RFID Oscillator Frequency Tuning for Power and Stability
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Solution Overview
Problem
RFID oscillator backscatter link frequency (BLF) is often out of threshold range, leading to unstable signal processing, especially in long distance environments, due to high power consumption when operating at higher frequencies like 1.92 MHz, and low power consumption at 1.28 MHz, which affects performance.
Innovation Solution
An oscillator tuning system that adaptively adjusts the driving frequency of the RFID oscillator based on the power strength and distance from the RFID reader, distinguishing between near and far field regions to maintain BLF within a threshold range, reducing power consumption and enhancing performance in long distance environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driving frequency of the RFID oscillator is increased to 1.92 MHz, then the backscatter link frequency remains within threshold range in all regions, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic frequency tuning by switching between 1.28 MHz and 1.92 MHz driving frequencies based on detected signal strength or distance conditions. The determination unit detects whether the RFID tag is in near-field or far-field region, and the frequency tuner adjusts the oscillator frequency accordingly, making the system adaptive rather than static.
Solution Approach 2:
The patent changes the operating parameter (driving frequency) of the RFID oscillator based on environmental conditions. By detecting signal strength or distance and comparing with reference values, the system selects appropriate frequency parameters (1.28 MHz for far-field, 1.92 MHz for near-field) to optimize both power consumption and frequency stability.
2Use of energy by moving object
If the driving frequency is set to 1.28 MHz, then power consumption is reduced, but the backscatter link frequency falls outside threshold range in some regions
Solution Approach 1:
The system dynamically adjusts the driving frequency based on real-time detection of signal strength or distance conditions. When the determination unit detects far-field conditions (weak signal or large distance), it selects 1.28 MHz for low power consumption. When near-field conditions are detected (strong signal or small distance), it switches to 1.92 MHz to ensure frequency stability within threshold range.
Solution Approach 2:
The patent implements parameter adaptation by changing the driving frequency parameter according to operational conditions. The frequency tuner modifies the oscillator frequency between 1.28 MHz and 1.92 MHz based on the determination unit's assessment of signal strength or distance, optimizing the trade-off between power consumption and frequency stability for each specific operating scenario.
3Reliability
If a fixed high frequency of 1.92 MHz is used, then the backscatter link frequency is within threshold in all regions, but signal processing performance deteriorates in long distance environments due to high power consumption
Solution Approach 1:
The patent implements dynamic frequency selection based on distance or signal strength detection. For far-field conditions (long distance), the system selects 1.28 MHz to reduce power consumption and improve signal processing performance. For near-field conditions (short distance), it selects 1.92 MHz to ensure frequency threshold compliance, thereby adaptively optimizing performance for each operational scenario.
Solution Approach 2:
The system changes the driving frequency parameter based on detected operational conditions. The determination unit compares signal strength or distance measurements with reference values to determine whether far-field or near-field conditions exist, then the frequency tuner adjusts the oscillator frequency accordingly to optimize both threshold compliance and signal processing performance.
4Use of energy by moving object
If a fixed low frequency of 1.28 MHz is used, then power consumption is low, but the system cannot stably process signals in all regions
Solution Approach 1:
The patent implements dynamic frequency adjustment based on detected regional conditions. The determination unit identifies whether the RFID tag operates in near-field or far-field region by comparing signal strength or distance with reference values, and the frequency tuner switches between 1.28 MHz and 1.92 MHz accordingly, enabling the system to adapt to different operational regions and maintain signal processing stability.
Solution Approach 2:
The system adapts the driving frequency parameter based on operational region detection. When far-field conditions are detected, 1.28 MHz is selected for low power consumption. When near-field conditions are detected, 1.92 MHz is selected to ensure stable signal processing, thereby achieving both power efficiency and regional adaptability through parameter adaptation.
Data Source
AI summary
An oscillator tuning system and an oscillator tuning method are provided. The system includes a determination unit which determines whether a power which is used in an RFID tag having an RFID oscillator is greater than a reference value; and a frequency tuner which tunes a driving frequency of the RFID oscillator according to a result of the determination. The method includes determining whether a power which is used in an RFID tag having an RFID oscillator is greater than a reference value; and tuning a driving frequency of the RFID oscillator according to a result of the determination.