCs) that utilize two digital-to-analog converter circuits (DACs) and a compensation circuit to generate feedback signals indicative of mismatches between analog and digital signals, applying gains to correct errors without the need for shuffling devices, ensuring accurate signal conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shuffling devices are used to randomize digital inputs to DACs, then measurement precision of DAC errors is improved, but device complexity increases
Solution Approach 1:
The patent removes the shuffling device from the system entirely. Instead of using randomization to measure DAC errors, the invention directly measures errors using the actual non-randomized digital input signals that are already present in the system, thereby achieving accurate error measurement without adding complex shuffling circuitry.
Solution Approach 2:
The system uses its own existing digital input signals to the DACs for error measurement purposes. The digital signals already driving the DACs are utilized to generate feedback signals that reveal DAC mismatches, eliminating the need for separate test signals or randomization sequences.
2Manufacturing precision
If feedback signals are generated for each DAC to indicate mismatches, then manufacturing precision of signal conversion is improved, but device complexity increases
Solution Approach 1:
The patent combines the error measurement and error correction functions into a single integrated compensation circuit. The feedback signals from multiple DACs are processed together, and the gain adjustments for different DACs are coordinated through this unified circuit, achieving high conversion accuracy without proportionally increasing complexity.
Solution Approach 2:
The system generates feedback signals that indicate mismatches between DAC outputs and expected values, and uses these feedback signals to adjust gain parameters in real-time. This closed-loop feedback mechanism continuously corrects DAC errors, maintaining high signal conversion accuracy.
3Reliability
If gains are applied to digital inputs based on feedback signals, then reliability of signal conversion is improved, but device complexity increases
Solution Approach 1:
The patent adjusts the gain parameters of individual DACs based on measured errors. By dynamically changing these electrical parameters rather than replacing hardware components, the system achieves reliable signal conversion with minimal additional complexity. The gain adjustments are implemented through programmable parameters rather than complex analog circuitry.
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. Hereby, the digital inputs provided to the DACs are non-randomized.