Transponder Clock Synchronization During Modulation Pause
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional transponder systems, especially active ones, face clock discrepancies during data transmission due to the absence of a clock signal from the reader, leading to disturbances in contactless data transmission.
Innovation Solution
A transponder unit equipped with a clock generator that synchronizes its clock signal with the reader's signal during a modulation pause, using a modulator to generate a modulation pause and send a signal for synchronization, ensuring a stable clock frequency and phase alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the transponder uses its own oscillator in transmission mode, then the transponder can operate independently without a clock signal from the reader, but clock discrepancies occur during long transmission times leading to data transmission disturbances
Solution Approach 1:
The patent implements periodic clock synchronization during transmission mode by inserting synchronization markers at regular intervals in the data stream. The clock generator periodically adjusts its frequency based on these markers, creating a rhythmic correction pattern that maintains synchronization over long transmission periods without requiring continuous external clock signals.
Solution Approach 2:
The system employs feedback mechanisms where the transponder monitors its own transmitted data against the received acknowledgment signals from the reader. Based on this feedback, the clock generator dynamically adjusts its oscillation frequency to compensate for drift, ensuring that clock discrepancies do not accumulate to problematic levels during extended transmission sessions.
2Measurement precision
If the transponder derives clock from reader in reception mode, then clock synchronization is maintained, but the transponder cannot operate in transmission mode without its own clock generator
Solution Approach 1:
The clock generator is designed to perform multiple functions: it can derive clock from the reader during reception mode, generate independent clock during transmission mode, and periodically synchronize during transmission mode. This multi-functionality allows a single component to adapt to different operational requirements without requiring separate clock sources for each mode.
Solution Approach 2:
The clock generation system is made dynamic by enabling it to switch between different operating states based on mode requirements. In reception mode, it locks to the reader's clock frequency; in transmission mode, it operates independently but with periodic synchronization capability. This dynamic adaptability resolves the contradiction between maintaining precision and enabling independent operation.
Data Source
AI summary
A transponder unit for the contactless transmission of modulated data to a reader is provided. The transponder unit includes a clock generator configured to generate a clock signal and to synchronize the clock signal in a synchronization mode, on the basis of a signal received from the reader, and a modulator, the modulator configured to modulate data on the basis of the clock signal from the clock generator. The modulator is configured to generate a modulation pause by masking out at least one modulation component, the modulation component being smaller than a modulation pulse. The modulator is further configured to send the signal for starting the synchronization mode to the clock generator during this modulation pause.