SerDes Crosstalk Cancellation via Adaptive FIR Filters
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Solution Overview
Problem
High-speed serializer-deserializer (SerDes) links face issues such as inter-symbol interference (ISI), signal echoes, and signal crosstalk, particularly in architectures with multiple adjacent links operating at high speeds, which existing technologies have not effectively addressed without increasing circuit complexity.
Innovation Solution
The implementation of cross-coupled crosstalk cancellation circuitry using adaptive finite impulse response (FIR) filters and feed-forward or feedback crosstalk cancellation architectures, which adapt to minimize crosstalk between SerDes links, thereby allowing operation at higher data rates with reduced circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple adjacent SerDes links operate at very high speeds, then data transmission rate is improved, but signal crosstalk and inter-symbol interference worsen
Solution Approach 1:
The patent captures the harmful crosstalk signal and converts it into a useful reference input for the adaptive filter. By using the actual crosstalk waveform from adjacent links as the filter input, the system transforms a detrimental interference into a beneficial reference signal that enables precise cancellation through adaptive filtering.
Solution Approach 2:
The patent introduces an adaptive filter as an intermediary component between the crosstalk source and the victim SerDes link. This filter acts as a mediator that processes the crosstalk signal and generates a cancellation signal, which is then combined with the received signal to eliminate the harmful interference.
2Reliability
If traditional crosstalk cancellation methods are implemented, then signal quality is improved, but circuit complexity increases
Solution Approach 1:
The patent employs adaptive filtering techniques that dynamically adjust filter coefficients based on the actual crosstalk characteristics. This parameter adaptation allows the system to achieve effective crosstalk cancellation with a relatively simple filter structure, avoiding the need for complex fixed-structure cancellation circuits while maintaining signal quality.
Data Source
AI summary
A serializer-deserializer (SerDes) integrated circuit (IC) chip includes a first SerDes receiver circuit having a first input for coupling to a first SerDes link, and a first output. A second SerDes receiver circuit has a second input for coupling to a second SerDes link. The second SerDes receiver circuit includes a second output. Crosstalk filter circuitry is disposed between the first SerDes receiver circuit and the second SerDes receiver circuit.