Wake-Up Receiver Bandwidth Switching for Sensitive Signal Detection
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Solution Overview
Problem
Conventional wireless receiver designs face challenges in maintaining sensitivity while accommodating wide bandwidth requirements, and lack design flexibility due to fixed operating frequencies, which affects power consumption and adaptability in various wireless communication systems.
Innovation Solution
A novel circuit structure for a wireless receiving device incorporating a wake-up receiver with a calibration circuit that allows for tunable frequency and bandwidth adjustments, using an amplifier circuit, negative resistance device, and variable capacitor to calibrate reception frequency and bandwidth in a background mode, enabling increased sensitivity and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bandwidth of the wake-up receiver is increased to tolerate reception frequency shift, then the frequency tolerance is improved, but the sensitivity is reduced
Solution Approach 1:
The patent implements dynamic bandwidth adjustment by switching between a first bandwidth (first mode) for frequency calibration and a second bandwidth (second mode) for signal reception. The bandwidth is not fixed but adapts based on the operational phase, resolving the contradiction between needing wide bandwidth for frequency tolerance and narrow bandwidth for sensitivity.
Solution Approach 2:
The system periodically alternates between calibration mode (wide bandwidth) and reception mode (narrow bandwidth). During calibration, the receiver uses wide bandwidth to tolerate frequency shifts, then switches to narrow bandwidth for sensitive signal detection, achieving both frequency tolerance and sensitivity through time-division multiplexing.
2Reliability
If the wake-up receiver operates continuously in monitoring mode, then the request signal detection capability is improved, but the power consumption increases
Solution Approach 1:
The wake-up receiver alternates between monitoring mode (detecting request signals) and calibration mode (frequency calibration). This periodic operation allows the receiver to maintain detection capability while reducing overall power consumption by limiting continuous monitoring and incorporating low-power calibration phases.
Solution Approach 2:
The system performs self-calibration during operation without requiring external intervention or full system activation. The wake-up receiver calibrates its own frequency using built-in calibration circuits, eliminating the need for continuous external calibration and reducing power consumption.
3Ease of manufacture
If the operating frequency of the wake-up receiver is fixed after manufacturing, then the circuit design is simplified, but the design flexibility is reduced
Solution Approach 1:
The patent implements a tunable frequency design where the operating frequency can be adjusted after manufacturing through calibration. The receiver frequency can be dynamically tuned to match the transmitter frequency, providing design flexibility while maintaining relatively simple circuit architecture through the use of voltage-controlled oscillators and calibration circuits.
Data Source
AI summary
A wireless receiving device includes a wake-up receiver, a main receiver and a calibration circuit. The wake-up receiver operates in a monitoring mode or a sleep mode. When operating in the monitoring mode, the wake-up receiver monitors whether a request signal is transmitted by a communication device and issues a wake-up signal after receiving the request signal. The main receiver operates in a sleep mode or a transmission mode. When operating in the sleep mode, the main receiver is woken up and enters the transmission mode to transmit and receive data to and from the communication device when receiving the wake-up signal. The calibration circuit is coupled to the wake-up receiver and the main receiver and configured to receive a calibration signal from the main receiver and calibrate a reception frequency of the wake-up receiver in the background in response to the calibration signal.