Multi-Phase DA Conversion for Precise Wideband Waveform Synthesis
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Solution Overview
Problem
Existing digital-to-analog converters face challenges in achieving precise waveform reproduction across a wide frequency range while maintaining a finite dynamic range, particularly due to overlapping sampling timings and inefficient use of sub and additional conversion units.
Innovation Solution
A DA conversion apparatus that utilizes multiple sub DA conversion units with different relative phases and additional DA conversion units with distinct sampling periods, combined with an output unit for signal synthesis, to minimize overlapping sampling and enhance waveform reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sub DA conversion units with different relative phases are used, then waveform reproduction precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the DA conversion function into multiple sub DA conversion units (30a-30d), each handling different phases of the input signal. This segmentation allows parallel processing of multiple signal phases simultaneously, improving waveform reproduction precision while managing complexity through functional decomposition
Solution Approach 2:
The patent combines outputs from multiple sub DA conversion units and additional DA conversion units through an output unit (50) that performs synthesis. By merging the results of parallel conversions with different sampling periods and phases, the system achieves high-precision waveform reproduction across a wide frequency range
2Adaptability or versatility
If additional DA conversion units with distinct sampling periods are added, then frequency range coverage is improved, but overlapping sampling issues worsen
Solution Approach 1:
The patent changes the sampling period parameter for different DA conversion units. Sub DA conversion units use a first sampling period while additional DA conversion units use a second sampling period that is an integer multiple of the first. This parameter differentiation allows each unit to operate at optimized sampling rates, expanding frequency range coverage while the output unit coordinates their outputs to prevent overlapping sampling issues
3Adaptability or versatility
If more conversion units are used to extend frequency range, then adaptability is improved, but manufacturing cost increases
Solution Approach 1:
The patent designs additional DA conversion units (40) that can serve multiple functions: they process signals at different sampling periods and can be selectively activated based on frequency requirements. This multi-functionality allows the system to maintain frequency range adaptability while reducing manufacturing cost by only activating necessary units for each operating condition
Data Source
AI summary
Provided is a DA conversion apparatus which generates an output signal in analog format obtained by performing DA conversion on a target signal in digital format, the DA conversion apparatus including: a plurality of sub DA conversion units which perform DA conversion on the target signal with a common first sampling period such that relative phases with respect to the target signal are different from each other; a first additional DA conversion unit which performs DA conversion on the target signal with a second sampling period different from the first sampling period; and an output unit which generates the output signal based on respective outputs of the plurality of sub DA conversion units and an output of the first additional DA conversion unit.