Half-Rate Decision Feedback Equalizer Power Reduction

Solution Overview

Problem

Half-rate decision feedback equalizers in high-speed data transmission systems face challenges of high power consumption and large size due to the use of multiple acquisition components, which are not effectively addressed by existing solutions.

Innovation Solution

A decision feedback equalizer comprising two decision sampling circuits operating with opposite sampling clock signals, where each circuit determines a correction mode based on previous sampling results to correct sampling data, reducing the need for multiple acquisition components and thereby lowering power consumption and circuit size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a half-rate decision feedback equalizer uses multiple acquisition components to handle odd and even channels separately, then the sampling frequency can be reduced to half of the data stream frequency, but the power consumption and circuit area increase significantly

Engineering Contradiction:

Improvesampling frequencyVSAvoidpower consumption

Core Design Contradiction:

SpeedVSUse of energy by stationary object

Solution Approach 1:

The patent merges the odd channel and even channel processing into a unified half-rate decision feedback equalizer structure. By using a single acquisition component that processes both channels through time-interleaved sampling, the design eliminates the need for separate acquisition components for each channel, thereby reducing power consumption while maintaining half-rate operation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The acquisition component is designed to perform multiple functions by handling both odd and even channel sampling sequences. The same component alternates between sampling odd and even channels at different time intervals, making it a universal component that replaces what would traditionally require two separate components, thus reducing overall power consumption.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Speed

If a half-rate decision feedback equalizer uses multiple acquisition components to handle odd and even channels separately, then the sampling frequency can be reduced to half of the data stream frequency, but the circuit area increases

Engineering Contradiction:

Improvesampling frequencyVSAvoidcircuit area

Core Design Contradiction:

SpeedVSArea of stationary object

Solution Approach 1:

The patent merges the odd channel and even channel processing into a unified half-rate decision feedback equalizer structure. By using a single acquisition component that processes both channels through time-interleaved sampling, the design eliminates the need for separate acquisition components for each channel, thereby reducing circuit area while maintaining half-rate operation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The acquisition component is designed to perform multiple functions by handling both odd and even channel sampling sequences. The same component alternates between sampling odd and even channels at different time intervals, making it a universal component that replaces what would traditionally require two separate components, thus reducing overall circuit area.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If a full-rate decision feedback equalizer is used to eliminate Inter-Symbol Interference, then the signal integrity is improved, but the time sequence design requirements become very strict, causing increased design cost and difficulty

Engineering Contradiction:

Improvesignal integrityVSAvoidtime sequence design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent changes the sampling rate parameter from full-rate to half-rate operation. By sampling at half the data stream frequency and using time-interleaved processing for odd and even channels, the system maintains signal integrity for ISI elimination while relaxing the time sequence design requirements, thereby reducing design complexity and cost.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12126470B2Decision feedback equalizer and method for acquiring and correcting data

Publication Date: 2024.10.22 ANALOGIX SEMICON (SUZHOU) INC

AI summary

The present disclosure discloses a decision feedback equalizer and a method for acquiring and correcting data. The decision equalizer comprises: a first decision sampling circuit; and a second decision sampling circuit; wherein an input end of the first decision sampling circuit is configured to receive sampling data and a first sampling result outputted by the second decision sampling circuit in a previous sampling period; and an input end of the second decision sampling circuit is configured to receive sampling data and a second sampling result outputted by the first decision sampling circuit in a previous sampling period.