Clock Synchronization for Analytical Device Modules
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Solution Overview
Problem
Current chromatograph systems face challenges in synchronizing multiple peripheral devices with a master clock using bi-directional differential serial communication, which can lead to timing synchronization difficulties due to the lack of dedicated conductors for timing elements.
Innovation Solution
A system comprising a timing command generator and a command interpreter that generates a timing reference signal to synchronize the local clock of peripheral modules with the master clock, using a bi-directional differential serial communication methodology to adjust the timing output and ensure synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bi-directional differential serial communication methodology is used to minimize conductors, then the number of conductors is reduced and system flexibility is improved, but timing synchronization between peripheral modules and master clock deteriorates due to lack of dedicated timing conductors
Solution Approach 1:
The command signal transmitted through the serial communication conductors serves multiple functions: it carries both data communication and timing reference information. The timing command generator embeds timing reference signals within the command signals, allowing the same conductors to perform both data transmission and timing synchronization, eliminating the need for separate dedicated timing conductors.
Solution Approach 2:
A timing reference signal acts as an intermediary between the master clock and peripheral modules. This timing reference signal is transmitted through the serial communication conductors and serves as a mediator that allows peripheral modules to synchronize their local clocks with the master clock without requiring direct dedicated timing conductors.
2Reliability
If separate conductors are used for timing elements to ensure synchronization, then timing synchronization is improved, but the number of conductors increases and system flexibility is reduced
Solution Approach 1:
The existing serial communication conductors are made multi-functional by embedding timing reference signals within the command signals. This allows the same conductors to carry both data and timing information, eliminating the need for separate dedicated timing conductors while maintaining synchronization capability.
Solution Approach 2:
The timing reference signal transmission is merged with the command signal transmission. Both data and timing information are combined into the same communication channel, reducing the total number of conductors required while maintaining both data communication and timing synchronization functions.
3Reliability
If PC board to PC board connection is used, then fixed spatial relationship ensures timing alignment, but system flexibility and expansion capability are reduced
Solution Approach 1:
The system transitions from a fixed spatial relationship (PC board to PC board connection) to a dynamic communication-based synchronization. Peripheral modules can be positioned flexibly in space while maintaining timing alignment through the dynamic transmission of timing reference signals via serial communication, allowing the system to adapt to different configurations and expansions.
Solution Approach 2:
The mechanical connection system (PC board to PC board physical connection enforcing fixed spatial relationship) is replaced with an electrical communication system that transmits timing reference signals. This substitution allows timing synchronization to be maintained through software/firmware control rather than physical constraints, greatly increasing system flexibility and expansion capability.
Data Source
AI summary
A system for synchronizing clock signals in an analytical device includes a first module including a timing command generator configured to generate a command signal, the command signal related to a master clock signal, and a second module including a command interpreter configured to generate a timing reference signal related to the command signal and a local clock signal. The second module includes a clock generator configured to receive the timing reference signal and the local clock signal and is configured to adjust a timing output of the second module so that the timing of the second module is synchronized to the master clock signal.