Segmented Signal Equalizer Control for Jitter and SNR Stability

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Solution Overview

Problem

Conventional equalizers face challenges in maintaining optimal operating characteristics such as output jitter, compensation for process and temperature variations, and signal-to-noise ratio (SNR) when dealing with high data rate signals over long cable lengths, due to complexity and difficulty in adapting to varying cable lengths and data rates.

Innovation Solution

An adaptive signal equalizer with separate equalization boost and amplitude control loops, using initial binary search to reduce data points, and segmented linear equalization for optimal performance across multiple channels, with distinct filter bandwidths for high and low data rates to minimize crosstalk and improve noise performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional equalizers use gm/C continuous time filters or FIR filters, then filtering function is provided, but device complexity increases and difficulty in maintaining balance among operating characteristics worsens

Engineering Contradiction:

Improveease of implementing filtering functionVSAvoidcomplexity of filter structure

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The equalizer is divided into multiple independent filter banks, each handling specific frequency ranges or data rates. This segmentation allows each filter bank to be simpler in structure while collectively providing comprehensive equalization functionality, resolving the contradiction between ease of implementation and device complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The filter structure employs dynamic element selection where filter banks are enabled or disabled based on detected data rate and cable length conditions. This dynamic approach allows the system to use only necessary filter components for each operating condition, reducing overall device complexity while maintaining manufacturing ease.

Inventive Principle:

Principle #15Dynamics

2Device complexity

If conventional equalizers use single filter structure, then simplicity is maintained, but adaptability to varying cable lengths and data rates deteriorates

Engineering Contradiction:

Improvesimplicity of filter structureVSAvoidadaptability to cable length and data rate variations

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

Multiple filter banks are designed with universal control mechanisms that allow the same physical structure to serve different functions based on operating conditions. Each filter bank can be activated for specific data rates or cable lengths, providing universal adaptability while maintaining relatively simple individual filter structures.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system changes operational parameters such as filter bank selection, gain values, and bandwidth settings based on detected cable length and data rate. This parameter-based adaptation allows a single physical filter structure to effectively become multiple specialized filters, enhancing versatility without increasing structural complexity.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If conventional equalizers lack segmented control, then control simplicity is maintained, but precision in maintaining output jitter and SNR deteriorates

Engineering Contradiction:

Improvesimplicity of control mechanismVSAvoidprecision of output jitter and SNR control

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The control mechanism is segmented into coarse control and fine control stages. Coarse control selects appropriate filter banks and basic gain settings, while fine control precisely adjusts output jitter and SNR parameters. This segmented approach maintains operational simplicity while achieving high precision control through hierarchical adjustment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system implements feedback loops that continuously monitor output jitter and SNR measurements, then adjust filter bank selections and gain parameters accordingly. This feedback mechanism enables precise control of critical parameters while keeping the control interface simple, as the system automatically makes fine adjustments based on measured performance.

Inventive Principle:

Principle #23Feedback

4Ease of manufacture

If conventional equalizers use automatic gain control, then amplitude control is provided, but power consumption and thermal noise increase

Engineering Contradiction:

Improveease of implementing amplitude controlVSAvoidpower consumption and thermal noise

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The automatic gain control function is extracted and replaced with a digital amplitude adjustment mechanism that operates on the digital signal after filtering. This extraction removes the need for high-power analog gain control circuits, significantly reducing power consumption and thermal noise while maintaining amplitude control capability through digital signal processing.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS8588289B2Adaptive signal equalizer with segmented coarse and fine controls

Publication Date: 2013.11.19 NAT SEMICON CORP

AI summary

Circuitry for adaptive signal equalizing with coarse and fine boost controls by providing multiple serially coupled stages of parallel controllable DC and AC signal gains with coarse and fine gain controls provided across all stages.