Pattern-Detecting Data Transmission Circuit for Crosstalk Jitter

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Solution Overview

Problem

High-speed data transmission is hindered by jitter effects, particularly cross talk, which causes errors due to capacitance between adjacent lines, especially in two-aggressors and one-victim patterns, leading to increased jitter and difficulty in data change.

Innovation Solution

A data transmission circuit and system that includes a pattern detection unit to identify data patterns and generate an inversion signal, inverting data on inner lines when necessary, and a transmission unit to transmit this signal along with data, thereby reducing cross talk-induced jitter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If data is transmitted at high speed on parallel lines, then transmission speed is improved, but cross talk between adjacent lines increases causing jitter and errors

Engineering Contradiction:

Improvedata transmission speedVSAvoidcross talk

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The pattern detection unit detects potential two-aggressors and one-victim patterns before data transmission occurs. When such a pattern is detected, the inversion control unit proactively inverts the data on the victim line before it is transmitted, preventing the cross talk-induced jitter from occurring in the first place. This preliminary intervention resolves the contradiction by eliminating the harmful effect before it can manifest during high-speed transmission.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention applies logical inversion to the data signal on the victim transmission line. When a two-aggressors and one-victim pattern is detected, the data on the victim line is inverted (0 becomes 1, 1 becomes 0) before transmission. This inversion changes the voltage transition characteristics, preventing the capacitive coupling effect that causes cross talk. The receiver then inverts the data again to restore the original information, effectively eliminating the harmful cross talk effect while maintaining high-speed transmission.

Inventive Principle:

Principle #13The other way round (Inversion)

2Object-affected harmful factors

If data pattern causes two-aggressors and one-victim scenario, then cross talk effect is maximized, but data transmission reliability deteriorates

Engineering Contradiction:

Improvecross talk effectVSAvoiddata transmission reliability

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention converts the harmful two-aggressors and one-victim pattern into a beneficial state by detecting this specific pattern and applying data inversion. The pattern that would normally cause maximum cross talk and jitter is identified, and the victim line's data is inverted to create a different voltage transition pattern that eliminates the harmful capacitive coupling. This transforms the problematic pattern into a safe transmission state, maintaining reliability while allowing high-speed operation.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The system implements feedback through the pattern detection unit that continuously monitors the data patterns on adjacent transmission lines. When a two-aggressors and one-victim pattern is detected, this feedback triggers the inversion control unit to invert the victim line's data. This closed-loop feedback mechanism ensures that cross talk-induced jitter is prevented dynamically based on the actual transmission conditions, maintaining data reliability throughout the transmission process.

Inventive Principle:

Principle #23Feedback

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 solution effectively reduces jitters caused by cross talk, enabling stable high-speed data transmission by preventing two-aggressors and one-victim patterns on transmission lines, thus minimizing errors.

Implementation Method 1

The cross talk occurs due to a capacitance generated between adjacent lines.

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

invert some of the data to be loaded on the inner lines in response to the inversion signal

Methodology Applied

Scientific EffectVoltage level inversion:

Implementation Method 3

The data reception circuit is configured to invert the data inverted by the transmission unit among the data transferred to the plurality of transmission lines, in response to the inversion signal

Methodology Applied

Scientific EffectVoltage level detection:

Data Source

PatentUS8891346B2Data transmission circuit and data transmission/reception system with reduced jitter

Publication Date: 2014.11.18 SK HYNIX INC

AI summary

A data transmission/reception system includes a data transmission circuit and a data reception circuit. The data transmission circuit includes a pattern detection unit configured to detect a pattern of data to be loaded on inner lines among a plurality of transmission lines and generate an inversion signal, and a transmission unit configured to transmit data to the plurality of transmission lines and the inversion signal to an inversion line, and invert some of the data to be loaded on the inner lines in response to the inversion signal. The data reception circuit is configured to invert the data inverted by the transmission unit among the data transferred to the plurality of transmission lines, in response to the inversion signal.