Receiver Equalizer Calibration Using Run Length Encoding
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Solution Overview
Problem
Existing receiver equalizer technologies face inefficiencies in adjusting filter control signals, leading to over or under compensation issues, especially when dealing with binary sequences of equal low-order and high-order bits, resulting in reduced system efficiency and increased risk of over or under EQ phenomena during repeated data transitions.
Innovation Solution
A device and method utilizing a run length technique to generate run length data, which is used by an adaptive control unit to perform weight calculations and adjust the adaptive filter, ensuring optimal filter compensation by determining the difference between successive low-order and high-order bits to adjust the filter control signal effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adaptive filter continuously adjusts the filter control signal during repeated data transitions, then the compensation effect can be maintained, but over-compensation or under-compensation phenomena occur leading to reduced system efficiency
Solution Approach 1:
The patent implements dynamic adjustment of filter control signals based on real-time detection of data transition patterns. The system adapts its compensation behavior by detecting whether successive bits are identical or different, and adjusts the filter control signal accordingly - increasing adjustment magnitude during transitions and reducing or stopping adjustments during repeated patterns, thereby preventing over-compensation while maintaining compensation accuracy
Solution Approach 2:
The patent employs a feedback mechanism where the system continuously monitors the compensative signal and data transition patterns, then uses this information to adjust subsequent filter control signals. By detecting over-compensation or under-compensation conditions and feeding this information back into the adjustment process, the system optimizes compensation accuracy while avoiding unnecessary adjustments that would reduce system efficiency
2Reliability
If the filter control signal is adjusted quickly to correct under-compensation or over-compensation, then compensation accuracy can be restored, but system stability may be compromised
Solution Approach 1:
The patent implements dynamic adjustment of filter control signals based on real-time detection of data transition patterns. The system adapts its compensation behavior by detecting whether successive bits are identical or different, and adjusts the filter control signal accordingly - increasing adjustment magnitude during transitions and reducing or stopping adjustments during repeated patterns, thereby preventing over-compensation while maintaining compensation accuracy
Solution Approach 2:
The patent applies preliminary anti-action by detecting data transition patterns in advance and preemptively adjusting the filter control signal magnitude. When a data transition is detected, the system prepares appropriate adjustment magnitude before compensation occurs, preventing over-compensation from happening in the first place. This proactive approach maintains stability while ensuring compensation accuracy
Data Source
AI summary
The disclosure is a device and a method for receiver-equalizer calibration, in which the device includes an adaptive filter, a Clock Data Recovery (CDR) unit, an adaptive control unit and a run length encoding unit. The adaptive filter receives a channel signal, calibrates the channel signal according to a filter control signal and compensates the channel signal to obtain a compensative signal. The CDR unit receives the compensative signal to generate a sampling clock signal, a data signal and a transition sampling signal. The run length encoding unit receives the data signal and run-length encodes the data signal to generate first code data and second code data. The adaptive control unit receives the first code data, the second code data, the data signal and the transition sampling signal, and performs weight calculation to adjust the filter control signal.