Poly-Phase Decimator for Multi-Phase ADC Outputs
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Solution Overview
Problem
Conventional analog-to-digital converters using delta-sigma modulators lack the ability to generate multiple output signals of different phases, which complicates the design and increases processing load on the digital signal processing module, and results in higher power consumption due to unnecessary sampling frequencies.
Innovation Solution
An analog-to-digital converter equipped with a poly-phase decimator that converts an analog signal to a high-frequency datastream, which is then downsampled to generate multiple low-frequency datastreams with the same sampling rate but different phases, reducing the processing load and power consumption by allowing the DSP module to operate at lower frequencies and only generating required data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the analog-to-digital converter generates only a single medium-frequency datastream, then the converter structure is simple, but the DSP module must perform additional phase transformation operations increasing processing load and power consumption
Solution Approach 1:
The single medium-frequency datastream is segmented into multiple low-frequency datastreams with different phases through the poly-phase decimator. This segmentation allows the DSP module to receive pre-separated phase components, eliminating the need for additional phase transformation operations and reducing processing load.
Solution Approach 2:
The analog-to-digital converter performs preliminary phase separation by generating multiple phase-differentiated low-frequency datastreams before the signal reaches the DSP module. This preliminary action of phase decomposition reduces the processing burden on the DSP module, as the phase transformation is already completed in the conversion stage.
2Productivity
If the analog-to-digital converter generates multiple low-frequency datastreams with different phases, then the DSP module processing load is reduced, but the converter structure becomes more complex
Solution Approach 1:
The poly-phase decimator combines multiple decimation operations into a single integrated structure that processes the high-frequency datastream and simultaneously generates multiple low-frequency datastreams with different phases. This merging approach achieves multiple outputs through one unified component rather than requiring separate conversion paths.
Solution Approach 2:
The poly-phase decimator performs multiple functions within a single structure: it downsamples the high-frequency datastream, separates it into multiple phase components, and outputs several low-frequency datastreams simultaneously. This multi-functionality reduces the need for additional separate components in the analog-to-digital converter.
3Measurement precision
If the analog-to-digital converter outputs a medium-frequency datastream with high sampling rate, then the signal quality is maintained, but the DSP module must operate at higher frequency increasing power consumption
Solution Approach 1:
The high-frequency datastream is segmented into multiple low-frequency datastreams, each with a reduced sampling rate. This segmentation maintains signal quality for each phase component while allowing the DSP module to operate at lower frequencies, thereby reducing power consumption.
Solution Approach 2:
The sampling rate parameter is changed from a single high frequency to multiple lower frequencies through the poly-phase decimator. Each low-frequency datastream has a sampling rate suitable for its specific phase processing requirements, optimizing the balance between signal quality and power consumption.
4Adaptability or versatility
If the analog-to-digital converter generates all possible phase datastreams, then all potential processing needs are met, but unnecessary datastreams increase processing overhead
Solution Approach 1:
The poly-phase decimator generates a set of low-frequency datastreams covering all possible phase components, but the DSP module can selectively process only the necessary subset. This partial action approach provides adaptability for different processing needs while avoiding the overhead of processing all generated datastreams.
Solution Approach 2:
The system provides dynamic adaptability where the DSP module can adjust which phase datastreams to process based on real-time requirements. The analog-to-digital converter generates all possible phases, but the processing pipeline can dynamically select and process only the necessary components, optimizing efficiency for each application.
Data Source
AI summary
A method for converting an analog signal to multiple different phase outputs with an analog-to-digital converter is provided. First, the analog signal is converted to a high-frequency datastream with a delta-sigma modulator. A plurality of low-frequency datastreams are then generated by periodically extracting the samples of the high-frequency datastream, wherein consecutively extracted samples of the high-frequency datastream are scattered to different low-frequency datastreams. The low-frequency datastreams have the same sampling rate, and the phases of the corresponding samples of the low-frequency datastreams are different from each other.