CDR Circuit Lookup Table Equalization for Power Reduction
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Solution Overview
Problem
High power consumption and increased complexity in computer network systems, particularly in high-performance computing and data center communications, due to the need for multiple clock data recovery (CDR) circuits for signal equalization in end-to-end link channels, especially with advanced modulation techniques like PAM-4, which leads to higher latency and footprint requirements.
Innovation Solution
Implementing an end-to-end link channel with optimized placement of CDR circuits and the use of lookup tables for equalization, allowing for pre- and post-equalization of communication data, reducing the number of CDR circuits needed and leveraging feed-forward equalizer coefficients to minimize power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CDR circuits are used for signal equalization in end-to-end link channels, then equalization capability is improved, but power consumption increases
Solution Approach 1:
The patent combines multiple CDR circuits into a single CDR circuit by implementing lookup tables for pre-equalization and post-equalization within the same circuit block. This merging approach maintains the equalization capability of multiple circuits while reducing the total number of physical circuits, thereby lowering power consumption.
Solution Approach 2:
The single CDR circuit is designed to perform multiple functions including pre-equalization, post-equalization, and clock data recovery operations. By making the CDR circuit multi-functional, the system achieves the equalization capabilities of multiple specialized circuits while using only one physical circuit, thus reducing power consumption.
2Reliability
If multiple CDR circuits are used for signal equalization, then equalization performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple CDR circuits into a single integrated circuit that performs pre-equalization, post-equalization, and clock data recovery functions. This reduces the number of discrete circuit components from multiple to one, simplifying the overall device architecture while maintaining equalization performance.
Solution Approach 2:
The single CDR circuit is internally segmented into multiple functional blocks including pre-equalization lookup tables, post-equalization lookup tables, and clock data recovery logic. This segmentation allows the circuit to perform multiple equalization functions while maintaining a unified, simplified external interface and reducing overall device complexity.
3Reliability
If multiple CDR circuits are used for equalization, then signal integrity is improved, but latency increases
Solution Approach 1:
The patent implements pre-equalization lookup tables that perform equalization processing before the main signal processing pipeline. By performing equalization in advance, the system improves signal integrity without adding latency to the critical signal path, as the pre-equalization results are stored and reused.
Solution Approach 2:
The system dynamically adjusts equalization parameters based on channel conditions and signal characteristics. By optimizing equalization settings in real-time, the system achieves high signal integrity with minimal processing overhead, reducing latency while maintaining improved signal quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption and increases equalization capabilities, providing an end-to-end regeneration-free link with improved signal integrity and reduced processing complexity, while maintaining high capacity and low latency in computer network systems.
Implementation Method 1
The first transceiver comprises a photodiode configured to generate an electrical signal based on an optical signal
Implementation Method 2
The second driver circuit is configured to receive the electrical signal from the first transceiver and to modulate a laser source based on the electrical signal to generate an optical signal via the laser source
Data Source
AI summary
Embodiments are disclosed for facilitating an end-to-end link channel with one or more lookup tables for equalization. An example system includes a first transceiver and a second transceiver. The first transceiver includes a clock data recovery (CDR) circuit configured to receive communication data from a switch and to manage a lookup table associated with equalization of the communication data. The first transceiver also includes a first driver circuit communicatively coupled to the CDR circuit and configured to generate an electrical signal associated with the communication data. The second transceiver includes a second driver circuit, communicatively coupled to the first transceiver, that is configured to receive the electrical signal from the first transceiver and to modulate a laser source based on the electrical signal to generate an optical signal via the laser source.