Rotating Data Transmission Device for CT Gantry
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Solution Overview
Problem
Existing non-contacting rotating data transmission devices in computer tomographs are limited in flexibility and data rate capabilities, struggling to maintain high-speed data transmission between movable parts.
Innovation Solution
The implementation of a rotating data transmission device with a contactless data link, utilizing Clock and Data Recovery (CDR) circuits to minimize jitter and adapt to different data rates by generating a stable internal clock through a Phase-Locked Loop (PLL), and optionally including pattern generators and analyzers for link quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional non-contacting data transmission is used in rotating gantries, then data transmission is achieved, but data rate is limited to approximately 1 GBaud and flexibility is reduced
Solution Approach 1:
The system dynamically adapts to different data rates by adjusting the PLL parameters (feedback divider ratio, filter characteristics) based on the actual transmission conditions. This allows the same contactless data link to operate flexibly across a wide range of data rates while maintaining optimal performance through real-time parameter adjustment.
Solution Approach 2:
The invention changes key parameters including implementing CDR circuits to recover clock and data signals, using PLL with adjustable feedback dividers to synchronize with different data rates, and modifying filter characteristics to match different transmission conditions. These parameter changes enable the system to overcome the 1 GBaud limitation while maintaining flexibility.
2Productivity
If higher data rates are transmitted over contactless links, then productivity increases, but signal distortion and jitter increase
Solution Approach 1:
The CDR circuit implements feedback mechanisms where the recovered clock signal is continuously compared with the incoming data stream, and adjustments are made to maintain synchronization. This feedback loop compensates for signal distortion and jitter that increase at higher data rates, maintaining signal quality while enabling higher productivity.
Solution Approach 2:
The invention replaces physical contact-based data transmission with contactless electromagnetic transmission, eliminating mechanical wear and contact-related signal degradation. This substitution enables higher data rates while maintaining reliability through the use of electromagnetic fields rather than physical connectors.
3Reliability
If CDR circuits are added to reduce jitter, then signal quality improves, but device complexity increases
Solution Approach 1:
The CDR functionality is merged with the existing data transmission circuitry rather than being implemented as a separate standalone system. The PLL and clock recovery functions are integrated into the data receiver architecture, sharing common components and signal paths. This merging approach reduces overall device complexity while achieving the desired jitter reduction and signal quality improvement.
Data Source
AI summary
A rotating data transmission device for computer tomographs, for transmission from a rotating part to a stationary part that is rotatably supported relative to the rotating part, comprises at least a rotating high-speed data transmitter unit, a rotating high-speed transmission line, a stationary high-speed data receiver unit. The rotating high-speed data transmitter unit contains a rotating pattern controller and the stationary high-speed data receiver unit contains a stationary data analyzer for analyzing patterns generated by the rotating pattern controller. Furthermore unit controllers are provided to control the units.