Low Power Multi-Channel Mixing Architecture for IMD Wake-Up Detection
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Solution Overview
Problem
Implantable medical devices (IMDs) face challenges in conserving power due to limited battery capacity, particularly when operating RF transceivers at specific frequencies, as continuously powering up to sniff multiple communication channels for wake-up signals drains battery life and can lead to false indications from noise or interference.
Innovation Solution
A low power multiple channel mixing architecture using a direct conversion real receiver and a Weaver image rejecting mixer receiver allows simultaneous scanning of multiple communication channels, combined with a falsing protection algorithm that inhibits sniffing of channels likely to provide false wake-up signal indications, reducing power consumption by aborting or limiting processing on such channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the IMD continuously powers up the RF transceiver to sniff multiple communication channels for wake-up signals, then the detection capability is improved, but the power consumption increases
Solution Approach 1:
The patent divides the RF transceiver functionality into separate receiver circuits, each dedicated to monitoring specific communication channels. This segmentation allows the system to efficiently scan multiple channels without requiring full transceiver activation, thereby reducing overall power consumption while maintaining reliable wake-up signal detection across all channels.
Solution Approach 2:
The patent implements periodic sniff operations where the receiver is activated for limited time intervals to check for wake-up signals on multiple channels. This periodic action reduces power consumption compared to continuous monitoring, while still ensuring reliable detection of incoming signals by systematically cycling through all communication channels at predetermined intervals.
2Device complexity
If the IMD uses a single receiver to sequentially scan multiple communication channels, then the hardware complexity is reduced, but the time to detect wake-up signals increases
Solution Approach 1:
The patent combines multiple receiver circuits to operate in parallel, each monitoring specific communication channels simultaneously. This merging of receiver resources enables the system to scan multiple channels at the same time rather than sequentially, significantly reducing the time required to detect wake-up signals while distributing the processing load across multiple dedicated receivers.
Solution Approach 2:
The patent designs receiver circuits with multi-functional capabilities that can be configured to monitor different communication channels. Each receiver is designed to handle multiple channel frequencies, allowing the system to achieve comprehensive channel coverage through parallel operation while avoiding the need for separate dedicated receivers for each channel, thus balancing hardware complexity with detection speed.
3Speed
If the IMD increases the number of receiver circuits to simultaneously monitor multiple channels, then the wake-up signal detection speed is improved, but the hardware requirements and power consumption increase
Solution Approach 1:
The patent assigns different local qualities or characteristics to each receiver circuit, with each receiver optimized for monitoring specific communication channels based on their frequency ranges and signal characteristics. This localized optimization allows the system to achieve fast simultaneous multi-channel monitoring while minimizing overall hardware requirements, as each receiver is tailored to its specific monitoring task rather than being a generic full-capability transceiver.
4Reliability
If the IMD monitors all communication channels without filtering, then the false alarm rate from noise and interference increases, but the detection of valid wake-up signals is simplified
Solution Approach 1:
The patent implements preliminary filtering and validation actions before confirming wake-up signal detection. The system performs initial signal analysis, noise threshold checking, and channel validation routines that pre-screen incoming signals to distinguish genuine wake-up calls from noise and interference. This preliminary action reduces false alarm rates while maintaining simple detection logic for valid signals by eliminating false candidates early in the processing chain.
Solution Approach 2:
The patent incorporates feedback mechanisms that continuously monitor the communication environment for noise patterns and interference characteristics. The system uses this feedback information to dynamically adjust detection thresholds and filtering parameters, improving reliability by adapting to changing conditions while maintaining simple wake-up signal detection through learned environmental patterns that distinguish valid signals from false indications.
Data Source
AI summary
A low power multiple channel receiver mixing architecture for detecting wake-up signals over multiple communication channels in sniff processing performed in an implantable medical device (IMD). The architecture includes a direct conversion real receiver configured to scan a selected center channel and a Weaver receiver configured in parallel to the direct conversion real receiver to simultaneously scan side channels, together simultaneously detecting whether a wake-up signal is being received over the center and side channels with minimal power consumption. The architecture further utilizes a falsing protection algorithm that reduces power consumption during sniff operations by inhibiting the sniffing of channels likely to provide a false indication of a wake-up signal based the presence of unwanted signals on those channels. The falsing protection algorithm restricts those channels from sniff processing likely to provide a false indication of a wake-up signal, such that sniff processing can aborted, prevented, limited or otherwise altered to conserve power consumption.