Re-Timer Isolated Data Path for High-Speed Jitter Control
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Solution Overview
Problem
Existing signal isolation methods, such as re-driver approaches, exacerbate jitter and cable loss at high data rates, particularly in applications like endoscopy, where high-voltage isolation is required.
Innovation Solution
An isolated repeater architecture using a re-timer with a separated equalizer and CDR subsystem, coupled by an isolator, addresses signal loss and jitter through regenerative signal processing and adaptive equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a re-driver approach is used for signal isolation, then signal transmission is maintained, but jitter and cable loss are exacerbated at high data rates
Solution Approach 1:
The system is divided into two isolated subsystems: an equalizer on a first substrate and a CDR subsystem on a second substrate, separated by a galvanic isolator. This segmentation allows each subsystem to perform its function independently while maintaining signal isolation, preventing jitter and cable loss from affecting the entire system.
Solution Approach 2:
A galvanic isolator serves as an intermediary component between the equalizer and CDR subsystem, enabling signal transmission while blocking the propagation of harmful effects such as jitter and cable loss. The isolator maintains galvanic isolation while allowing the equalized signal to pass through to the CDR subsystem.
2Reliability
If galvanic isolation is implemented between equalizer and CDR subsystem, then high-voltage isolation is achieved, but system complexity increases
Solution Approach 1:
The system is divided into two isolated subsystems: an equalizer on a first substrate and a CDR subsystem on a second substrate, separated by a galvanic isolator. This segmentation allows each subsystem to perform its function independently while maintaining signal isolation, preventing jitter and cable loss from affecting the entire system.
3Loss of energy
If signal loss is addressed through equalization, then insertion loss is mitigated, but jitter performance deteriorates
Solution Approach 1:
The system is divided into two isolated subsystems: an equalizer on a first substrate and a CDR subsystem on a second substrate, separated by a galvanic isolator. This segmentation allows each subsystem to perform its function independently while maintaining signal isolation, preventing jitter and cable loss from affecting the entire system.
Solution Approach 2:
A galvanic isolator serves as an intermediary component between the equalizer and CDR subsystem, enabling signal transmission while blocking the propagation of harmful effects such as jitter and cable loss. The isolator maintains galvanic isolation while allowing the equalized signal to pass through to the CDR subsystem.
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
The isolated repeater effectively mitigates insertion loss and jitter, ensuring compliance with low bit error rates, even at high data rates, while maintaining galvanic isolation.
Implementation Method 1
Galvanic isolation refers to energy flow between two circuit via a field rather than via electrical connections. Galvanic isolation provides signal isolation and power isolation and facilitates the flow of analog and digital signals, as well as power, between components at different ground potentials.
Implementation Method 2
enhancing isolation in on-chip piezoelectric-based isolators
Data Source
AI summary
Aspects of a re-timer-based isolator provide galvanic isolation between a first side of a system including a high voltage source and a second side of the system that may contact a person. An equalizer arranged with a physical layer on a first substrate is isolated from re-timer components arranged on a second substrate.