Wakeup Receiver Verification for Low-Power UWB IoT Circuits
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Solution Overview
Problem
Conventional UWB receiver circuits require additional narrowband radio circuits for detecting wakeup signals, increasing footprint and power consumption, which is undesirable for IoT devices.
Innovation Solution
A receiver circuit with a main receiver and a wakeup receiver, where the wakeup receiver detects and verifies a wakeup impulse sequence to wake up the main receiver, incorporating a verification step to prevent false detections and minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a narrowband radio circuit is added to detect wakeup signals, then the receiver circuit can detect wakeup signals, but the footprint and power consumption increase
Solution Approach 1:
The receiver circuit is segmented into two distinct circuits: a main receiver circuit for UWB data communication and a separate wakeup receiver circuit for detecting wakeup signals. This segmentation allows each circuit to be optimized independently, with the wakeup receiver consuming minimal power while the main receiver remains asleep during idle periods.
Solution Approach 2:
The wakeup signal detection function is extracted from the main receiver circuit and implemented as a standalone wakeup receiver circuit. This extraction eliminates the need for the main receiver to remain active or have additional narrowband radio circuitry, significantly reducing overall power consumption while maintaining wakeup detection capability.
2Speed
If the main receiver circuit stays awake to detect wakeup signals, then detection is immediate, but power consumption increases significantly
Solution Approach 1:
The wakeup receiver circuit is kept in a low-power standby state with preliminary detection capabilities, allowing it to immediately detect wakeup signals without requiring the main receiver circuit to be fully active. This preliminary action enables fast wakeup detection while keeping the main receiver in sleep mode.
Solution Approach 2:
The wakeup receiver circuit acts as an intermediary between the external wakeup signals and the main receiver circuit. It detects wakeup signals and conditions for activation, then triggers the main receiver only when necessary, eliminating the need for the main receiver to continuously monitor for wakeups.
3Reliability
If the wakeup receiver activates the main receiver on every detected signal, then no wakeup is missed, but false positives cause unnecessary activation
Solution Approach 1:
The wakeup receiver circuit incorporates feedback mechanisms to verify detected signals before activating the main receiver. It monitors signal characteristics, timing, and patterns to confirm genuine wakeup signals, providing feedback that prevents false activations while ensuring legitimate wakeups are captured.
Solution Approach 2:
The wakeup receiver circuit performs preliminary verification of detected signals against predefined wakeup criteria before triggering the main receiver. This preliminary action filters out false positives such as noise or invalid signal patterns, ensuring only authenticated wakeup signals activate the power-consuming main receiver.
Data Source
AI summary
A receiver circuit for detecting and waking up a wakeup impulse sequence is provided. Herein, a transmitter circuit is configured to transmit a wakeup impulse sequence to wake up a receiver circuit. The receiver circuit includes a main receiver circuit and a wakeup receiver circuit. The main receiver circuit, which consumes far more energy than the wakeup receiver circuit, will remain in sleep mode as much as possible to conserve power. While the main receiver circuit is asleep, the wakeup receiver circuit is configured to detect the wakeup impulse sequence and wake up the main receiver circuit if the wakeup impulse sequence is intended for the receiver circuit. By keeping the main receiver circuit asleep as much as possible, it is possible to reduce power consumption, thus making the receiver circuit an ideal receiver option for an Internet-of-Things (IoT) device(s).