Rotary Resonant Clock Architecture for Low-Skew GPU Timing
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Solution Overview
Problem
Existing clocking architectures in graphics processing units (GPUs) face challenges with clock design complexity due to multi-die, multi-process, and low latency requirements, necessitating a robust, low-power, low-skew, and low-jitter solution that can be scaled across various product segments.
Innovation Solution
Implementing resonant rotary clocking architectures using rotary traveling wave oscillators (RTWOs) and oscillator arrays (ROAs) with fractional dividers and custom reset synchronizers, distributed across backside metal layers, to generate and distribute low-skew, low-jitter, and low-power clocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clocking architectures are used in GPUs, then clock distribution can be implemented, but clock design complexity increases exponentially due to multi-die, multi-process, and large synchronous domain requirements
Solution Approach 1:
The patent divides the large graphics die into multiple smaller clock domains, each with its own resonant clock source (RTWO). This segmentation allows independent clock generation in each domain, reducing the overall complexity of clock distribution across the entire die while maintaining reliability through localized control.
Solution Approach 2:
The patent introduces a new dimensional approach by using resonant traveling wave oscillators that generate clocks in a resonant manner, adding a temporal resonance dimension to traditional spatial clock distribution. This enables deterministic same-phase clocks across large distances by leveraging resonant frequency alignment rather than traditional hierarchical distribution.
2Manufacturing precision
If clock skew and jitter are reduced to fs order, then deterministic same-phase clocks are achieved, but device complexity increases due to resonant oscillator implementation
Solution Approach 1:
The resonant traveling wave oscillators are designed to self-synchronize through their inherent resonant properties. The RTWOs naturally lock to the same frequency and phase when driven by the reset signal, eliminating the need for complex external phase-locked loop circuits or skew correction mechanisms, thereby achieving fs-order precision without proportionally increasing complexity.
Solution Approach 2:
The patent changes the fundamental operating parameter of clock generation from traditional LC oscillation to resonant mechanical-like oscillation in the electrical domain. By utilizing the resonant frequency of the RTWO structure itself as the defining parameter, the system achieves ultra-low skew and jitter through natural resonance rather than active correction, simplifying the overall control architecture.
3Use of energy by moving object
If low-power clocking is implemented, then power consumption is reduced, but clock signal strength and distribution capability may be compromised
Solution Approach 1:
The resonant traveling wave oscillators generate continuous sinusoidal clock signals that maintain constant amplitude and frequency throughout the distribution network. This continuous resonant action ensures that clock signals retain sufficient strength across large die areas without requiring high initial power levels, as the resonant structure naturally sustains the signal amplitude through its Q-factor.
Solution Approach 2:
The patent employs resonant vibration principles adapted to the electrical domain, where the RTWO structure oscillates at its natural resonant frequency to generate clock signals. This resonant vibration mechanism produces high-amplitude signals with minimal power input, as the resonant structure efficiently stores and releases energy, maintaining signal strength while minimizing power consumption compared to non-resonant oscillators.
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
The proposed solution enables deterministic same-phase clocks across large graphics dies, reducing skew and jitter to the order of fs, and providing a scalable, low-power clocking solution suitable for diverse frequency requirements.
Implementation Method 1
resonant clocking architecture... resonant rotary clocking architectures... rotary traveling wave oscillators (RTWOs)... generate and distribute low-skew, low-jitter, and low-power clocks
Data Source
AI summary
A rotary oscillator array (ROA) apparatus includes a plurality of rotary traveling wave oscillators (RTWOs) configured to generate a plurality of resonant clock signals. An RTWO of the plurality of RTWOs includes a plurality of inverter cells and a fractional divider. The inverter cells are coupled in parallel to each other between two metal interconnects. The fractional divider is coupled to the two metal interconnects. The fractional divider will output a resonant clock signal of the plurality of resonant clock signals based on a reset-out signal generated by a reset-out terminal of the RTWO.