Multibit DAC Element Selection for Noise-Limited Sigma-Delta Conversion
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Solution Overview
Problem
Continuous time sigma delta converters generate excessive noise during digital to analog signal conversion, leading to reduced quality of analog signal conversion to digital signal due to the use of all elements of the digital to analog converter, which results in errors.
Innovation Solution
Adaptive selection of digital to analog converter elements based on input signal magnitude to limit noise generation, using between two and sixteen bits of a multibit analog to digital circuit, and decoupling extraneous elements from the converter input to generate a noise-limited analog signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all elements of the digital to analog converter are used for any input signal, then the conversion is performed using the full converter capability, but the noise generation increases
Solution Approach 1:
The patent implements dynamic element selection where the number of digital to analog converter elements activated is adjusted based on the magnitude of the input signal. For low-magnitude signals, fewer elements are used; for high-magnitude signals, more elements are activated. This dynamic adaptation resolves the contradiction by matching converter resource usage to actual signal requirements, maintaining conversion quality while minimizing noise generation.
Solution Approach 2:
The patent changes the operational parameters of the digital to analog converter by varying the number of active converter elements according to signal magnitude. This parameter change allows the system to optimize between conversion accuracy and noise levels, using full converter capability only when necessary for high-amplitude signals while using reduced element sets for low-amplitude signals to minimize noise.
2Object-generated harmful factors
If fewer digital to analog converter elements are used, then the noise generation is reduced, but the conversion accuracy may deteriorate
Solution Approach 1:
The system dynamically adjusts the number of active converter elements based on real-time signal magnitude assessment. When the input signal magnitude is high, more elements are activated to maintain conversion accuracy. When the signal magnitude is low, fewer elements are sufficient, reducing noise while maintaining adequate accuracy. This dynamic adjustment resolves the contradiction between noise reduction and accuracy maintenance.
Solution Approach 2:
The patent varies the operational parameter of converter element quantity based on signal characteristics. By changing this parameter adaptively, the system achieves optimal balance between noise levels and conversion precision for different signal conditions, using maximum precision only when the signal magnitude requires it.
Data Source
AI summary
Several methods and a system of noise limitation of a signal dependent multibit digital to analog signal conversion are disclosed. An exemplary embodiment provides a method that includes receiving an output of a multibit analog to digital circuit of a continuous time sigma delta converter. The method further includes limiting a noise generation by adaptively selecting a digital to analog converter element out of a plurality of digital to analog converter elements in accordance with an input signal magnitude. In addition, the method includes implementing a selected digital to analog converter element to generate an analog signal.