Charge Pump Signal Detection for Wireless IoT
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Solution Overview
Problem
Demodulating amplitude-modulated wireless signals at battery-less devices, such as IoT-type devices, poses challenges due to varying power levels, distance, and environmental factors, which complicates the design of envelope detector circuits for reliable signal detection.
Innovation Solution
The implementation of differential charge pump/rectifier circuits in amplitude-modulated signal detection circuits, allowing for improved sensitivity and longer-range operation with reduced power consumption, and the use of multiple charge pump stages with tunable characteristics to adapt to varying RF signal amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional passive filter schemes are used for signal detection, then device complexity is reduced, but sensitivity and detection reliability deteriorate under varying power levels and distances
Solution Approach 1:
The patent employs multiple charge pump stages with different time constants to detect different signal amplitude ranges. By dynamically selecting and switching between charge pump circuits based on detected signal strength, the system adapts its parameters to maintain optimal detection sensitivity across varying RF signal conditions while managing circuit complexity through selective activation.
2Adaptability or versatility
If multiple charge pump stages with different time constants are implemented, then sensitivity and adaptability improve, but device complexity increases
Solution Approach 1:
The system dynamically switches between different charge pump circuits based on the detected signal amplitude. The envelope detector monitors the RF signal strength and activates appropriate charge pump stages with matching time constants, enabling the circuit to adapt its characteristics in real-time to varying signal conditions without requiring all circuits to operate simultaneously.
Solution Approach 2:
The detection circuit is divided into multiple segmented charge pump stages, each optimized for specific signal amplitude ranges. This segmentation allows the system to handle different signal strengths independently, improving overall adaptability while managing complexity by only activating the necessary segments for current operating conditions.
3Measurement precision
If charge pump circuits are used to amplify weak signals, then sensitivity improves, but power consumption increases
Solution Approach 1:
The system applies charge pump amplification selectively rather than continuously. By using the charge pump circuits only when weak signals are detected and switching to simpler detection modes for stronger signals, the system achieves high sensitivity when needed while minimizing unnecessary power consumption during normal operating conditions.
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
This approach enhances the reliability and sensitivity of signal detection, enabling correct demodulation of RF signal packets across a wider range of conditions and reducing power consumption, as demonstrated by successful demodulation at lower received signal powers compared to traditional passive filter schemes.
Implementation Method 1
at least first and second charge pumps to amplify an amplitude-modulated signal to generate at least first and second detector input signals
Implementation Method 2
a detector to detect an envelope of the amplitude-modulated signal based at least in part on the at least the first and second detector input signals
Data Source
AI summary
Subject matter disclosed herein may relate to detecting wireless signals and/or signal packets and may relate more particularly to detecting wireless signals and/or signal packets at energy-harvesting devices.