UWB Pulse Detection Circuit With Correlation-Based Wake-Up
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Solution Overview
Problem
Existing ultra-wideband (UWB) reader circuits face challenges in energy efficiency and resistance to interference and spurious signals, particularly in battery-powered devices that require precise distance and orientation determination.
Innovation Solution
An electronic circuit design that includes a low noise amplifier, comparator, integrator, correlator, and quadrature demodulator to detect UWB pulses efficiently, with a wake-up trigger signal generation mechanism for energy-efficient operation and interference resistance, utilizing a directional antenna for targeted signal reception and a timing circuit for proximity-based wake-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UWB reader continuously monitors for UWB pulses to ensure reliable detection, then the detection reliability is improved, but the power consumption increases significantly
Solution Approach 1:
The electronic circuit operates in periodic cycles, alternating between a low-power sleep mode and an active detection mode. During sleep mode, the circuit consumes minimal power while periodically waking up to monitor for UWB pulses. This periodic operation allows the system to maintain detection reliability by regularly checking for pulses while significantly reducing average power consumption compared to continuous monitoring.
2Use of energy by moving object
If the UWB reader uses simple pulse detection to minimize power consumption, then the energy efficiency is improved, but the resistance to interference and spurious signals deteriorates
Solution Approach 1:
The electronic circuit performs preliminary correlation of received pulses with expected UWB pulse patterns before triggering a wake-up event. This preliminary action filters out spurious signals and interference by comparing the received signal characteristics against known UWB pulse templates. Only pulses that match the expected pattern within defined parameters trigger the wake-up, providing interference resistance while maintaining energy efficiency through selective detection.
3Measurement precision
If the UWB reader uses directional antenna for targeted signal reception, then the signal detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent employs a directional antenna with a focused radiation pattern to concentrate signal reception in specific spatial directions. This local quality approach directs the antenna's sensitivity toward expected signal sources (e.g., access control gates) while reducing sensitivity in other directions. The electronic circuit complements this by applying localized signal processing and thresholding tailored to the directional characteristics, achieving improved detection accuracy without requiring complex omnidirectional processing systems.
Data Source
AI summary
An electronic circuit for detecting an ultra-wideband pulse, the electronic circuit comprising an analog input terminal configured for connection to an ultra-wideband antenna, a low noise amplifier connected to the analog input terminal and configured to amplify one or more ultra-wideband pulses received via the ultra-wideband antenna, and a comparator connected to the low noise amplifier and configured to generate a wake-up trigger signal for ultra-wideband pulses exceeding a pre-defined pulse amplitude threshold.