ADC Nonlinearity Compensation Using Dynamic Multidimensional Coefficients
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Solution Overview
Problem
Analog-to-digital converters (ADCs) face challenges in accurately compensating for non-linearities due to their memory effects, as static correction methods are insufficient and complex models lead to elaborate computations.
Innovation Solution
A multidimensional correction approach using notch filters and dynamic coefficients is introduced, where coefficients are determined by comparing ADC output with a desired state, considering both static and dynamic components, and stored for subsequent correction, reducing the complexity of error compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If static correction methods are used for ADC non-linearities, then the compensation is simple to implement, but the compensation is insufficient for ADCs with memory effects
Solution Approach 1:
The patent transitions from static correction coefficients to dynamic correction coefficients that adapt to the signal history. The correction coefficients are updated based on the current and past signal values, allowing the system to track and compensate for memory effects in the ADC. This dynamic approach maintains compensation accuracy while avoiding the complexity of full mathematical models.
Solution Approach 2:
The patent introduces a temporal dimension to the correction coefficients by considering past signal values. Instead of using only current signal values (0-dimensional), the system uses current and past values (1-dimensional time series), effectively adding a time dimension to the correction process. This allows the system to capture memory effects without requiring complex multi-dimensional models.
2Measurement precision
If complex mathematical models (Volterra, Wiener) are used to describe ADCs with memory, then the model accuracy is improved, but the computational complexity increases
Solution Approach 1:
The patent applies a simplified version of memory effects modeling by considering only the immediate past signal value (one sample period) rather than implementing full Volterra or Wiener models that would require multiple past values and complex computations. This partial approach captures the essential memory effects while keeping the computational burden manageable.
Solution Approach 2:
The patent changes the parameters used in correction from fixed static values to dynamic values that vary with signal history. By making the correction coefficients adaptive rather than fixed, the system achieves better accuracy without requiring the elaborate parameter sets needed by full mathematical models. The coefficients are updated incrementally based on recent signal behavior.
3Measurement precision
If multiple past sampling values are considered for correction, then the compensation accuracy for ADCs with memory is improved, but the number of coefficient fields increases
Solution Approach 1:
The patent extracts only the essential memory effect by considering a single past sampling value rather than multiple past values. This extraction approach captures the dominant memory behavior while avoiding the need to store and process multiple coefficient fields. The system takes out only the necessary historical information needed for effective compensation.
Solution Approach 2:
The patent segments the correction process into distinct components: current signal value processing and past signal value processing. By separating these functions and using a single coefficient field that is dynamically updated, the system avoids creating multiple coefficient fields. Each segment handles a specific aspect of the correction, maintaining simplicity while achieving accuracy.
Data Source
AI summary
An analog-to-digital converter circuit arrangement comprising an analog-to-digital converter that receives an analog input signal and provides a digital output signal. A correction device that corrects the digital output signal using multidimensional correction coefficients indicative of a characteristic of the analog-to-digital converter to be compensated for, and provides a corrected digital output signal indicative thereof.