Duty-Cycled Wake-Up Receiver for Low-Power Sensitive Detection
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Solution Overview
Problem
Conventional wake-up receivers for sensor nodes in ubiquitous sensor networks consume high power and have low reception sensitivity, making them difficult to implement as system-on-a-chip due to the use of special components like FBAR amplifiers and multi-stage detectors.
Innovation Solution
A wake-up receiver design that includes a duty cycle signal generation unit, burst signal detection unit, and data signal detection unit, which share amplification and demodulation components, operates only during active periods to reduce power consumption and enhance sensitivity, and can be implemented as a CMOS system-on-a-chip without special components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplifiers are used in the wake-up receiver to improve reception sensitivity, then reception sensitivity is improved, but power consumption increases
Solution Approach 1:
The patent applies periodic action by using duty cycling to activate the amplifier only during specific time intervals when burst signals are expected, rather than keeping it continuously on. This allows the receiver to maintain high reception sensitivity when needed while significantly reducing average power consumption during idle periods.
Solution Approach 2:
The patent implements dynamics by making the amplifier's operational state variable - switching between active and inactive states based on received signal conditions. The system dynamically adjusts its power consumption profile while maintaining reception sensitivity through on-demand activation triggered by signal detection events.
2Measurement precision
If special components like FBAR amplifiers are used to achieve high reception sensitivity, then reception sensitivity is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent replaces expensive, complex special-purpose components like FBAR amplifiers with standard, readily available CMOS-compatible amplifiers. While individual components may be less sophisticated, the overall system achieves comparable performance through intelligent control strategies, making the receiver manufacturable using standard semiconductor processes.
Solution Approach 2:
The patent compensates for using less sophisticated components by optimizing operational parameters - specifically duty cycle percentages, signal threshold levels, and timing parameters. These parameter adjustments allow standard components to achieve reception sensitivity levels previously only attainable with specialized components.
3Measurement precision
If the wake-up receiver operates continuously to maintain high reception sensitivity, then reception sensitivity is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action through duty cycling, where the receiver alternates between active listening periods and inactive sleep periods. During active periods, the receiver operates at full sensitivity; during sleep periods, power consumption is minimized. This periodic operation maintains overall system effectiveness while dramatically reducing average power usage.
Solution Approach 2:
The system employs self-service through automatic wake-up triggering - when a burst signal is detected, the receiver automatically activates without external intervention. This eliminates the need for continuous operation while ensuring the receiver is available when needed, as the system serves itself by monitoring and responding to signal conditions.
4Measurement precision
If multiple detectors are used to improve signal detection capability, then detection accuracy is improved, but chip area increases
Solution Approach 1:
The patent applies universality by designing a single detector circuit that performs multiple functions - detecting both burst signals and data signals through configurable threshold levels and timing parameters. This multi-functional approach eliminates the need for separate dedicated detectors for different signal types, reducing chip area while maintaining comprehensive detection capability.
Data Source
AI summary
Provided is a low-power wake-up receiver that is sensitive to electric waves, by which power consumed by a radio frequency (RF) transceiver of a sensor node in a ubiquitous sensor network (USN) is minimized. A wake-up receiver waking up a main transceiver includes a duty cycle signal generation unit controlling a duty cycle of a duty cycle signal; a burst signal detection unit receiving an input signal including a burst signal and a data signal based on the duty cycle signal, amplifying the input signal, and, if the amplified input signal is the burst signal, outputting a control signal; and a data signal detection unit re-amplifying the amplified input signal based on the control signal, and, if the re-amplified input signal is the data signal, outputting a wake-up signal. Power supplied to the duty cycle signal generation unit is interrupted based on the control signal and power is re-supplied to the duty cycle signal generation unit based on the wake-up signal.