Selectable DEQ Receiver Filtering for Channel-Length ISI Control
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Solution Overview
Problem
Signal integrity in data transmission systems is compromised by factors like limited bandwidth, crosstalk, and dispersion, leading to inter-symbol interference (ISI), which limits transmission distances and data rates, especially in copper-based and optical fiber channels.
Innovation Solution
A digital signal processor (DSP) with a digital equalization (DEQ) filter that selects from multiple filter options based on channel length estimates and coefficients, using a decision circuit, decision-feedback equalizer, gain loop, and clock recovery circuit to optimize signal recovery and reduce ISI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If equalization techniques are used to compensate for ISI and maintain signal integrity, then signal integrity is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic equalization by making the equalizer coefficients adjustable and selectable based on channel conditions. The system dynamically adapts to different channel lengths and characteristics by selecting from multiple preset coefficient sets, allowing the equalization parameters to change according to the actual transmission environment rather than being fixed.
Solution Approach 2:
The patent changes the parameters of the equalization filter by providing multiple preset coefficient sets corresponding to different channel lengths. The system selects appropriate coefficients based on detected channel characteristics, thereby changing the equalization parameters to match the specific transmission conditions and optimize signal integrity for each scenario.
2Manufacturing precision
If digital equalization with selectable filter options is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple sets of equalization coefficients corresponding to different channel lengths before actual operation. During transmission, the system simply selects from these pre-prepared coefficient sets based on the detected channel characteristics, avoiding the need for real-time complex calculations and achieving high precision efficiently.
Solution Approach 2:
The system dynamically selects from multiple preset filter configurations based on channel conditions. By making the equalization parameters selectable and adaptable rather than fixed, the system achieves high manufacturing precision for different channel scenarios while managing complexity through structured coefficient sets.
Data Source
AI summary
A device includes a receiver having analog front-end circuitry and a digital signal processing (DSP) circuit. The DSP circuit is configured to select one of a plurality of digital equalization (DEQ) filter options and to perform DEQ operations based on the selected DEQ filter option, wherein the DSP circuit is configured to select one of the plurality of DEQ filter options based on a channel length estimate and a plurality of different sets of DEQ filter coefficients predetermined for different channel lengths.