1-Bit ADC Demodulation for Low-Power Wireless Chip-to-Chip Links
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Solution Overview
Problem
Wireless chip-to-chip communication faces inefficiencies in power consumption due to high power requirements for signal demodulation, particularly with multi-bit quantization at high speeds, which leads to performance degradation from received signal amplitude sensitivity.
Innovation Solution
The use of 1-bit analog-to-digital converters (ADCs) for demodulating radio frequency signals, which are not sensitive to signal amplitude and require less power compared to multi-resolution or non-uniform ADCs, along with a polar quantizer architecture that generates constellation points using phase shifters and logic gates to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multi-bit quantization is used for signal demodulation, then signal precision is improved, but power consumption increases and performance degrades at high sampling rates
Solution Approach 1:
The patent segments the signal demodulation process into multiple stages: first performing 1-bit quantization to reduce power consumption, then applying digital signal processing techniques (such as oversampling and noise shaping) to recover signal precision. This segmentation allows the system to achieve both low power consumption and high signal precision by separating the analog quantization stage from the digital refinement stage.
Solution Approach 2:
The patent changes the quantization parameter from multi-bit to 1-bit, fundamentally altering the operating mode of the ADC. This parameter change reduces power consumption significantly while maintaining signal precision through complementary digital processing techniques that compensate for the reduced analog quantization resolution.
2Measurement precision
If multi-bit quantization is used for signal demodulation, then signal precision is improved, but performance degrades due to amplitude sensitivity at high sampling rates
Solution Approach 1:
The patent segments the demodulation process to isolate the amplitude-sensitive analog quantization stage from the rest of the signal processing chain. By using 1-bit quantization followed by digital processing, the system separates the function of amplitude detection from precision measurement, improving performance stability while maintaining signal precision.
Solution Approach 2:
The patent employs a simple 1-bit ADC that is inherently more robust and less sensitive to amplitude variations compared to complex multi-bit ADCs. This simpler, more reliable component is compensated for its lower resolution through digital processing, achieving both improved reliability and maintained precision.
3Use of energy by moving object
If 1-bit ADCs are used for demodulation, then power consumption is reduced, but signal quantization resolution decreases
Solution Approach 1:
The patent introduces digital signal processing techniques as an intermediary between the 1-bit quantization stage and the final signal output. This intermediary layer (including oversampling, noise shaping, and digital filtering) compensates for the coarse 1-bit quantization, effectively recovering signal resolution that would otherwise be lost in the quantization process.
Solution Approach 2:
The patent creates a composite demodulation system that combines the simplicity and low power consumption of 1-bit ADCs with the precision-enhancing capabilities of digital signal processing. This composite approach leverages the strengths of both analog (low power) and digital (high precision) domains to achieve overall system optimization.
Data Source
AI summary
A communication device including one or more processors configured to determine a first signal component of a received modulated signal; determine a second signal component of the received modulated signal; generate a phase shift of the first signal component; generate a phase shift of the second signal component; compare the phase shift of the first signal component and the phase shift of the second signal component with each other; and generate a plurality of constellation points, wherein each of the plurality of constellation point is based on the determination of the first signal component, the determination of the second signal component, and the comparison.