DAC Dynamic Element Matching With Constant Transition Rate
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Solution Overview
Problem
Conventional digital-to-analog converters (DACs) face challenges with timing and amplitude mismatches, leading to increased power consumption, hardware complexity, and inability to address harmonic distortion, as existing dynamic element matching techniques result in inefficient switching schemes and additional noise.
Innovation Solution
The implementation of a constant transition rate dynamic element matching (CTR-DEM) scheme, which determines and enforces a consistent number of transitions for DAC unit elements, reducing power consumption and mitigating harmonic distortion by ensuring a consistent error profile and 'just enough' transient switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dynamic element matching techniques are used to mitigate timing and amplitude mismatches, then mismatch errors are reduced, but power consumption increases and hardware complexity increases
Solution Approach 1:
The patent implements a dynamic element matching scheme that dynamically selects and switches between multiple DAC unit elements based on real-time transition detection. The system dynamically adjusts which elements are active during transitions versus non-transitions, optimizing performance while controlling power consumption through selective activation rather than continuous operation of all elements.
Solution Approach 2:
The DAC is segmented into multiple unit elements that can be independently controlled and switched. By dividing the DAC into separable units, the system can activate only the necessary subset of elements during transitions, reducing overall power consumption while maintaining accuracy through selective engagement of matching elements.
2Measurement precision
If conventional dynamic element matching techniques are used to mitigate timing and amplitude mismatches, then mismatch errors are reduced, but hardware complexity increases
Solution Approach 1:
The patent merges the dynamic element matching functionality directly into the DAC structure by integrating transition detection logic and element switching mechanisms within the existing DAC architecture. This consolidation reduces hardware complexity compared to separate matching circuits while maintaining the ability to correct timing and amplitude mismatches through coordinated control of unit elements.
3Measurement precision
If conventional dynamic element matching techniques are used, then some mismatch errors are addressed, but harmonic distortion is not mitigated
Solution Approach 1:
The patent converts the potentially harmful effect of transitions into a beneficial mechanism by detecting transitions and using them to trigger dynamic element switching that actively compensates for mismatch errors. The transition detection mechanism transforms what could be sources of distortion into opportunities for error correction, where the switching events themselves are used to implement the matching algorithm that reduces both mismatch errors and harmonic distortion.
Solution Approach 2:
The system implements feedback through transition detection that monitors DAC operation and uses this information to dynamically adjust element selection. The transition detection provides real-time feedback about when switching events occur, enabling the dynamic element matching logic to respond appropriately and mitigate harmonic distortion by selecting elements that minimize distortion during these critical transition moments.
Data Source
AI summary
A system includes a digital-to-analog converter comprising a plurality of unit elements, and a dynamic element matching encoder coupled to the digital-to-analog converter. The dynamic element matching encoder includes a circuit configured to determine a number of unit elements of a digital-to-analog converter to be transitioned (Ntm), determine a first number of unit elements to be turned on, and determine a second number of unit elements to be turned off. The circuit may further generate a first signal identifying individual unit elements of one or more unit elements of the digital-to-analog converter in the off state to be turned on, and a second signal identifying the individual unit elements of one or more unit elements of the digital-to-analog converter in the on state to be turned off.