Resonant Clock Distribution Layout for Uniform Phase Synchronization
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Solution Overview
Problem
Current clock distribution systems in computer systems face challenges in providing uniform clock synchronization across multiple circuits, especially at high speeds, due to variations in transmission line lengths and impedance, which can lead to phase and amplitude inconsistencies and higher-order frequency mode interference.
Innovation Solution
A clock distribution resonator system with a main transmission line and branches arranged in a dendritic configuration, where the main line length is an odd multiple of a quarter period and branch lengths are multiples of a half period of the clock signal wavelength, ensuring uniform phase and amplitude delivery to multiple clock distribution networks, while maintaining low impedance and mitigating higher-order frequency modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional clock distribution systems are used to provide clock signals to multiple circuits, then clock distribution can be achieved, but phase and amplitude inconsistencies occur due to variations in transmission line lengths and impedance
Solution Approach 1:
The patent transforms the clock distribution system into a resonant system by carefully selecting transmission line lengths as specific fractions of the clock signal wavelength. The main transmission line is set to an odd multiple of quarter-wavelength (λ/4, 3λ/4, etc.) and branch lines to even multiples of quarter-wavelength (λ/2, λ, etc.), creating a resonant structure that naturally equalizes phase and amplitude across all output paths regardless of physical distance variations.
Solution Approach 2:
The patent applies resonance principles to the electrical transmission lines, causing them to vibrate at their natural resonant frequencies. By designing the transmission line lengths to match specific wavelength fractions, the system creates standing waves that reinforce the clock signal at desired points while canceling out unwanted variations, thereby achieving uniform phase and amplitude distribution.
2Area of stationary object
If transmission lines of different lengths are used to reach spatially separated circuits, then coverage is improved, but higher-order frequency mode interference increases
Solution Approach 1:
The patent controls the physical length parameters of transmission lines to specific wavelength fractions, which fundamentally changes the resonant characteristics of the system. This parameter selection ensures that only the fundamental clock frequency is reinforced while higher-order harmonics are suppressed, allowing spatially separated circuits to be reached without introducing frequency mode interference.
3Manufacturing precision
If uniform clock distribution is achieved through resonator configuration, then phase and amplitude consistency is improved, but transmission line length constraints increase design complexity
Solution Approach 1:
While the patent does specify particular transmission line length parameters (odd multiples of λ/4 for main line, even multiples for branches), this constraint actually simplifies the overall design by providing clear, repeatable fabrication rules. The resonant structure naturally compensates for moderate variations in actual manufactured lengths, making the system robust to typical manufacturing tolerances.
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 system effectively provides synchronized clock signals with uniform phase and amplitude to multiple circuits, even at high speeds, such as ten or more GHz, while minimizing the impact of higher-order frequency modes, ensuring reliable clock synchronization across a large number of spatially separated circuits.
Implementation Method 1
a main transmission line coupled to the clock source to propagate the sinusoidal clock signal
Implementation Method 2
clock distribution resonator system... mitigating the effects of higher-order frequency modes
Data Source
AI summary
One embodiment includes a clock distribution resonator system. The system includes a clock source configured to generate a clock signal having a predefined wavelength, and a main transmission line coupled to the clock source to propagate the clock signal and comprising a first predetermined length defined as a function of the wavelength of the clock signal. The system also includes a plurality of transmission line branches each coupled to the main transmission line to propagate the clock signal. Each of the plurality of transmission line branches includes a second predetermined length different from the first predetermined length. The system further includes a plurality of clock distribution networks coupled to the respective plurality of transmission line branches and being configured to provide the clock signal to each of a plurality of circuits to provide clock synchronization for the associated plurality of circuits.