Hybrid DAC Bit-Split Architecture for Linearity and Low Power
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Solution Overview
Problem
Current digital-to-analog converters face challenges in handling non-linear distortion, power dissipation, and circuit area requirements, especially when processing digital signals with large voltage swings and small signals.
Innovation Solution
A hybrid digital-to-analog converter is designed, utilizing a switched capacitance converter for large signals to achieve high linearity and a current-steering converter for small signals, optimizing chip count, power dissipation, and area usage by processing signals based on bit portions and employing a data processor to manage signal processing between these converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single type of digital-to-analog converter is used to process both large and small signals, then the circuit structure is simple, but non-linear distortion increases and linearity deteriorates
Solution Approach 1:
The patent divides the digital-to-analog conversion function into two separate converter types: a first type of digital-to-analog converter for processing large signals and a second type for processing small signals. This segmentation allows each converter to be optimized for its specific signal range, improving overall linearity while managing complexity through functional division.
2Manufacturing precision
If a hybrid converter with multiple converter types is used to improve linearity, then signal linearity improves, but power dissipation increases
Solution Approach 1:
The patent implements dynamic signal processing where the data processor dynamically determines whether to process signals using the first type or second type of digital-to-analog converter based on signal characteristics. This dynamic allocation optimizes power dissipation by selecting the appropriate converter type for each signal, preventing unnecessary power consumption while maintaining linearity.
3Manufacturing precision
If a hybrid converter with multiple converter types is used to improve linearity, then signal linearity improves, but circuit area increases
Solution Approach 1:
The patent designs the data processor to serve multiple functions: it processes digital signals, determines signal type (large or small), and controls the selection between different digital-to-analog converter types. This multi-functionality reduces the need for separate dedicated control circuits, thereby reducing overall circuit area while maintaining the hybrid converter's linearity benefits.
Data Source
AI summary
Hybrid digital-to-analog converter and method thereof are provided. The hybrid digital-to-analog converter (DAC) includes a data processor, at least one first type DAC, at least one second type DAC, and an output circuit. The data processor processes an input digital signal to output at least one of first and second digital signals which are related to a higher bit portion and a lower bit portion of the input digital signal, respectively. If the data processor outputs the first digital signal to the first type DAC, the first type DAC converts the first digital signal. The at least one second type DAC receives and converts the second digital signal outputted from the data processor. The output circuit receives at least one output signal of the first and the second type DACs to output an output analog signal.