RFID Tag Clock Frequency Adjustment for Power Conservation
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Solution Overview
Problem
Passive RFID tags face challenges in power conservation due to higher internal clock frequencies, which result in increased power consumption and limited operational capabilities.
Innovation Solution
The RFID tag dynamically adjusts its clock frequency based on timing parameters during the command reception and backscattering process, allowing it to conserve power while maintaining accurate frequency alignment with reader commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the RFID tag uses a higher internal clock frequency to achieve more backscatter frequency options, then the frequency alignment accuracy is improved, but the power consumption increases
Solution Approach 1:
The RFID tag dynamically adjusts its internal clock frequency based on the specific backscatter frequency requirements of different commands. Instead of using a fixed high frequency, the tag switches between different clock frequencies (e.g., first and second clock frequencies) depending on the command type and timing parameters, thereby reducing average power consumption while maintaining frequency alignment accuracy when needed.
Solution Approach 2:
The system changes the operating parameter (clock frequency) of the RFID tag based on the command characteristics. The tag determines which clock frequency to use by evaluating timing parameters from the reader commands, allowing optimal frequency selection that balances power consumption and frequency precision for each specific operation.
2Measurement precision
If the RFID tag operates continuously at high clock frequency to maintain frequency accuracy, then the backscatter frequency precision is improved, but the operational lifespan decreases
Solution Approach 1:
The RFID tag employs periodic frequency adjustments based on command timing parameters. Rather than maintaining high frequency continuously, the tag periodically switches between different clock frequencies according to the specific timing requirements of incoming commands, extending operational lifespan while ensuring precision is maintained during critical backscatter periods.
Solution Approach 2:
The system dynamically adapts the clock frequency based on operational needs, switching between high and low frequency states. This dynamic adjustment allows the tag to maintain backscatter frequency precision when required while reducing power consumption and extending operational lifespan during periods when maximum precision is not critical.
3Device complexity
If the RFID tag uses fixed clock frequency to simplify operation, then the device complexity is reduced, but the adaptability to different reader commands decreases
Solution Approach 1:
The RFID tag implements dynamic clock frequency selection based on command timing parameters. The tag evaluates the timing characteristics of received commands and automatically determines the appropriate clock frequency to use, providing adaptability to different reader commands without requiring complex manual configuration or excessive hardware complexity.
Solution Approach 2:
The system enables the RFID tag to self-determine the appropriate clock frequency by analyzing timing parameters from the reader commands. This self-service mechanism allows the tag to adapt to different operational requirements autonomously, balancing adaptability with reasonable device complexity through intelligent frequency selection algorithms.
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 enables the RFID tag to minimize power consumption while ensuring accurate backscattering frequencies, thereby extending its operational lifespan and efficiency in data transmission.
Implementation Method 1
RFID techniques entail using an RFID reader to interrogate one or more RFID tags. The reader transmitting a Radio Frequency (RF) wave performs the interrogation. The RF wave is typically electromagnetic, at least in the far field.
Implementation Method 2
A tag that senses the interrogating RF wave responds by transmitting back another RF wave. The tag generates the transmitted back RF wave either originally, or by reflecting back a portion of the interrogating RF wave in a process known as backscatter.
Data Source
AI summary
An RFID tag is configured to adjust its current clock frequency to conserve tag power while receiving a reader signal and/or backscattering a signal. The tag may determine whether to adjust its current clock frequency based on one or more timing parameters, which may be determined from a reader command and/or from a signal to be backscattered. The counting rate and/or limit of a tag counter and/or the power supplied to a tag component may also be adjusted. The current tag clock frequency may be adjusted during the signal reception/backscattering process and optionally restored once the process is completed.