Switched Bleed Currents for Low-ISI Multiplexer Sampling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In coherent optical communication systems, high-speed data conversion between digital and analog signals is challenging due to jitter and intersymbol interference (ISI), which degrades signal accuracy and requires high-power consumption, especially when distributing clocks across distances and demultiplexing signals into multiple parallel paths.
Innovation Solution
The method involves using switched DC bleed currents to maintain a constant multiplexer current and cancel out common-mode currents, allowing for fast settling and reduced ISI, thereby enabling low-power, high-performance front-end circuits for high-speed analog-to-digital converters and distributing clocks without significant power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed data conversion is implemented to improve signal processing capability, then signal accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic switching of bleed currents at specific time intervals (even and odd branches at different sets of times) to maintain constant multiplexer current. This periodic action reduces intersymbol interference and improves signal accuracy while consuming less power compared to continuous high-power operation.
Solution Approach 2:
The patent changes the timing parameters of bleed current application, switching between even and odd branches at different time sets. This parameter change optimizes the balance between signal accuracy and power consumption by applying bleed currents only when needed in each branch.
2Productivity
If clock distribution across distances is implemented to enable high-speed data conversion, then data conversion capability is improved, but power dissipation increases
Solution Approach 1:
The patent segments the clock distribution system into even and odd branches with separate bleed current paths. This segmentation allows independent optimization of each branch, reducing overall power dissipation while maintaining high-speed data conversion capability across distributed clock networks.
3Productivity
If demultiplexing into multiple parallel paths is implemented to improve signal processing, then signal processing capability is improved, but intersymbol interference increases
Solution Approach 1:
The patent applies preliminary bleed currents to the even and odd branches before signal transmission. This preliminary action prepares the transmission paths by establishing constant multiplexer current, which reduces intersymbol interference and improves signal processing capability in parallel paths.
Solution Approach 2:
The patent converts the potentially harmful effect of idle current paths into a benefit by applying switched bleed currents that actively maintain constant multiplexer current. This transforms what could be sources of interference into elements that reduce intersymbol interference and improve signal integrity.
Data Source
AI summary
A method, system, and apparatus for multiplexing comprising feeding a signal into a sampler, splitting a first signal into an even branch at a first set of times, splitting a second signal into an odd branch at a second set of times, feeding a switch bleed current into the first branch at the second set of time and feeding the switch bleed current into the second branch at the first set of time.