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Channel Operating Margin Exploration as a Complementary Transceiver Circuit Design Tool for 25 Gbps PAM4 Serial Links
Exploración del margen operativo del canal como herramienta complementaria para el diseño de circuitos transceptores con enlaces seriales PAM4 de 25 Gbps
DOI:
https://doi.org/10.15446/ing.investig.106310Keywords:
COM, Equalizers, IEEE 802.3ck, eye diagram, single-bit response (en)COM, ecualizadores, IEEE 802.3ck, diagrama de ojo, respuesta a único bit (es)
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The design of high-speed serial links continues to attract the attention of the electronics industry due to the steady development of different telecommunications standards, generating a constantly growing data rate and new modulation schemes. However, conventional certification metrics can lead to sub-optimal transmit (Tx) and receive (Rx) circuit designs. Therefore, the Ethernet standard IEEE 802.3bj introduced a more effective evaluation method called channel operating margin (COM) to explore the design space at an early stage. Although the advantages of COM have been discussed in the literature and only a few works explore its potential as a backplane design tool, there are no reports on the use of COM as a complementary design tool for transceiver circuits. This work studies the use of COM as a complementary tool for transceiver design. COM performance is evaluated for four 100GBASE-KP4 backplanes and different equalization architectures. The impact of the metric and the challenges associated with incorporating new equalization structures into the COM flow are discussed. The results reveal a conventional Tx-Rx architecture that exceeds the COM threshold and an alternative one that improves the opening of the eye diagram but does not exceed the threshold.
El diseño de enlaces seriales de alta velocidad continúa atrayendo la atención de la industria electrónica debido al desarrollo constante de diferentes estándares de telecomunicaciones, generando una tasa de datos en constante crecimiento y nuevos esquemas de modulación. Sin embargo, las métricas de certificación convencionales pueden llevar a diseños de circuitos de transmisión (Tx) y recepción (Rx) subóptimos. Por lo tanto, el estándar Ethernet IEEE 802.3bj introdujo un método de evaluación más efectivo llamado margen de operación del canal (COM, por sus siglas en inglés) para explorar el espacio de diseño en una etapa temprana. Aunque las ventajas de COM han sido discutidas en la literatura y solo unos pocos trabajos exploran su potencial como una herramienta de diseño de backplane, no hay informes sobre el uso de COM como una herramienta de diseño complementaria para circuitos transceptores. Este trabajo estudia el uso de COM como una herramienta complementaria para el diseño de transceptores. El rendimiento de COM se evalúa para cuatro backplanes 100GBASE-KP4 y diferentes arquitecturas de ecualización. Se discuten el impacto de la métrica y los desafíos asociados a la incorporación de nuevas estructuras de ecualización en el flujo de COM. Los resultados revelan una arquitectura Tx-Rx convencional que supera el umbral de COM y una alternativa que mejora la apertura del diagrama de ojo pero no supera el umbral de COM.
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Copyright (c) 2024 Luisa Fernanda Dovale-Vargas, Oscar Mauricio Reyes-Torres, Elkim Felipe Roa-Fuentes
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