Multi-Phase Clock Pulse Generation for Low-Jitter Wideband Sampling
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Solution Overview
Problem
Data centers face challenges in power consumption, jitter, and skew that impact Signal-to-Noise and Distortion Ratio (SNDR) due to the increasing demand for faster communication hardware, necessitating more efficient and wideband clock generation solutions.
Innovation Solution
A wideband multi-phase clock generation system using CMOS tri-state inverters and resettable ring-based dividers, combined with duty-cycle limiters and phase rotators, to generate clocks with less than 100% duty cycle, reducing power consumption and jitter while supporting various data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If clock speed is increased to meet data center bandwidth demands, then communication speed is improved, but power consumption increases
Solution Approach 1:
The patent divides the clock generation into multiple phases (e.g., 5-phase clock signals) where each phase operates at a lower individual frequency but collectively achieves higher data throughput. This segmentation allows parallel processing of data bits across multiple phases, maintaining high communication speed while each phase consumes less power than a single high-frequency clock would require.
Solution Approach 2:
The patent employs periodic switching between different clock phases to handle data transmission. By cycling through multiple phases in a coordinated manner, the system achieves high effective data rates while allowing individual clock circuits to operate at lower frequencies with periodic activation, reducing overall power consumption compared to continuous high-frequency operation.
2Speed
If clock frequency is increased to support faster data rates, then bandwidth is improved, but jitter and skew increase degrading SNDR
Solution Approach 1:
The patent segments the high-speed data transmission across multiple lower-frequency clock phases. Each phase operates with sufficient timing margin to minimize jitter and skew, while the combined effect of multiple phases achieves the required high data rate. This segmentation prevents the jitter and skew problems that would occur with a single high-frequency clock.
Solution Approach 2:
The patent merges multiple lower-frequency clock phases into a unified multi-phase clocking system that collectively supports high-speed data transmission. By combining the timing precision of individual phases with their coordinated operation, the system achieves both low jitter/skew (from individual phase precision) and high data rate (from combined phase capacity).
3Speed
If traditional clock generation methods are used to support high data rates, then bandwidth is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic clock phase switching where not all phases are active simultaneously or continuously. The system dynamically activates only the necessary phases for current data transmission requirements, allowing clock circuits to enter low-power states when not in use. This dynamic operation reduces overall power consumption compared to static traditional clock generation that maintains all clocks at full power.
4Speed
If more clock phases are generated to increase bandwidth, then data rate is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple clock phase generation functions into a single integrated circuit block that produces all phases simultaneously. This unified approach uses shared resources and coordinated logic to generate multiple phases, reducing the overall complexity compared to having separate clock generation circuits for each phase. The merging of functions maintains high bandwidth capability while simplifying the device architecture.
Data Source
AI summary
Aspects of the subject disclosure may include, for example, a track-and-hold sampling circuit, having: a duty-cycle limiter that generates a clock signal having a duty cycle that is less than 100% from three out of four clock signals; and a sampling circuit comprising complementary positive and negative input gates that track and sample data input signals, wherein the sampling circuit generates sampled data signals, wherein the complementary positive and negative input gates are coupled to the clock signal. Other embodiments are disclosed.