Low Power Harmonic Wake Up Radio Using Ring Oscillator
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Solution Overview
Problem
Current wireless communication devices face challenges in quickly waking up from low power mode while conserving battery life, as existing solutions either require additional hardware or increase current consumption, leading to reduced battery longevity and high latency.
Innovation Solution
A wireless receiver design utilizing a ring oscillator architecture with multiple phases and passive mixers, which selectively passes RF signal phases to minimize power consumption and achieve fast wake-up times, operating at lower frequencies to reduce current usage and hardware overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radio powers up completely to detect incoming signals, then detection capability is improved, but wake-up time increases and battery longevity decreases
Solution Approach 1:
The radio receiver is segmented into two distinct parts: a low-power wake-up radio that operates periodically to detect incoming signals, and a main radio that remains powered down. This segmentation allows the system to maintain detection capability while minimizing wake-up time and power consumption by using only the necessary wake-up radio components during low-power mode.
Solution Approach 2:
A wake-up signal serves as an intermediary mechanism that triggers the transition from low-power mode to full operation. The wake-up radio detects these signals and generates wake-up commands that activate the main radio, enabling fast wake-up times without requiring the entire radio system to remain powered on continuously.
2Speed
If a separate low-power radio is added for detecting incoming signals, then wake-up speed is improved, but hardware complexity increases
Solution Approach 1:
The wake-up radio is designed with multi-functionality, serving both as a standalone signal detection device and as an integrated component of the main radio system. It can operate independently in low-power mode for wake-up detection, and its capabilities are leveraged within the full radio architecture, eliminating the need for completely separate hardware systems.
Solution Approach 2:
The wake-up radio and main radio are merged into a unified system architecture where the wake-up radio is integrated within the broader radio device. This merging approach allows the wake-up functionality to be achieved without requiring entirely separate hardware, as the wake-up radio shares resources and integration pathways with the main radio system.
3Reliability
If the radio listens continuously for incoming communications, then detection reliability is improved, but current consumption increases and battery life decreases
Solution Approach 1:
The wake-up radio operates using periodic action by activating only at predetermined intervals to detect incoming wake-up signals. This periodic operation模式 allows the system to maintain detection reliability for incoming communications while dramatically reducing current consumption compared to continuous listening, as the wake-up radio remains inactive between periodic cycles.
Solution Approach 2:
The wake-up radio is designed to autonomously detect incoming signals and generate wake-up commands without requiring continuous external power or processing resources. Its self-service capability allows it to operate independently in low-power mode, triggering the main radio only when necessary, thereby reducing overall current consumption while maintaining detection reliability.
Data Source
AI summary
A wireless receiver includes a receiver mixer having at least two sets of switches connected to selectively pass a portion of a received RF signal to the mixer's output. Different sets of the switches are activated by different phases of a local oscillator to effect passing of different phases of the RF signal to the output. These outputs are combined in various ways to obtain operation of the main receiver and the wake up receiver modes at harmonically related carrier frequencies with as low as possible subharmonic multi-phase clock generation network. This can be used to detect a wake up signal with a very fast response time, minimal area overhead, minimal power usage, and equal loading to the local oscillator network providing the phases to the mixer to maintain excellent phase balance and precise harmonic selectivity.