Low Power Wake on Radio Circuit with Incremental Decoding
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Solution Overview
Problem
Existing wake on radio systems face issues with erroneous waking due to noise or misdirected RF signals, leading to high battery consumption and inefficiency in detecting intended RF signals.
Innovation Solution
A low power wake on radio system that includes an analog RF sense circuit and digital control logic, using a comparator and programmable resistors for calibration, to accurately detect RF signals and prevent false triggers, employing incremental decoding logic and selective addressing schemes like OOK with preambles and ID sequences to ensure precise waking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wake on radio approaches continuously monitor for RF signals, then detection capability is improved, but battery consumption increases
Solution Approach 1:
The system implements periodic sampling of the RF input signal rather than continuous monitoring. The sampler circuit periodically captures voltage samples from the RF input, allowing the system to detect RF signals while consuming minimal power during idle periods. This periodic action resolves the contradiction by maintaining detection capability while dramatically reducing energy consumption.
Solution Approach 2:
The patent introduces intermediate processing stages including a sampler circuit, comparator, and state machine that act as mediators between the RF input and the main system. These intermediate components filter and condition signals before full system activation, enabling efficient detection without requiring continuous full-power operation of all system components.
2Use of energy by moving object
If wake on radio systems use simple RF detection, then power consumption is reduced, but false triggering from noise increases
Solution Approach 1:
The system employs feedback mechanisms where the state machine monitors comparator outputs over multiple sampling periods and adjusts its state transitions accordingly. The state machine requires multiple consecutive valid detections before triggering a wake event, providing feedback-based filtering that eliminates false positives while maintaining low power operation.
Solution Approach 2:
The patent implements preliminary signal validation through the state machine before triggering a wake event. The state machine performs preliminary analysis of sampled signals, checking for valid RF patterns and filtering out noise bursts. This preliminary action ensures that only genuine RF signals trigger system activation, reducing false triggers while maintaining simple low-power architecture.
3Duration of action of stationary object
If wake on radio circuit remains in low power mode, then battery life is extended, but detection accuracy decreases
Solution Approach 1:
The wake on radio circuit performs self-service by using minimal onboard components (sampler, comparator, state machine) to autonomously detect and validate RF signals while remaining in low-power mode. The system serves its own detection needs without requiring external high-power assistance, maintaining detection accuracy through intelligent use of low-power components and only activating the main system when truly necessary.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces battery consumption by minimizing false triggers and ensuring accurate detection of intended RF signals, maintaining low power usage while prolonging battery life in battery-powered devices.
Implementation Method 1
A comparator has a first comparator input coupled to a drain of the input transistor in an operational mode and has a second comparator input coupled to a reference voltage in the operational mode. The comparator supplies a comparison indication indicating whether the RF signal was detected on the input.
Data Source
AI summary
A low power wake on radio circuit detects if an RF signal is present on an input to the wake on radio circuit. An RF sense circuit supplies an RF sense signal indicating whether the RF signal is present on the input. The RF sense signal is used to incrementally turn on digital decode logic to determine if a radio transmission that is unique to the wake on radio circuit has been received. If the unique radio transmission have been received, the wake on radio circuit supplies a wakeup signal to the rest of the system.