Resonant Quadrature Clock Distribution With Harmonic Filtering
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Solution Overview
Problem
Existing clock distribution techniques in integrated circuits face challenges such as increased jitter and power consumption due to higher clock frequencies and larger chip sizes, particularly in long-range clock distribution.
Innovation Solution
The proposed solution involves a scalable transmission-line-based resonant clock distribution network using clock distribution units with parallel resonant circuitry for resonant termination, which reduces gain variation and maintains phase-matching across the network. Additionally, harmonic filtering and integrated quadrature clock generation are implemented to improve signal integrity and reduce jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional inductor-capacitor resonant clock distribution networks are used, then clock signal distribution is achieved, but jitter increases and power consumption increases due to higher clock frequencies and larger chip sizes
Solution Approach 1:
The patent transforms the conventional lumped LC resonant network into a distributed transmission-line-based resonant network. This parameter change in the network topology allows the system to operate at higher clock frequencies with reduced jitter and lower power consumption by utilizing the distributed inductance and capacitance of transmission lines rather than discrete lumped components.
Solution Approach 2:
The patent replaces discrete inductor and capacitor components with transmission line structures that inherently provide distributed L and C characteristics. This substitution eliminates the need for separate resonant circuit components and reduces overall power consumption while maintaining resonant clock distribution functionality.
2Length of stationary object
If transmission lines are used for long-range clock distribution, then distribution range is extended, but gain variation and phase variation increase
Solution Approach 1:
The patent utilizes resonant vibration principles by creating a distributed resonant network using transmission lines. The resonant frequency is determined by the distributed L and C parameters of the transmission lines, allowing the network to operate at specific frequencies with enhanced signal stability and reduced gain/phase variation over long distribution ranges.
Solution Approach 2:
The transmission line structure serves multiple functions simultaneously: it acts as both the signal distribution medium and the resonant circuit elements. The distributed inductance and capacitance of the transmission lines provide both signal transmission and frequency-selective resonant characteristics, reducing gain and phase variation across the network.
3Speed
If higher clock frequencies are used to increase bandwidth, then data processing speed is improved, but jitter and power consumption increase
Solution Approach 1:
The patent changes the fundamental parameters of the clock distribution network by transitioning from lumped LC resonators to distributed transmission-line resonators. This parameter change enables the network to support higher clock frequencies with reduced jitter by utilizing the distributed nature of transmission line parameters, which provide better frequency selectivity and signal integrity at high frequencies.
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 provides improved jitter performance, reduced power consumption, and enhanced signal integrity by minimizing amplitude loss and phase variation, while also enabling efficient long-range clock distribution and quadrature clock generation.
Implementation Method 1
a resonant circuit connected to the transmission line segment, the resonant circuit including an inductor connected in parallel with a capacitor, the resonant circuit, along with the transmission line segment, collectively having a resonant frequency about a frequency of the clock signal
Data Source
AI summary
An integrated circuit having a transmission-line-based resonant clock distribution network for distributing a clock signal to one or more nodes, the integrated circuit including a transmission-line-based resonant network formed by one or more clock distribution units. Each clock distribution unit includes a transmission line segment having first and second ends and a resonant circuit connected to the transmission line segment at a position equidistant from the first end and the second end, where the resonant circuit includes an inductor connected in parallel with a capacitor such that the resonant circuit, along with the transmission line segment, collectively has a resonant frequency about a frequency of the clock signal.